JP4107553B2 - Brazing composite material and brazing product using the same - Google Patents

Description

【００５６】
次に、各複合材について、基材であるステンレス鋼条材の被侵食の割合（侵食された割合）、耐腐食性、ろう材の濡れ性、及びろう付け生産性（作業性）について評価を行った。各種の評価結果を表２に示す。
【００５７】
ここで、被侵食の割合の評価は、各複合材を真空炉中で最高で１１５０℃に加熱して、ろう付け層を溶融させた後、各複合材の断面を観察し、基材であるステンレス鋼条材の板厚残存率（熱処理後の板厚×１００／熱処理前の板厚（％））を測定することによって行った。耐腐食性の評価は、塩素イオン、硝酸イオン、及び硫酸イオンを含んだ腐食性溶液中に、各複合材を１０００時間浸漬して腐食試験を行い、その後、各複合材を溶液中から取出してろう付け部の組織観察を行い、腐食発生の有無を調べることによって行った。濡れ性の評価は、各複合材のろう付け層の表面にＳＵＳ３０４からなるステンレス鋼パイプを乗せ、真空炉中で最高で１１５０℃に加熱してろう付けを行った後の、ろう付け部のフィレット（面取り）形状によって評価を行った。
【００５８】
【表２】

【００５９】
表２に示すように、本発明に係るろう付け用複合材である実施例１〜４の複合材は、ろう付け層を、Ｆｅ、Ｔｉ、及びＮｉを含むろう材で形成し、かつ、ろう付け層全体に占めるＦｅの割合が規定範囲（１０〜５０ｍａｓｓ％）内であるため、基材の板厚残存率がそれぞれ９７，９３，９６，９７（％）といずれも高かった。また、耐腐食性、濡れ性、及びろう付け生産性についても、いずれも良好であった。
【００６０】
これに対して、比較例１の複合材は、耐腐食性、濡れ性、及びろう付け生産性はいずれも良好であったものの、ろう付け層全体に占めるＦｅの割合が規定範囲外の５ｍａｓｓ％であるため、基材の板厚残存率は８０％であり、被侵食の割合がやや高かった。
【００６１】
比較例２の複合材は、基材の板厚残存率が９８％と高く、かつ、耐食性及びろう付け生産性はいずれも良好であったものの、ろう付け層全体に占めるＦｅの割合が規定範囲外の５５ｍａｓｓ％と高く、即ちＮｉ及びＴｉの割合が低いため、濡れ性が不良であった。
【００６２】
比較例３，４の複合材は、耐腐食性、濡れ性、及びろう付け生産性はいずれも良好であった。しかし、比較例４の複合材は、ろう付け層がＮｉ及びＴｉろう材で形成され、Ｆｅろう材を含んでいないため、基材の板厚残存率は７８％であり、被侵食の割合が高かった。また、比較例３の複合材は、ろう付け層がＮｉ及びＴｉろう材で形成され、即ちＦｅろう材を含んでいないと共に、ステンレス鋼条材とＴｉ条材が直接接触するろう付け層構造であるため、基材の板厚残存率は６５％であり、被侵食の割合が非常に高かった。
【００６３】
従来例１の複合材は、基材の板厚残存率が９６％と高く、かつ、濡れ性及びろう付け生産性はいずれも良好であったものの、ろう付け層がＣｕろう材のみで形成されるため、耐腐食性が良好でなく、ろう付け部に腐食が観察された。
【００６４】
従来例２の複合材は、基材の板厚残存率が９５％と高く、かつ、耐腐食性及び濡れ性はいずれも良好であったものの、ろう付け層のろう材が粉末Ｎｉろう材であるため、ろう付け生産性が良好でなかった。
【００６５】
以上、本発明の実施の形態は、上述した実施の形態に限定されるものではなく、他にも種々のものが想定されることは言うまでもない。
【００６６】
【発明の効果】
以上要するに本発明によれば、次のような優れた効果を発揮する。
（１） 基材の表面に、Ｆｅ、Ｔｉ、及びＮｉを含むろう材で構成されるろう付け層を設けることで、従来のろう付け用複合材と比較して、同等又は同等以上の耐熱性、耐酸化性、及び耐食性を有し、かつ、ろう付け時における基材の被侵食の割合が低いろう付け用複合材が得られる。
（２） （１）のろう付け用複合材を用いてろう付けを行うことで、ろう付け製品の接合部の信頼性が良好となる。
【図面の簡単な説明】
【図１】 本発明に係るろう付け用複合材の第１の形態の断面図である。
【図２】 図１の第１変形例を示す断面図である。
【図３】 本発明に係るろう付け用複合材の第２の形態の断面図である。
【図４】 図３の第１変形例を示す断面図である。
【符号の説明】
１０，２０，４０，５０ ろう付け用複合材
１１，４１ 基材
１２，４２ Ｆｅ又はＦｅ−Ｎｉ、Ｆｅ−Ｃｒ合金層
１３，４３ Ｔｉ層
１４，４４ Ｎｉ又はＮｉ−Ｐ合金層[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a brazing composite material and a brazing product using the same, and more particularly to a composite material used for brazing a heat exchanger and a fuel cell member and a brazing product using the same.
[0002]
[Prior art]
Stainless steel-based clad materials are used as joining materials for automobile oil coolers. In this case, a Cu material having a function as a brazing material is clad on one side or both sides of a stainless steel plate as a base material.
[0003]
Further, as a brazing material for members made of stainless steel, Ni-base or Co-base alloy, various Ni brazing materials having excellent oxidation resistance and corrosion resistance at the joint are defined by JIS standards.
[0004]
Furthermore, as a Ni brazing material used for joining heat exchangers, 4 to 22% by weight of a metal powder selected from Ni, Cr, or Ni—Cr alloy is added to a powdered Ni brazing material. A powder Ni brazing material has been proposed (see JP 2000-107883 A).
[0005]
Further, there is a self-brazing composite material having a brazing layer made of Ni and Ti on the surface of stainless steel as a base material, that is, having a brazing layer structure of Ni / Ti / stainless steel (Japanese Patent Laid-Open No. 7-259992). Issue gazette).
[0006]
[Problems to be solved by the invention]
However, conventional brazing materials or brazing composite materials are used in heat exchangers (exhaust gas recirculation (hereinafter referred to as EGR (Exhaust Gas Recirculation)) coolers) that are exposed to high temperature, highly corrosive gases or liquids. When used as a brazing filler metal, there are the following problems.
[0007]
(1) When the above-mentioned stainless steel-based clad material is used as a joining material for an oil cooler for automobiles, there is no problem with respect to heat resistance, oxidation resistance, and corrosion resistance. When used as an EGR cooler, high temperature and highly corrosive exhaust gas is circulated. Therefore, in the brazing material (Cu material) of stainless steel clad material, heat resistance, oxidation resistance, and corrosion resistance There was a problem that was not enough.
[0008]
{Circle around (2)} Since the various Ni brazing materials described above are powdery, it is necessary to apply a powder Ni brazing material to each joint. That is, since much work is required for the brazing operation, the productivity of the brazed product is remarkably low, and as a result, there is a problem in that the manufacturing cost increases.
[0009]
(3) Although the above-mentioned self-brazing composite material exhibits a sufficient effect on heat resistance and corrosion resistance, the stainless steel of the base material is severely eroded by the brazing layer during brazing, and brazing is performed. There was a problem that the performance (strength, fatigue characteristics) of the later product was greatly reduced. Specifically, the Ni layer and the Ti layer are melted by heat treatment during brazing, but the reactivity between Ti and the stainless steel as the base material becomes excessive because the reactivity of Ti is extremely high. This is because the Fe component of the stainless steel substrate and Ti react with each other to easily produce an Fe-rich solid solution phase and intermetallic compounds such as Fe ₂ Ti and FeTi. As a result, since the Fe component of the base material is eluted (melted / dispersed) into the brazing layer, significant erosion occurs in the base material, and the thickness and volume of the base material before brazing cannot be secured. As a result, the joint strength of the joint is lowered, that is, the reliability of the brazed product is lowered.
[0010]
One object of the present invention created in view of the above circumstances is that heat resistance, oxidation resistance, and corrosion resistance are good, the rate of erosion of the base material during brazing is low, and brazing work It is to provide a brazing composite material having good properties.
[0011]
Another object of the present invention is to provide a brazed product having a good joint reliability and low manufacturing cost.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, a brazing composite material according to the present invention is a brazing composite material having a brazing layer on a substrate surface formed of stainless steel.
(1) The structure in which the layer structure of the brazing layer laminated on the surface of the base material has an Fe or Fe- 42 mass% Ni alloy layer, a Ti layer, and a Ni layer arranged in order from the base material side.
(2) The structure in which the layer structure of the brazing layer laminated on the surface of the base material has a Ni layer, a Ti layer, and an Fe or Fe- 42 mass% Ni alloy layer arranged in order from the base material side,
(3) The layer structure of the brazing layer laminated on the surface of the base material has an Fe or Fe- 42 mass% Ni alloy layer, a Ti layer, and a Ni-8 mass% P alloy layer in order from the base material side. Constitution,
(4) The layer structure of the brazing layer laminated on the surface of the base material has a Ni-8 mass% P alloy layer, a Ti layer, and an Fe or Fe- 42 mass% Ni alloy layer arranged in this order from the base material side. Constitution,
(5) The structure in which the layer structure of the brazing layer laminated on the surface of the base material has an Fe-25 mass% Cr alloy layer, a Ti layer, and a Ni layer arranged in this order from the base material side.
(6) The structure in which the layer structure of the brazing layer laminated on the surface of the base material has a Ni layer, a Ti layer, and an Fe-25 mass% Cr alloy layer arranged in this order from the base material side.
Of any one of (1) to (6),
The ratio of Ti to the total mass of Ti and Ni in the entire brazing layer (Ti mass / (Ti + Ni mass )) is 20 to 60 mass% ,
The ratio of Fe in the entire brazing layer (the mass of Fe / the mass of the entire brazing layer) is 10 to 50 mass% .
[0013]
According to the above configuration, since a brazing layer composed of a brazing material containing Fe, Ti or Fe, Ti, Ni is provided on the surface of the base material, compared with a conventional brazing composite material. Thus, a brazing composite material having heat resistance, oxidation resistance, and corrosion resistance equal to or higher than that and having a low rate of erosion of the base material during brazing can be obtained.
[0014]
On the other hand, a brazed product using the brazing composite material according to the present invention is joined using the brazing composite material described above.
[0015]
By performing brazing (joining) using the brazing composite material having the above-described configuration, the reliability of the joint portion of the brazed product is improved.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a preferred embodiment of the invention will be described with reference to the accompanying drawings.
[0017]
The present inventors have the same heat resistance and corrosion resistance as a conventional self-brazing composite material (Ni-Ti brazing material), and at the time of brazing, corrosion of stainless steel as a base material by Ti ( As a result of various investigations on the structure of a brazing composite material that is less melted and dispersed in the brazing layer and is easy to braze, the brazing layer is composed of a brazing material containing Fe, Ti, and Ni. As a result, a brazing composite material satisfying the above characteristics could be obtained.
[0018]
FIG. 1 is a sectional view of a first embodiment of a brazing composite material according to the present invention, FIG. 2 is a sectional view showing a first modification of FIG. 1, and FIG. 2 is a second sectional view of a brazing composite material according to the present invention. A cross-sectional view of this embodiment is shown in FIG. In FIGS. 2 and 3, the same members as those in FIG. 1 are denoted by the same reference numerals.
[0019]
As shown in FIG. 1, the brazing composite material 10 according to the present embodiment has a brazing layer (from the base material 11 side) on one side (upper surface in FIG. 1) of a base material 11 made of a stainless steel plate material. A clad material in which Fe or Fe-42 mass% Ni, Fe-25 mass% Cr alloy layer 12, Ti layer 13, and Ni or Ni-8 mass% P alloy layer 14) are provided in this order. Here, the brazing layer may be provided not only on one surface of the substrate 11 but also on both surfaces (upper and lower surfaces in FIG. 1).
[0020]
Fe or Fe-Ni, as a Fe-Cr alloy layer 12, in order prevent the TiC reacts with Ti of the Ti layer 13 is generated as much as possible, having a low C content is preferred. As the Fe alloy , an Fe-42 mass% Ni alloy and an Fe-8 mass% Cr alloy (ferritic stainless steel) are preferable. This is because Ni and Cr have the effect of improving the corrosion resistance and oxidation resistance of the brazed part (joint part).
[0021]
Moreover, as a Ni alloy which comprises Ni or Ni alloy layer 14, a Ni-8 mass% P alloy is preferable. This is because this alloy can improve the hot-water flow and wettability during brazing and reduce the solubility of the Fe component in stainless steel.
[0022]
Furthermore, the formation method of the clad material in which the brazing layer is provided on the surface of the base material 11 is not particularly limited, and all conventional methods for forming the clad material can be applied. Then, the method of integrating by rolling is mentioned.
[0023]
Further, in FIG. 1, Fe or Fe −42 mass% Ni, Fe-25 mass% Cr alloy layers 12 and 12, Ti layers 13 and 13, and Ni or Ni are sequentially formed on the surface of the substrate 11 from the substrate 11 side. Although the case where the −8 mass% P alloy layers 14 and 14 are provided has been described, the order of forming the layers 12, 13 and 14 is not limited thereto. For example, as shown in FIG. 2, on the surface of the base material 11, in order from the base material 11 side, Ni-8 mass% P alloy layers 14, 14, Ti layers 13, 13, and Fe or Fe- 42 mass% Ni alloy layer. Or the composite material 20 which provided the Fe-25mass% Cr alloy layers 12 and 12 may be sufficient . Here, it is preferable to use Fe -25mass% Cr alloy layer as Fe alloy layer 12, to place the Fe-25 mass% Cr alloy layer between the substrate 11 and the Ti layer 13, and the Fe component of stainless steel A barrier layer that prevents Ti from reacting is particularly preferable.
[0024]
Further, the outermost layer of the brazing layer (Ni or Ni-8 mass% P alloy layer 14 in FIG. 1, Fe or Fe-42 mass% Ni alloy layer or Fe-25 mass% Cr alloy layer 12 in FIG. 2 ) is formed. You may add at least 1 type of B or Si to the metal or alloy to perform. As a result, the melting point, wettability, toughness, and bonding strength of the brazing material can be adjusted.
[0025]
Next, the optimal ratio of Fe, Ti, and Ni in the entire brazing layer provided on the surface of the substrate 11 will be described.
[0026]
Ratio of Ti to the total mass of Ti and Ni in the entire brazing layer (Ti mass / (mass of Ti + Ni)) is preferably from 20 to 60 mass%, particularly 30 to 50 mass% is preferable. This is because if the Ti ratio is less than 20 mass% , the effect of lowering the melting temperature of the entire brazing layer cannot be sufficiently obtained, and the brazing layer does not melt during brazing. Further, if the Ti ratio exceeds 60 mass% , a large amount of intermetallic compounds are formed by the reaction between Ni and Ti, and the brazing layer becomes extremely brittle, so that the reliability of the brazed product cannot be expected. .
[0027]
The ratio of Fe in the entire brazing layer (brazing material) (the mass of Fe / the mass of the entire brazing layer) is preferably 10 to 50 mass% , particularly preferably 20 to 40 mass% . This is because the elution of the Fe component of the stainless steel cannot be suppressed if the Fe ratio is less than 10 mass% . Moreover, when the ratio of Fe exceeds 50 mass% , the hot water flow property is remarkably lowered, and normal brazing becomes difficult.
[0028]
Next, the operation of the present embodiment will be described.
[0029]
In order to suppress the reaction between the base material 11 made of stainless steel and Ti in the brazing material as much as possible, it is necessary to limit the Fe component in the stainless steel from eluting into the brazing layer.
[0030]
Therefore, in the composite material 10, 20 in the present embodiment, another layer (in in Figure 1 Fe or Fe-Ni, Fe-Cr alloy layer 12 between the substrate 11 and the Ti layer 13, in FIG. 2 Then, the Ni-P alloy 14) is arranged so that the base material 11 and the Ti layer 13 are not in direct contact with each other. Thereby, it is possible to suppress the reaction between the Fe component of the base material 11 and Ti of the Ti layer 13 as much as possible, thereby preventing the formation of an intermetallic compound between the base material 11 and the Ti layer 13. be able to.
[0031]
Further, in the composite materials 10 and 20 in the present embodiment, the brazing layer includes a brazing material (in FIG. 1 , Fe or Fe—Ni, Fe—Cr alloy) that is in direct contact with the base material 11 . The layer 12 is composed of a Ni-P alloy layer 14) in FIG. Thereby, the solubility of Fe in the molten brazing layer at the time of brazing decreases, and as a result, it is possible to limit elution of the Fe component of the base material 11 into the molten brazing layer.
[0032]
As described above, according to the brazing composite materials 10 and 20 of the present embodiment, the brazing layer composed of the brazing material containing Fe, Ti, and Ni is provided on the surface of the base material 11 made of stainless steel. Thus, it has the same heat resistance and corrosion resistance as a conventional self-brazing composite material (Ni-Ti brazing material) and suppresses the reaction between the base material 11 and Ti in the brazing material during brazing. (That is, the rate of erosion of the substrate 11 during brazing is reduced).
[0033]
Since the brazing composite materials 10 and 20 are clad materials, the composite materials 10 and 20 are formed using one member of the brazing members to be joined as a base material (or the brazing member to be joined). The composite materials 10 and 20 are disposed between the joint portions, and brazing members are joined together using the composite materials 10 and 20 to produce a brazed product. Thus, like various conventional Ni brazing materials, There is no need to apply a powder Ni brazing material to each joint, and no great effort is required for the brazing work (the brazing workability is improved). As a result, the yield and productivity of the brazed product are improved, and the manufacturing cost can be reduced.
[0034]
Further, since the brazing material constituting the brazing layer of the brazing composite materials 10 and 20 hardly erodes the base material 11 at the time of brazing, the thickness and volume of the base material 11 even after brazing. There is almost no change from before brazing. As a result, the bonding strength of the joint between the brazing members does not decrease, and as a result, the reliability of the joint of the brazed product increases.
[0035]
The brazing composites 10 and 20 according to the present embodiment are not limited to heat exchangers that are exposed to high-temperature, highly corrosive gases or liquids such as EGR coolers. For example, the present invention can be applied to various uses such as a fuel cell reformer cooler and a fuel cell member.
[0036]
Next, another embodiment of the present invention will be described with reference to the accompanying drawings.
[0037]
The cross-sectional view of a second embodiment of the brazing composite material according to the present invention shown in FIGS. 3 and 4 is a sectional view showing a first modification of FIG.
[0038]
The brazing composite material 10 of the previous embodiment was a clad material in which a brazing layer was provided on the surface of a base material 11 made of a plate material.
[0039]
On the other hand, as shown in FIG. 3 , the brazing composite material 40 according to the present embodiment has a brazing layer (in order from the base material 41 side) on the outer periphery of the rod-like or wire-like base material 41. Alternatively, an Fe—Ni, Fe—Cr alloy layer 42, a Ti layer 43, and an Ni or Ni—P alloy layer 44 are provided.
[0040]
The brazing layer is formed by a plating method, an extrusion method, a pipe making method, or the like.
[0041]
In FIG. 3 , Fe or Fe—Ni, Fe—Cr alloy layer 42, Ti layer 43, and Ni or Ni—P alloy layer 44 are provided on the outer periphery of the substrate 41 in this order from the substrate 41 side. Although the case has been described, the formation order of the layers 42, 43, 44 is not limited to this. For example, as shown in FIG. 4 , a Ni—P alloy layer 44, a Ti layer 43, and Fe or Fe—Ni, Fe—Cr alloy layer 42 are provided on the outer periphery of the base material 41 in this order from the base material 41 side. The composite material 50 may be used . Here, it is preferable to use an Fe—Cr based alloy layer as the Fe alloy layer 42, and this Fe—Cr based alloy layer is disposed between the base material 41 and the Ti layer 43, and the Fe component and Ti in the stainless steel are A barrier layer that prevents reaction is particularly preferable.
[0042]
Needless to say, in the brazing composite materials 40 and 50 according to the present embodiment, the same effects as those of the composite materials 10 and 20 according to the previous embodiment can be obtained.
[0043]
The brazing composite materials 40 and 50 of the present embodiment include an oil cooler, a radiator, a secondary battery, in addition to a heat exchanger such as an EGR cooler, a fuel cell reformer cooler, and a fuel cell member. It can also be applied to members.
[0044]
【Example】
(Example 1)
Made of SUS304 (JIS standard), on the surface of a stainless steel strip with a thickness of 2.5 mm and a width of 150 mm, an Fe strip with a thickness of 0.12 mm and a Ti strip with a thickness of 0.2 mm in this order from the stainless steel strip side. A material and a 0.15 mm-thick Ni strip were laminated and rolled to form a clad material in which the proportion of Fe in the entire brazing layer was 30 mass% . Thereafter, the clad material was repeatedly rolled to produce a brazing composite material having a total brazing layer thickness of 70 μm.
[0045]
(Example 2)
Example 1 except that a Fe-42 mass% Ni alloy strip having a thickness of 0.12 mm was used instead of the Fe strip, and the proportion of Fe in the entire brazing layer of the clad was 14 mass%. Similarly, a brazing composite material was produced.
[0046]
(Example 3)
An example is used except that a Fe-25 mass% Cr alloy strip having a thickness of 0.12 mm is used instead of the Fe strip, and the ratio of Fe in the entire brazing layer of the clad material is 22.5 mass%. In the same manner as in No. 1, a brazing composite material was produced.
[0047]
Example 4
A brazing composite material in the same manner as in Example 1 except that a Ni-8 mass% P alloy was used instead of the Ni strip and the proportion of Fe in the entire brazing layer of the clad material was 30 mass%. Was made.
[0048]
(Comparative Example 1)
A brazing composite material was produced in the same manner as in Example 1 except that the proportion of Fe in the entire brazing layer of the clad material was 5 mass% .
[0049]
(Comparative Example 2)
A brazing composite material was produced in the same manner as in Example 1 except that the ratio of Fe in the entire brazing layer of the clad material was 55 mass% .
[0050]
(Comparative Example 3)
On the surface of the same stainless steel strip as in Example 1, a 0.2 mm thick Ti strip and a 0.15 mm thick Ni strip are laminated in order from the stainless steel strip side and rolled, and then clad material. Formed. Thereafter, the clad material was repeatedly rolled to produce a brazing composite material having a total brazing layer thickness of 50 μm.
[0051]
(Comparative Example 4)
On the surface of the same stainless steel strip as in Example 1, in order from the stainless steel strip side, a Ni strip having a thickness of 0.08 mm, a Ti strip having a thickness of 0.2 mm, and a Ni strip having a thickness of 0.08 mm. The materials were laminated and rolled to form a clad material. Thereafter, the clad material was repeatedly rolled to produce a brazing composite material having a total brazing layer thickness of 50 μm.
[0052]
(Conventional example 1)
On the surface of the same stainless steel strip as in Example 1, a Cu strip having a thickness of 0.5 mm was laminated and rolled to form a clad material. Thereafter, rolling was repeatedly performed on the clad material to produce a brazing composite material having a Cu layer thickness of 50 μm.
[0053]
(Conventional example 2)
On the surface of the same stainless steel strip as in Example 1, a kneaded material obtained by dissolving a commercially available powdered Ni brazing material (average particle size 35 μm) with a binder of a synthetic resin (polymer resin) was applied to form a brazing composite material. Produced.
[0054]
Table 1 shows the specifications of the brazing composite materials of Examples 1 to 4, Comparative Examples 1 to 4, and Conventional Examples 1 and 2.
[0055]
[Table 1]

[0056]
Next, for each composite material, the corrosion rate (corrosion rate), corrosion resistance, brazing material wettability, and brazing productivity (workability) of the stainless steel strip that is the base material are evaluated. went. Various evaluation results are shown in Table 2.
[0057]
Here, the evaluation of the rate of erosion is the base material after each composite material is heated to 1150 ° C. in a vacuum furnace at a maximum to melt the brazing layer, and then the cross section of each composite material is observed. The measurement was performed by measuring the remaining thickness ratio of the stainless steel strip (plate thickness after heat treatment × 100 / plate thickness before heat treatment (%)). The corrosion resistance is evaluated by immersing each composite material in a corrosive solution containing chlorine ion, nitrate ion, and sulfate ion for 1000 hours, and then performing a corrosion test, and then removing each composite material from the solution. This was done by observing the structure of the brazed part and examining the occurrence of corrosion. The wettability was evaluated by placing a stainless steel pipe made of SUS304 on the surface of the brazing layer of each composite material, and brazing by heating to a maximum of 1150 ° C. in a vacuum furnace. (Chamfering) Evaluation was performed according to the shape.
[0058]
[Table 2]

[0059]
As shown in Table 2, in the composite materials of Examples 1 to 4 which are the composite materials for brazing according to the present invention, the brazing layer is formed of a brazing material containing Fe, Ti, and Ni, and brazing Since the ratio of Fe in the entire adhesive layer is within the specified range (10 to 50 mass% ), the remaining thickness ratio of the base material was 97, 93, 96 and 97 (%), respectively. Moreover, corrosion resistance, wettability, and brazing productivity were all good.
[0060]
In contrast, the composite material of Comparative Example 1 had good corrosion resistance, wettability, and brazing productivity, but the proportion of Fe in the entire brazing layer was 5 mass outside the specified range. % , The base plate thickness remaining rate was 80%, and the rate of erosion was slightly high.
[0061]
Although the composite material of Comparative Example 2 had a high base plate residual rate of 98% and both corrosion resistance and brazing productivity were good, the proportion of Fe in the entire brazing layer was within the specified range. Since the other 55 mass% was high, that is, the ratio of Ni and Ti was low, the wettability was poor.
[0062]
The composite materials of Comparative Examples 3 and 4 were all good in corrosion resistance, wettability, and brazing productivity. However, in the composite material of Comparative Example 4, since the brazing layer is formed of Ni and Ti brazing material and does not contain Fe brazing material, the residual thickness of the base material is 78%, and the erosion ratio is it was high. Further, the composite material of Comparative Example 3 has a brazing layer structure in which the brazing layer is formed of Ni and Ti brazing material, that is, does not contain Fe brazing material, and the stainless steel strip and Ti strip are in direct contact. Therefore, the residual thickness ratio of the base material was 65%, and the rate of erosion was very high.
[0063]
Although the composite material of Conventional Example 1 has a high base plate residual rate of 96% and good wettability and brazing productivity, the brazing layer is formed only of the Cu brazing material. Therefore, the corrosion resistance was not good, and corrosion was observed in the brazed part.
[0064]
The composite material of Conventional Example 2 has a high sheet thickness residual ratio of 95% and good corrosion resistance and wettability, but the brazing material of the brazing layer is a powder Ni brazing material. Therefore, brazing productivity was not good.
[0065]
As mentioned above, it cannot be overemphasized that embodiment of this invention is not limited to embodiment mentioned above, and various things are assumed in addition.
[0066]
【The invention's effect】
In short, according to the present invention, the following excellent effects are exhibited.
(1) By providing a brazing layer composed of a brazing material containing Fe, Ti, and Ni on the surface of the base material, the heat resistance is equivalent or equivalent to that of a conventional brazing composite material. Thus, a brazing composite material having oxidation resistance and corrosion resistance and having a low rate of erosion of the base material during brazing can be obtained.
(2) By performing brazing using the brazing composite material of (1), the reliability of the joint of the brazed product is improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a first embodiment of a brazing composite material according to the present invention.
FIG. 2 is a cross-sectional view showing a first modification of FIG.
FIG. 3 is a sectional view of a second embodiment of the brazing composite material according to the present invention.
4 is a cross-sectional view showing a first modification of FIG . 3;
[Explanation of symbols]
10 , 20 , 40, 50 Brazing composite 11, 41 Base 12, 42 Fe or Fe-Ni, Fe-Cr alloy layer 13, 43 Ti layer 14, 44 Ni or Ni-P alloy layer

Claims (7)

In a brazing composite material having a brazing layer on a substrate surface formed of stainless steel,
The layer structure of the brazing layer laminated on the surface of the base material has a configuration in which Fe or Fe- 42 mass% Ni alloy layer, Ti layer, and Ni layer are arranged in order from the base material side.
The ratio of Ti to the total mass of Ti and Ni in the entire brazing layer (Ti mass / (Ti + Ni mass )) is 20 to 60 mass% ,
The brazing composite material, wherein a ratio of Fe in the entire brazing layer (Fe mass / mass of the entire brazing layer) is 10 to 50 mass% . In a brazing composite material having a brazing layer on a substrate surface formed of stainless steel,
The layer structure of the brazing layer laminated on the surface of the base material has a configuration in which an Ni layer, a Ti layer, and an Fe or Fe- 42 mass% Ni alloy layer are arranged in this order from the base material side.
The ratio of Ti to the total mass of Ti and Ni in the entire brazing layer (Ti mass / (Ti + Ni mass )) is 20 to 60 mass% ,
The brazing composite material, wherein a ratio of Fe in the entire brazing layer (Fe mass / mass of the entire brazing layer) is 10 to 50 mass% . In a brazing composite material having a brazing layer on a substrate surface formed of stainless steel,
The layer structure of the brazing layer laminated on the surface of the base material has a configuration in which an Fe or Fe- 42 mass% Ni alloy layer, a Ti layer, and a Ni-8 mass% P alloy layer are arranged in this order from the base material side. ,
The ratio of Ti to the total mass of Ti and Ni in the entire brazing layer (Ti mass / (Ti + Ni mass )) is 20 to 60 mass% ,
The brazing composite material, wherein a ratio of Fe in the entire brazing layer (Fe mass / mass of the entire brazing layer) is 10 to 50 mass% . In a brazing composite material having a brazing layer on a substrate surface formed of stainless steel,
The layer structure of the brazing layer laminated on the surface of the base material is composed of a Ni-8 mass% P alloy layer, a Ti layer, and an Fe or Fe- 42 mass% Ni alloy layer arranged in this order from the base material side. ,
The ratio of Ti to the total mass of Ti and Ni in the entire brazing layer (Ti mass / (Ti + Ni mass )) is 20 to 60 mass% ,
The brazing composite material, wherein a ratio of Fe in the entire brazing layer (Fe mass / mass of the entire brazing layer) is 10 to 50 mass% . In a brazing composite material having a brazing layer on a substrate surface formed of stainless steel,
The layer structure of the brazing layer laminated on the surface of the base material has a configuration in which an Fe-25 mass% Cr alloy layer, a Ti layer, and an Ni layer are arranged in order from the base material side.
The ratio of Ti to the total mass of Ti and Ni in the entire brazing layer (Ti mass / (Ti + Ni mass )) is 20 to 60 mass% ,
The brazing composite material, wherein a ratio of Fe in the entire brazing layer (Fe mass / mass of the entire brazing layer) is 10 to 50 mass% . In a brazing composite material having a brazing layer on a substrate surface formed of stainless steel,
The layer structure of the brazing layer laminated on the surface of the base material has a configuration in which a Ni layer, a Ti layer, and an Fe-25 mass% Cr alloy layer are arranged in this order from the base material side.
The ratio of Ti to the total mass of Ti and Ni in the entire brazing layer (Ti mass / (Ti + Ni mass )) is 20 to 60 mass% ,
The brazing composite material, wherein a ratio of Fe in the entire brazing layer (Fe mass / mass of the entire brazing layer) is 10 to 50 mass% .   A brazed product, which is joined using the brazing composite material according to claim 1.

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