JPH1052753A - Joined body between al metal and dissimilar material, and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joined body and its method joining a dissimilar material of a metal or ceramic or the like to an Al metal with high strength and moreover capable of manufacturing at a low cost. SOLUTION: A brazing filler metal foil or brazing filler metal plate having a higher melting point than an Al metal body to be joined is inserted between the dissimilar material body to be joined and Ti metal plate to execute a brazing process. Next, another brazing filler metal foil or brazing filler metal plate having a lower melting point than the Al metal body to be joined is inserted between the Ti metal plate and the Al metal body to be joined to braze both. By this way, the joined body, wherein the dissimilar material body to be joined and the Ti metal plate are mutually joined via the brazing filler metal layer, Ti metal plate and another brazing filler metal layer, is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joined body of an Al-based metal and a dissimilar material and a joining method.

[0002]

2. Description of the Related Art Al-based metals such as Al and Al alloys have advantages of being excellent in corrosion resistance, high thermal conductivity, and being lightweight, and thus have been used in various fields.
In this case, Al-based metals are joined to each other, or an Al-based metal member and a dissimilar metal member mainly containing other than Al are joined to form a composite. As such a joined body of an Al-based metal member and a dissimilar metal member, a joined body using an Al-based low melting point brazing material is known. Also,
As such a low-melting brazing material, Al-Si-based (for example, JISBA4045) as a two-component brazing material, and Al-Cu-Si-based (for example, JISB) as a three-component brazing material.
A4145), Al-Si-Ge system and Al-Si-M
A g-type or the like is used.

[0003]

However, among the above-mentioned joined bodies, Fe, Ni and Co are contained in the dissimilar metal members.
If one or more of
There is a problem that a brittle intermetallic compound is formed by reacting with the Al component in the system metal member, and the bonding strength is reduced. On the other hand, A
There has been a growing demand for not only metal members but also ceramic members to be bonded to l-system metal members. In this case, as a brazing material used for joining, it is originally desirable to use, for example, a noble metal-based brazing material containing an active metal such as Ti, which has excellent reactivity with ceramics. Since these brazing materials cannot be used because of their melting points, the aforementioned Al-based low-melting brazing materials have been used without fail. However, the Al-based low melting point brazing material has poor reactivity with ceramics, and eventually has a problem that sufficient bonding strength cannot be achieved. Prior to joining, there is also a method in which a metallized layer is formed on the surface to be joined of the ceramic member by vapor deposition, sputtering, or the like, and then the joining is performed. In this case, a special processing apparatus such as a vapor deposition apparatus or a sputtering apparatus is used. However, there is a disadvantage that the number of steps is increased and the manufacturing cost is increased.

An object of the present invention is to provide a joined body in which a different material such as metal or ceramic is joined to an Al-based metal with high strength and which can be manufactured at low cost, and a joining method therefor.

[0005]

Means for Solving the Problems and Action / Effects In order to solve the above-mentioned problems, the first structure of the joined body of the present invention is as follows.
Al-based metal joined body mainly composed of
A dissimilar material bonded body made of a metal containing at least one of i and Co as a main component is bonded to each other via a metal-based bonding layer, and the metal-based bonding layer is formed of Al in the Al-based metal bonded body. And Fe, Ni and Co in the dissimilar material joined body
One or more of the components include a diffusion barrier layer that suppresses a reaction based on component diffusion between the Al-based metal bonded body and the dissimilar material bonded body.

An Al-based metal joined body mainly composed of Al;
In a joined body with a dissimilar material joined body made of a metal containing at least one of Fe, Ni, and Co, A
1 and Fe, Ni, Co diffuse into each other, and the fragile Al-Fe, Al-Ni, or Al-Co
Since a brittle intermetallic compound such as a system is formed, the bonding strength is low. However, in the bonded body according to the first configuration of the present invention, the metal-based bonding layer includes a diffusion barrier layer, and the diffusion barrier layer diffuses Al and Fe, Ni or Co, and the diffusion barrier layer includes the diffusion barrier layer. Since the reaction is hindered, the formation of the fragile intermetallic compound is suppressed, and a high-strength joined body can be obtained.

[0007] A joining method of the present invention for obtaining the joined body having the first configuration is characterized by including the following steps. Diffusion barrier metal layer forming step: The Al component in the Al-based metal bonded object and one or more of the Fe, Ni, and Co components in the heterogeneous material bonded object are bonded to the bonding surface of the different material bonded object. Forming a diffusion barrier metal layer to be a diffusion barrier layer for suppressing a reaction based on bidirectional or one-way component diffusion between the Al-based metal bonded body and the dissimilar material bonded body. I do. Bonding step: The Al-based metal bonded body is bonded to the formed diffusion barrier metal layer directly or indirectly via another layer from the side opposite to the heterogeneous material bonded body.

Thus, it is possible to efficiently manufacture the joined body according to the first configuration of the present invention. Here, in the above method, the diffusion barrier metal layer becomes a diffusion barrier layer after bonding.

The diffusion barrier metal layer can be formed by, for example, vapor deposition, vapor deposition such as sputtering, or chemical plating. In addition, a metal plate made of a metal having a predetermined composition can be formed by brazing to a bonding surface of a dissimilar material bonded body by brazing. On the other hand, as a method for joining the Al-based metal article to the diffusion barrier metal layer, for example, brazing can be adopted. In this case, various types of Al alloy brazing can be used as the brazing material used for joining, for example, Al-Si based (JIS: BA4343, BA
4045 etc.), Al-Cu-Si type (JIS: BA41)
45), an Al-Cu-Mg type (JIS: BA400)
3, BA4004, BA4005, BA4N04, etc.),
Further, Al-Mg, Al-Si-Ge, Al-S
i-Mg system, Al-Si-Cu-Zn system, Al-Ge-
A brazing material such as Si-Cu-Mg can be used. Note that, instead of brazing, diffusion bonding using no brazing material, friction welding, explosive welding, resistance welding, hot pressing, or the like may be employed.

[0010] In the joined body according to the first configuration of the present invention, the material of the joined body of different materials may be, specifically,
Chromium molybdenum steel, stainless steel, Ni-base heat-resistant alloy (for example, brand name: Inconel), Fe-Ni-Co alloy (for example, Kovar), Fe-Ni alloy (for example, 42 alloy), WC-Co, TiN-Co, WC-Ni
And the like.

On the other hand, as the material of the Al-based metal joined body, pure Al (which may contain unavoidable impurities) or various Al alloys can be used. Specifically, industrial pure Al (JIS: 1050, 1060, 1080,
1100 etc.), Al alloy for casting (JIS: AC1A, A
C1B, AC2A, AC2B, AC3A, AC4A, A
C4B, AC4C, AC4CH, AC4D, AC5A,
AC7A, AC7B, AC8A, AC8B, AC8C,
AC9A, AC9B, etc.), Al alloy for die casting (J
IS: ADC1, ADC3, ADC5, ADC6, AD
C10, ADC12, etc.), Al-Cu-Mg wrought alloy (JIS: 2014, 2017, 2024, etc.), Al
-Mn-based wrought alloy (JIS: 3003, 3004
Etc.), Al-Si based wrought alloys (JIS: 4032, 4
043 etc.), Al-Mg based wrought alloy (JIS: 500
5, 5052, 5083, 5086, etc.), Al-Mg-
Si-based wrought alloys (JIS: 6061, 6063, etc.),
Al-Zn-Mg-Cu-based or Al-Zn-Mg-based alloys for spreading (JIS: 7075, 7N01, etc.), and further, Al-Li-based alloys and the like can be exemplified.

Also, an Al-based dispersion-reinforced composite material in which ceramic particles such as Al ₂ O ₃ are dispersed in an Al-based metal substrate, and a precursor fiber made of carbon, SiC, Al ₂ O _3, etc. B / W, B ₄ C / B / W, SiC /
B / W, CVD fibers such as SiC / C, metal fibers such as W, Mo, steel, whisker fibers such as SiC, Si ₃ N ₄ , Al ₂ O ₃ , graphite, potassium titanate, etc. A fiber-reinforced composite material reinforced with a reinforcing fiber body can also be used.

Next, the diffusion barrier layer is made of, for example, Ti, Pd.
And Pt. Specifically, the diffusion barrier layer can be configured as at least one of a layer mainly composed of Ti, a layer mainly composed of Pd, and a layer mainly composed of Pt. In this case, for example, only a single layer of Ti, Pd, and Pt may be used, or a plurality of these layers may be combined. For example, different types of layers may be stacked, such as a Ti layer and a Pd layer, a Ti layer and a Pt layer, a Pd layer and a Pt layer, or a Ti layer, a Pd layer, and a Pt layer. For example, Ti
A plurality of layers of the same type, such as three layers of a layer, a Pd layer, and a Ti layer, or four layers (or more layers) of a Ti layer, a Pd layer, a Ti layer, and a Pt layer may be included and combined. Also, T
Instead of i, Pd, and Pt, an alloy containing them as a main component may be used.

The diffusion barrier layer is made of Ti, Pd and P.
You may comprise as what has at least any one of t as a main component. In this case, the diffusion barrier layer may be present, for example, as an alloy layer of two or three different substances, or a mixed layer of two or more different substances (eg, (A layer in which other substances are slightly mixed). In any case, T
By forming the diffusion barrier layer containing at least one of i, Pd, and Pt as a main component, the Al component in the Al-based metal bonded body and the F component in the heterogenous bonded body are separated.
It becomes possible to effectively suppress the diffusion with one or more of the e, Ni and Co components and the reaction caused thereby.

[0015] The effect of suppressing the diffusion or reaction of the above components is enhanced as the thickness of the diffusion barrier layer is increased, whereby the above-mentioned fragile intermetallic compound is less likely to be formed at the joint interface. Strength tends to be higher. In this case, when the thickness of the diffusion barrier layer is 2 μm or more, at least the strength of the joined body can be secured to a necessary and sufficient value. The thickness of the diffusion barrier layer is
More preferably, the thickness is 5 μm or more. On the other hand, if the thickness of the diffusion barrier layer exceeds 10 μm, it is no longer possible to expect an increase in bonding strength with a further increase in the thickness of the barrier layer. Therefore, the thickness of the diffusion barrier layer is limited to a range of 10 μm or less. It can be said that adjustment is desirable.

The thickness of the diffusion barrier layer referred to herein is, as shown in FIG. 1, between the Al-based metal bonded body and the dissimilar material bonded body on one side of the diffusion barrier layer. A layer is defined as an A layer, and a layer adjacent to the other side is defined as a B layer. The thickness of the remaining portion excluding the portions C and D which cause diffusion between the A layer and the B layer is defined as (Hence the thickness after joining, of course). In addition, the diffusion barrier layer, the portions where diffusion occurs on both sides thereof, the Al-based metal bonded body, and the foreign material bonded body can be formed by a known method, for example, an electron probe microanalyzer (EPMA: or a scanning electron microscope). Combination with observation image), energy dispersive X-ray analysis (EDX), wavelength dispersive spectroscopy (W
DS), Auger electron spectroscopy (AES), and the like, based on which the thickness of the diffusion barrier layer can be easily measured.

In the joined body having the first configuration, the Al-based metal joined body and the dissimilar material joined body are provided between
A buffer layer for reducing thermal residual stress may be provided. In this case, the buffer layer can be arranged at least between the Al-based metal bonded body and the diffusion barrier layer and between the diffusion barrier layer and the heterogenous bonded body.

Next, the second structure of the joined body of the present invention is as follows.
1 and a dissimilar material joined body made of a different material are joined to each other via a metal-based joining layer, and the metal-based joining layer is , A Ti-based metal layer composed of Ti or a Ti alloy and arranged on the Al-based metal bonded body side, and formed between the Ti-based metal layer (for example, a Ti-based metal plate) and a bonded body of a different material. And a brazing material layer for joining them to each other.

According to the above structure, the Al-based metal bonded body and the hetero-material bonded body can be firmly bonded by the Ti-based metal layer brazed to the heterogenous bonded body.
The dissimilar material joined body may be made of metal or ceramic. For example, when the dissimilar material is metal, in the structure of the conventional bonded body, a fragile intermetallic compound may be formed at the bonding interface and the bonding strength may not be secured. A reaction between the Al-based metal and the dissimilar material can be hindered by interposing the Ti-based metal layer between the dissimilar material joined body by brazing and joining them through the Ti-based metal layer, As a result, a high-strength joined body in which the formation of the intermetallic compound is suppressed is realized. Also, when the dissimilar material is ceramic, it is possible to obtain a joined body having enhanced joining strength due to the interposition of the Ti-based metal layer and the brazing material layer.

Further, the joining method of the present invention for obtaining the above-mentioned joined body is characterized by including the following steps. Brazing step: A Ti-based metal layer is previously brazed and joined to a surface to be joined of a dissimilar material joined body with a brazing material. Joining step: A for the brazed Ti-based metal layer
The 1-based metal bonded body is bonded directly from the opposite side to the heterogeneous material bonded body or indirectly through another layer.

According to the method, since the Ti-based metal layer is brazed to the dissimilar material to be joined before the joining of the Al-based metal to-be-joined object, the Ti-based metal layer is brazed regardless of the melting point of the Al-based metal. The attachment temperature can be set freely. Therefore, it is possible to use a high melting point brazing material from the viewpoint of improving the bonding strength. For example, when the dissimilar material is ceramic, a Ti-based metal layer is formed using a high melting point brazing material (described later) suitable for ceramic bonding. Can be joined to this. Once the Ti-based metal layer has been bonded to the dissimilar material bonded body, the Al-based metal bonded body can be bonded to the Ti-based metal layer at a relatively low temperature and high strength by a method described later. Since it is possible, as a result, a metallizing process using a special device such as a vapor deposition device or a sputtering device is not required, and a high-strength bonded body can be manufactured at low cost.

As described above, the brazing material layer for joining the Ti-based metal layer to the dissimilar material to be bonded is made of an Al-based metal to be joined, as exemplified in the case where the dissimilar material to be joined is made of ceramic. It can be made of a material having a higher melting point than the body.

In the joined body of the second structure of the present invention, when the joined body of different materials is made of a metal material, the material may be various iron-based materials such as mild steel and stainless steel, Cu, Metals containing any of Ni, Co, Be and Zr as main components (including both simple metals and alloys)
Etc. can be used. In particular, when a material containing Fe, Ni and Co is used, the Ti-based metal layer has an Al component in the Al-based metal bonded body and a One or more of the Fe, Ni, and Co components function as a diffusion barrier layer that suppresses a reaction based on component diffusion between the Al-based metal bonded body and the dissimilar material bonded body. As a result, the formation of an intermetallic compound between these components and Al, which has been a problem in the past, is reduced to Ti
Since it is effectively prevented by the interposition of the system metal layer, the ripple effect in obtaining a high-strength joined body is particularly large.

As the metal containing at least one of Fe, Ni and Co as the main component, chromium molybdenum steel, stainless steel, Ni-base heat-resistant alloy (for example, trade name: Inconel), Fe -Ni-Co alloy (e.g., Kovar), Fe-Ni alloy (e.g., 42 alloy), and sintered metals such as WC-Co, TiN-Co, and WC-Ni. Further, when the dissimilar material joined body is made of ceramic, the material may be Al ₂ O ₃ , ZrO.
₂ , various types such as Si ₃ N ₄ , AlN, SiC, TiC and the like can be used.

On the other hand, as the material of the Al-based metal bonded body, the same material as that of the bonded body having the above-described first configuration can be used, and the description is omitted.

Next, the Ti-based metal layer only needs to be composed mainly of Ti, for example, industrial pure Ti (for example, J
IS H4600), Ti-Pd alloy (for example, JIS
H4605), Ti-6Al-4V alloy (for example, JIS
H4607, composition is% by weight: Hereinafter, in the present specification, all the composition values are represented by% by weight, and the indication of "% by weight" is omitted), and various other Ti alloys can be used. Note that the thickness of the Ti-based metal layer is preferably 0.1 mm or more. If the thickness is less than 0.1 mm, the Ti-based metal layer may warp due to thermal stress or the like during brazing, and the bonding strength when the Al-based metal workpiece is later bonded may be reduced. The thickness of the Ti-based metal layer is preferably 0.2 mm
It is better to set above. Here, as shown in FIG. 1, the thickness of the Ti-based metal layer is the same as that of the diffusion barrier layer in the first configuration. A layer adjacent to one side of the base metal layer is referred to as an A layer, and a layer adjacent to the other side is referred to as a B layer, and a portion where diffusion occurs between the A layer and the B layer is removed. It refers to the thickness of the remaining part. That is, also in this case, it means the thickness after bonding.

Further, as a brazing material for brazing a Ti-based metal layer to an object to be joined of different materials, Ag-based, Ni-based,
Various brazing materials such as Cu-based, Ag-Cu-based, Ni-Cu-based,
An active brazing material obtained by adding an active metal component such as Ti, Zr, or Hf to the composition of these brazing materials can be used. In the latter case, the active metal component plays a role in increasing the wettability between the surface of the dissimilar material and the brazing material, and as a result, the joining strength between the joined body of the dissimilar material and the Ti-based metal layer is further increased.
On the other hand, even when the former brazing material containing no active metal component is used, the Ti component in the Ti-based metal layer can be eluted and diffused into the liquid phase generated by the melting of the brazing material during the brazing process. is there. In this case, the diffused Ti component functions as an active metal component, and the bonding strength between the dissimilar material-joined body and the Ti-based metal layer may be similarly increased.

In the case where the dissimilar material to be joined is made of ceramics, it is desirable that the brazing material layer after joining contains, for example, Ti in order to enhance the wettability between the ceramics and the brazing material. It can be said that. In this case, the contained Ti component is one derived from the Ti-based metal layer, one derived from the Ti component originally contained in the active brazing material, or one composed of both. The Ti component in the brazing material layer can be determined by a known method, for example, an electron probe microanalyzer (EPMA: or a combination with an image observed by a scanning electron microscope), energy dispersive X-ray analysis (EDX), and wavelength dispersive spectroscopy (EDX). WDS), Auger electron spectroscopy (AES) and the like. It should be noted that Ti derived from the Ti-based metal layer is contained in the brazing material layer.
If a component is contained, the joining direction (ie, thickness direction) near the boundary between the brazing material layer and the Ti-based metal layer
In some cases, a transition region where the Ti component content gradually decreases from the Ti-based metal layer side toward the brazing material layer side may be formed.

Next, with respect to the Ti-based metal layer brazed to the dissimilar material joined object, the Al-based metal joined object can be brazed and joined via another brazing material layer. In this case, as the material of the other brazing material, a material having a lower melting point than the Al-based metal joined body can be used. Specifically, for example, for example, an Al-Si system (JIS: BA4343, BA4045)
Etc.), Al-Cu-Si system (JIS: BA4145)
Etc.), Al-Cu-Mg type (JIS: BA4003, B
A4004, BA4005, BA4N04, etc.), Al-Mg, Al-Si-Ge, Al-Si-M
g-based, Al-Si-Cu-Zn-based, Al-Ge-Si-
Various Al-based brazing materials such as Cu-Mg-based materials can be used.

As described above, in the conventional joined body, A
When joining a ceramic member to an l-based metal member,
Where a high melting point brazing material is originally desired to be used, Al-based low melting point brazing material must be used unavoidably due to the limitation of the melting point of the Al-based metal member, and as a result, sufficient bonding strength cannot be achieved. However, as described above, the brazing bonding between the Ti-based metal layer and the object to be bonded of the dissimilar material,
And the brazing of the Al-based metal article to the base metal layer is sequentially performed in this order, and in the former, a high melting point brazing material is used, and in the latter, a low melting point brazing material is used. Such a problem was solved, and it became possible to easily obtain a joined body having excellent strength.

In the joined body having the second configuration, thermal residual stress is also generated between the joined body of different materials and the Ti-based metal layer or between the Ti-based metal layer and the Al-based metal joined body. You may provide the buffer layer which softens.

The joining of the Al-based metal article to the Ti-based metal layer may be performed by brazing, diffusion welding without using a brazing material, friction welding, or explosion welding. When the dissimilar material joined body is made of a metal material, joining by resistance welding is also possible.

In each of the joined bodies of the first and second constructions of the present invention described above, if the Al-based metal joined body is made of an age-precipitation hardening type Al alloy, the joining process can be performed, for example, by brazing. For example, a heating process for heating to a predetermined joining temperature or the like, the heating process can be applied to the solution treatment of the Al-based metal workpiece. In this case, by performing aging treatment at a lower temperature (including room temperature) than the heat treatment temperature (that is, the solution treatment temperature) for a predetermined time after joining, the Al-based metal joined body is precipitated and hardened, thereby increasing its strength. Can be. In addition, aging precipitation hardening type Al
As the alloy, for casting or die casting, Al-Cu-Mg alloy (JIS: AC1A, AC1B)
Etc.), Al-Cu-Mg-Ni system (JIS: AC5A)
Etc.), Al-Cu-Si system (JIS: AC2A, AC2
B, etc.), Al-Si-Mg type (JIS: AC4A, AC
4C, AC4CH, ADC3, etc.), Al-Si-Cu type (JIS: AC4B, ADC10, ADC12, etc.), A
1-Si-Mg-Cu (JIS: AC4D, etc.), Al
-Si-Mg-Ni-based (JIS: AC8A, AC8B,
In the case of various alloys such as AC8C, AC9A, AC9B, and the like for spreading, Al-Cu-Mg (JIS: 2014,
2017, 2024 etc.), Al-Si-Cu-Mg type (JIS: 4032 etc.), Al-Mg-Si type (JI
S: 6061, 6063, etc.), Al-Zn-Mg-Cu
System or Al-Zn-Mg system (JIS: 7075, 7
N01) and various Al-Li alloys.

[0034]

Embodiments of the present invention will be described below. FIG. 2 is a schematic diagram illustrating an example of the first configuration of the joined body of the present invention. A bonding layer made of a brazing material and a diffusion barrier layer are formed in this order between the Al-based metal bonded body and the dissimilar material bonded body from the Al-based metal bonded body side. It should be noted that there are portions where diffusion occurs as shown in FIG. 1 on both sides (up and down directions in the figure) of the diffusion barrier layer, but this is omitted in FIG.

The Al-based metal joined body is a member made of a metal containing Al as a main component (ie, Al or an Al alloy), and the dissimilar material joined body is a metal containing at least one of Fe, Ni, and Co. It is a member which consists of. On the other hand, the brazing material forming the joining layer is, for example, an Al-based low melting point brazing material, and a joined body is formed by brazing by the joining layer. The diffusion barrier layer is a layer containing one or more of Ti, Pd, and Pt, and has a thickness of, for example, 2 μm or more.

In the case of manufacturing such a joined body, first, a metallized film (such as a diffusion barrier layer) of Ti or the like to be a diffusion barrier layer is formed on the joining surface of the dissimilar material to be joined by a method such as plating, vapor deposition, or sputtering. A metal layer) is formed in advance, and a foil made of a brazing material serving as a bonding layer is sandwiched between the formed diffusion barrier metal layer and the Al-based metal bonded body. Then, in this state, joining by brazing is performed by heating to a temperature equal to or higher than the melting temperature of the brazing material. Note that, here, a metallized film was used to form the diffusion barrier layer,
A foil such as Ti serving as a diffusion barrier layer may be arranged and sandwiched between the dissimilar materials to be bonded.

FIG. 3 shows an example of a joined body provided with a buffer layer. In this configuration, a bonding layer made of a brazing material, a buffer layer made of a metal containing Al as a main component, and a brazing material are provided between the Al-based metal bonded body and the bonded body of a different material mainly composed of Fe. The second bonding layer and the diffusion barrier layer are formed in this order from the Al-based metal bonded body side. Since this joined body is provided with a buffer layer at the joining interface, it is advantageous when the thermal expansion coefficient difference between the Al-based metal joined body and the dissimilar material joined body is large.

Next, FIG. 4A is a schematic view showing an example of the second structure of the joined body of the present invention. That is, in the joined body, the dissimilar material joined body and the Ti-based metal plate as the Ti-based metal layer are joined to each other via the brazing material layer, the Ti-based metal plate, and another brazing material layer. Similar to the first configuration, the Al-based metal joined body is a member made of a metal containing Al as a main component (Al or an Al alloy), and the dissimilar material joined body includes one or more of Fe, Ni, and Co. And a ceramic member. The Ti metal plate is made of pure Ti for industrial use, Ti-Pd alloy or Ti-
6Al-4V alloy or the like. Furthermore, a brazing material for brazing a Ti-based metal plate to a dissimilar material joined body is as follows:
Various brazing materials such as Ag-based, Ni-based, Cu-based, Ag-Cu-based, Ni-Cu-based, or Ti,
It is an active brazing material to which active metal components such as Zr and Hf are added. On the other hand, another brazing material for brazing a Ti-based metal plate to an Al-based metal workpiece is, for example, an Al-based low melting point brazing material. It should be noted that there are portions where diffusion occurs as shown in FIG. 1 on both sides (up and down directions in the figure) of the diffusion barrier layer, but these are omitted in FIGS. 2 to 4.

FIG. 5 shows an example of a method of manufacturing the joined body in that case.
Is schematically shown in FIG. That is, as shown in FIG. 1A, a brazing material foil or a brazing material plate (for example, a material having a higher melting point than an Al-based metal material to be described later) is provided between a different material material to be bonded and a Ti-based metal plate. , And in this state, the brazing treatment is performed by heating to a predetermined temperature higher than the melting point of the Al-based metal joined body. Thus, as shown in FIG. 2B, the dissimilar material joined body and the Ti-based metal plate are joined via the brazing material layer. Then, another brazing material foil or brazing material plate is interposed between the Ti-based metal plate and the Al-based metal bonded body, and heated to a predetermined bonding temperature lower than the melting point of the Al-based metal bonded body. And braze them together.

As shown in FIGS. 4 (b) and 4 (c), heat is applied between the object to be joined of different materials and the Ti-based metal plate or between the Ti-based metal plate and the Al-based metal object to be joined. A buffer layer for reducing residual stress may be provided. When the dissimilar material to be joined is, for example, ceramic, as shown in FIG.
The cushioning plate is made of a ceramic dissimilar material and Ti
It is arranged between the system metal plate. In this case, the buffer plate can be made of, for example, Ni or a Ni alloy. Further, as a brazing material (brazing material for joining a buffer plate) for joining such a buffer plate to a ceramic-made dissimilar material to-be-joined body, Ag-based, Ni-based, Cu-based, Ag-Cu-based, Ni- C
An active brazing material obtained by adding an active metal component such as Ti, Zr, or Hf to a brazing material composition such as a u-based brazing material can be used. In this case, FIG.
As shown in (a), first, a buffer plate and a Ti-based metal plate are joined to a dissimilar material joined body via a buffer plate joining brazing material layer and the above-mentioned brazing material layer, respectively. The Al-based metal workpiece is joined using another brazing material.

On the other hand, when the dissimilar material to be joined is made of metal, as shown in FIG.
It is arranged between the i-based metal plate and the Al-based metal workpiece. In this case, the buffer plate can be made of, for example, a metal mainly containing Al. Further, as a brazing material for joining such a buffer plate to an Al-based metal workpiece (a brazing material for joining a buffer plate), for example, an Al-based low melting point brazing material can be used. In this case, as shown in FIG. 6B, a Ti-based metal plate is joined to the dissimilar material to be joined via the brazing material layer described above, and the buffer plate and the Al-based metal to-be-joined are joined to this. And the above-mentioned another brazing material and the brazing material for joining the buffer plate.

[0042]

Embodiments of the present invention will be described below. (Example 1) The joined body shown in FIG. 2 was produced by brazing using the following materials in various combinations shown in Table 1 (Sample Nos. 1 to 17). (1) Al-based metal joined body: Al casting (AC2A), pure A
1 (Al050), Al-Cu alloy (A2017), A
Four types of I-Zn-Mg alloy (A7075) were used.
The size is 10.5 mm in diameter and 20 mm in length. (2) Dissimilar materials to be joined: Fe-29Ni-17Co, carbon steel (S20C; Fe-0.2C) was used. The size is 10.5 mm in diameter and 20 mm in length. (3) Bonding layer: Al-10Si (BA40
45), Al-27Cu-5Si, Al-14Cu-3
Thickness 5 made of three low melting point brazing materials of Si-80Zn
A 0 μm brazing material foil was used. (4) Metal layer for diffusion barrier: Metallized layer formed by various methods and materials. Table 1 shows the formation method and thickness, and the composition of the diffusion barrier layer after bonding. The thickness of the diffusion barrier layer was measured by EPMA after bonding, and the numerical value is shown on the right side of the element symbol in each column. In addition, the two-layer No. In the configuration of the 13 diffusion barrier layers, the layer shown on the left side of the table was disposed on the side of the dissimilar material to be bonded, and the layer also shown on the right side was disposed on the side of the Al-based metal to-be-bonded. Also, N
o. The mixed layer of No. 14 is a layer in which 20% by weight of Al is mixed in Ti. The mixed layer of 16 has A in Pd.
1 means a layer in which 20% by weight is mixed.

[0043]

[Table 1]

Then, a four-point bending test was performed on the obtained joined body to measure its joining strength. The results are also shown in Table 1. In addition, the same experiment was performed about the comparative example (sample No. 18-22). Here, "not joined" means
Means those obtained before the four-point bending test, such as those obtained by hand.

As is clear from Table 1, the four-point bending strength of this example (Sample Nos. 1 to 17) was 35 MPa.
It is a preferable high-strength bonded body having a bonding strength of a or more. Particularly, when the diffusion barrier layer is 2 μm or more (sample N
o. 5 to 17) have a four-point bending strength of 75 Mpa or more, which is preferable. Further, those having a diffusion barrier layer of 5 μm or more (Sample Nos. 9 to 17) have a four-point bending strength of 140 Mpa.
It is much larger and more preferable. In contrast,
Comparative examples outside the scope of the present invention (Sample Nos. 18 to 22)
In this case, a joined body cannot be formed, or the strength is low so that it can be easily removed by hand even when joined.

(Example 2) A member to be joined of different materials (diameter 1
Carbon steel (JIS S20C, composition: Fe-0.2C), brass (JIS C2801, composition: Cu-40Zn), Al
4 types of ₂ O ₃ sintered body and Si ₃ N ₄ sintered body
As a system metal plate (disc-shaped with a diameter of 10.5 mm, thickness is described in Table 2), industrial pure Ti and Ti alloy (Ti-6A)
1-4V). The brazing material (10.5 mm in diameter, 20 mm in thickness) for joining them
In consideration of the bondability with the above-mentioned different materials, an Ag-Cu eutectic solder (composition: Ag-28Cu and A
g-28Cu-4Ti) and three types of Ag-Cu-Ti brazes (composition: Ag-35Cu-2Ti). On the other hand, an A1-based metal joined body (diameter 10.5 mm, thickness 20
mm disk) is industrial pure Al (JIS 10
50), casting Al alloy (JIS AC2A), wrought Al-Cu-Mg alloy (JIS 2017), and Al
Three kinds of -Zn-Mg-Cu alloy (JIS 7075) were prepared. Further, as another brazing material for joining the A1-based metal joined body to the Ti-based metal plate, an Al-Cu-Si-Zn-based brazing material (composition: Al-
12Cu-2Si-56Zn).

These were joined in the combinations shown in Table 1 by the method shown in FIG. In addition, the joining between the dissimilar material joined body and the Ti-based metal plate is performed using Ag-28C as a brazing material.
u was used at a temperature of 830 ° C. and Ag-35Cu
-2Ti is 900 ° C., and the joining between the Ti-based metal plate and the Al-based metal workpiece is 520 ° C.
Each was performed in a vacuum. The joined body thus obtained is subjected to cylindrical grinding so as to have an outer diameter of 9 mm, and a cantilever bending load is applied to the side of the Al-based metal joined body to apply a cantilever bending load to the joined side of the dissimilar material joined body. The strength was evaluated. The results are shown in Table 2 (in the table, "*" indicates a comparative example).

[0048]

[Table 2]

That is, the joined bodies (Nos. 1-2 of the examples)
Regarding 8), it can be seen that each of them shows high strength of 100 MPa or more. On the other hand, the comparative examples (Nos. 29 to 36) using a pure Ni plate or a Ni-30Mo plate instead of the Ti-based metal plate show intermetallic compounds fragile due to the problem of the Al-based metal joined body and the low melting point solder. Was formed, so that the strength was low. The joined bodies of Comparative Examples 33 and 34 were made of Ti.
Since the thickness of the system-based metal plate is small, the Ti-based metal plate warps due to thermal stress or the like when brazing to a dissimilar material to-be-joined, and the joining strength is similarly reduced. Further, in Comparative Example 35 in which the Al-based metal joined body and the carbon steel were directly joined using a low-melting brazing without using a Ti-based metal plate, the carbon steel and the low-melting braze reacted. A brittle intermetallic compound was formed, and the bonding strength was extremely reduced, so that the strength could not be measured. In Comparative Example 36 in which Al ₂ O ₃ was used instead of carbon steel, Al ₂ O ₃ did not react with the low melting point brazing alloy, and a joined body could not be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a main part of a joined body of the present invention.

FIG. 2 is a schematic view showing an example of a joined body according to the first configuration of the present invention.

FIG. 3 is a schematic view showing a modified example of the joined body of FIG. 2;

FIG. 4 is a schematic view showing a joined body according to a second configuration of the present invention together with some modified examples thereof.

FIG. 5 is a conceptual diagram showing a method for manufacturing the joined body of FIG. 4 (a).

FIG. 6 is a conceptual diagram showing a method for manufacturing the joined body of FIGS. 4B and 4C.

Claims (14)

[Claims] 1. An Al-based metal bonded body mainly composed of Al and a dissimilar material bonded body made of a metal mainly containing at least one of Fe, Ni and Co via a metal-based bonding layer. And the metal-based bonding layer is formed of Al in the Al-based metal bonded body.
And Fe, Ni, and Co in the dissimilar material joined body.
An Al-based metal, characterized in that the Al-based metal comprises a diffusion barrier layer that suppresses a reaction based on component diffusion between the Al-based metal joined body and the dissimilar material-joined body. Joints with dissimilar materials. 2. The method according to claim 1, wherein the diffusion barrier layer comprises Ti, Pd and P.
2. The Al according to claim 1, containing at least one of t.
A joined body of a base metal and a different material. 3. The Al-based diffusion barrier layer according to claim 2, wherein the diffusion barrier layer comprises at least one of a layer mainly composed of Ti, a layer mainly composed of Pd, and a layer mainly composed of Pt. A joint of metal and dissimilar materials. 4. The joined body of an Al-based metal and a dissimilar material according to claim 1, wherein the thickness of the diffusion barrier layer is 2 μm or more. 5. An Al-based metal bonded body mainly composed of Al and a dissimilar material bonded body composed of a different material from each other are bonded to each other via a metal-based bonding layer. A metal-based bonding layer is formed of Ti or a Ti alloy, and is formed between the Ti-based metal layer disposed on the Al-based metal bonded body and the Ti-based metal bonded body. A joined body of an Al-based metal and a dissimilar material, characterized in that the joined body includes a brazing material layer that is joined to each other. 6. The dissimilar material bonded object is made of a metal containing at least one of Fe, Ni and Co as a main component, and the Ti-based metal layer is made of A in the Al-based metal bonded object.
l component, and Fe, Ni and C in the dissimilar material joined body.
6. The element according to claim 5, wherein at least one of the o components functions as a diffusion barrier layer that suppresses a reaction based on component diffusion between the Al-based metal joined body and the dissimilar material joined body. Of Al-based metal and dissimilar materials. 7. A joined body of an Al-based metal and a dissimilar material according to claim 5, wherein said dissimilar material joined body is made of ceramics, and said brazing material layer contains Ti. 8. The brazing material layer for joining the Ti-based metal layer to the dissimilar material-joined body is made of a material having a higher melting point than the Al-based metal-joined body. The Al-based metal joined body is
The joined body according to any one of claims 5 to 7, wherein the joined body is joined via another brazing material layer having a lower melting point than the l-based metal joined body. 9. The joined body according to claim 1, wherein said Al-based metal joined body is made of an aging precipitation hardening type Al alloy. 10. A method for bonding an Al-based metal bonded body mainly composed of Al and a heterogenous bonded body made of a metal mainly containing at least one of Fe, Ni and Co to each other. With respect to the joining surface of the dissimilar material joined object, the Al component in the Al-based metal joined object and the F component in the dissimilar material joined object
Diffusion to be a diffusion barrier layer for suppressing reaction of one or more of e, Ni and Co components based on component diffusion between the Al-based metal bonded body and the heterogeneous material bonded body. A diffusion barrier metal layer forming step of forming a barrier metal layer, and for the formed diffusion barrier metal layer, the Al-based metal bonded body is directly or directly connected to the heterogeneous material bonded body from the opposite side. A method of manufacturing a joined body of an Al-based metal and a dissimilar material, comprising a joining step of indirectly joining via another layer. 11. A method for joining an Al-based metal joined body mainly composed of Al and a dissimilar material joined body composed of a different material to each other, comprising: A brazing step of pre-brazing and joining the Ti-based metal layer to the surface to be joined with a brazing material, and the above-mentioned Al-based metal joined body with respect to the brazed Ti-based metal layer, A joining step of joining directly from the opposite side or indirectly via another layer, and a method for producing a joined body of an Al-based metal and a dissimilar material. 12. A brazing material layer is formed between the dissimilar material bonded object and the Ti-based metal layer by the brazing, and a part of a Ti component in the Ti-based metal layer is removed. The Ti component diffused in the brazing material layer, and the Ti component diffused in the brazing material layer is used as an active metal component for joining the Ti-based metal layer and the dissimilar material bonded body via the brazing material layer. The method for manufacturing a joined body according to claim 11, wherein the joined body is made to function. 13. The method according to claim 13, wherein in the brazing step, the Ti
The system-based metal layer is joined to the dissimilar material-to-be-joined by a brazing material having a higher melting point than the Al-based metal-to-be-joined. The method for manufacturing a joined body according to claim 11 or 12, wherein the joined body is joined with a brazing material having a lower melting point than the Al-based metal joined body. 14. The Al-based metal joined body is made of an aging precipitation hardening type Al alloy, and is subjected to a solution treatment by being heated to a predetermined joining temperature in the joining step. 3. The method for producing a joined body according to item 1.