CN115519198A - Titanium-aluminum/nickel-based high-temperature alloy heterogeneous porous sandwich structure product and preparation method thereof - Google Patents

Abstract

The invention relates to the technical field of porous structure strengthening, in particular to a titanium aluminum/nickel-based superalloy heterogeneous porous sandwich structure product and a preparation method thereof, wherein the method comprises the following steps: obtaining a porous structure, a panel, a noble metal and a nickel-based amorphous thin strip, and putting the panel and the porous structure into an acetone solution for cleaning; the porous structure is made of nickel-based high-temperature alloy, and the panel is made of titanium-aluminum alloy; plating noble metal on the surface to be connected of the panel by adopting magnetron sputtering to form a noble metal layer; sequentially laminating and assembling a panel, a noble metal layer, a nickel-based amorphous thin strip, a porous structure layer, a nickel-based amorphous thin strip, a noble metal layer and the panel into a sandwich structure to obtain an assembly part; and placing the assembly part in a vacuum diffusion furnace, heating and preserving heat to obtain a product, wherein the added noble metal does not react with other elements in the joint to form a brittle phase, but is completely dissolved in the nickel matrix in the brazing seam in a solid solution manner and is in dispersed distribution to form a solid solution strengthening effect, and the strength of the joint is effectively improved.

Description

Titanium-aluminum/nickel-based superalloy heterogeneous porous sandwich structure product and preparation method

technical field

The invention relates to the technical field of porous interlayer structure strengthening, in particular to a titanium-aluminum/nickel-based superalloy heterogeneous porous interlayer structure product and a preparation method.

Background technique

The thermal protection system is the key technology of the carrier. The thermal protection system requires good heat insulation effect. The metal thermal protection structure has become the first choice for the thermal protection system of the reusable carrier due to its unique advantages. Its typical representative is the US X-33 The designed metal thermal protection system.

The traditional metal thermal protection structure is composed of two superalloy panels and a superalloy core in the middle. Most of the superalloy cores adopt a porous structure. At present, the preparation of the superalloy porous sandwich structure mainly adopts vacuum brazing technology. Since the homogeneous porous sandwich structure cannot better achieve the results of weight reduction and performance, the heterogeneous porous sandwich structure is expected to partially replace the homogeneous porous sandwich structure in the thermal protection system of ultra-high-speed aircraft.

In practice, the inventor finds that the above-mentioned prior art has the following defects:

During the brazing connection process of the heterogeneous porous sandwich structure, a large number of intermetallic compounds are formed in the joint, and the wettability of the solder on the two base materials is different, which is easy to form defects such as dissolution, and the joint becomes the weak area of the structure, becoming Hidden dangers of heterogeneous porous sandwich structure serving in high temperature environment.

Contents of the invention

In order to solve the above-mentioned technical problems, the object of the present invention is to provide a titanium-aluminum/nickel-based superalloy heterogeneous porous sandwich structure product and a preparation method, and the adopted technical scheme is specifically as follows:

In the first aspect, an embodiment of the present invention provides a method for preparing a titanium-aluminum/nickel-based superalloy heterogeneous porous sandwich structure, the preparation method comprising the following steps:

Obtain the porous structure, panel, noble metal and nickel-based amorphous strip, put the panel and porous structure into an acetone solution for cleaning; wherein the material of the porous structure is a nickel-based superalloy, and the material of the panel is titanium aluminum alloy;

Plating the noble metal on the surface to be connected of the panel by magnetron sputtering to form a noble metal layer;

The sandwich structure is obtained by stacking and assembling the panel, the noble metal layer, the nickel-based amorphous strip, the porous structure layer, the nickel-based amorphous strip, the noble metal layer and the panel in sequence;

The assembly is placed in a vacuum diffusion furnace, heated to 1020-1080° C., and kept warm for 1-30 minutes to obtain a titanium-aluminum/nickel-based superalloy heterogeneous porous sandwich structure product.

Further, the noble metal is any one of gold, platinum or palladium.

Further, the mass of the precious metal layer accounts for 0.5wt.%-5wt.% of the total mass of the solder.

Further, the thickness of the nickel-based amorphous ribbon is 50 μm-200 μm.

Further, the chemical composition of the nickel-based amorphous strip includes Cr: 6%-8%, Si: 4%-5%, B:

2.75%-3.5%, Fe: 2.5%-3.5%, Ni: balance.

Further, the porous structure is any one of a honeycomb porous structure, a foam porous structure, a rectangular porous structure, a triangular porous structure, and a rhombus porous structure.

Further, in the vacuum diffusion furnace, after the vacuum degree is less than 3.0×10 ^-3 Pa, the temperature is raised to 1020-1080°C at a rate of 20°C/min, kept for 1-30min, and the temperature is lowered to 600°C at a rate of 5°C/min , cooled to room temperature with the furnace to obtain the product.

On the other hand, another embodiment of the present invention also provides a titanium-aluminum/nickel-based superalloy heterogeneous porous sandwich structure product, which is prepared by any one of the methods described above.

The present invention has following beneficial effects:

The precious metal added according to the above preparation method does not react with other elements in the joint to form a brittle phase, but is completely dissolved in the nickel matrix in the brazing joint, and is dispersedly distributed, forming a solid solution strengthening effect and effectively improving the strength of the joint. At the same time, since the planar tensile strength of the porous structure layer is effectively increased by more than 70%, the fracture position is transferred from the interface between the core and the panel to the middle of the core, which effectively improves the mechanical properties of the brazed joint and effectively solves the existing problem. In the technology, when brazing the nickel-based superalloy core body and the titanium-aluminum alloy panel with nickel-based brazing filler metal, a large number of compounds are precipitated and enriched at the interface of the brazing seam, which is prone to corrosion and leads to performance degradation.

Description of drawings

In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Apparently, the appended The drawings are only some embodiments of the present invention, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural view of a product provided by an embodiment of the present invention;

Fig. 2 is a flowchart of a method for preparing a titanium-aluminum/nickel-based superalloy heterogeneous porous sandwich structure provided by an embodiment of the present invention.

detailed description

In order to further explain the technical means and effects of the present invention to achieve the intended purpose of the invention, a kind of titanium-aluminum/nickel-based superalloy heterogeneous porous sandwich structure product proposed according to the present invention will be described below in conjunction with the accompanying drawings and preferred embodiments. And preparation method, its specific embodiment, structure, feature and effect thereof, detailed description is as follows. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, the particular features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention.

The specific scheme of a titanium-aluminum/nickel-based superalloy heterogeneous porous sandwich structure product and its preparation method provided by the present invention will be described in detail below with reference to the accompanying drawings.

Please refer to FIG. 1 , an embodiment of the present invention provides a titanium-aluminum/nickel-based superalloy heterogeneous porous sandwich structure product, including a porous structure, a panel, a precious metal and a nickel-based amorphous strip.

Among them, the porous structure, the panel, the noble metal and the nickel-based amorphous strip are in order according to the panel 10, the noble metal layer 20, the nickel-based amorphous strip 30, the porous structure layer 40, the nickel-based amorphous strip 30, the noble metal layer 20 and the panel. 10 sequential cascading settings.

Wherein, the porous structure layer 40 can be any one of a honeycomb structure layer, a foam porous structure, a rectangular porous structure, a triangular porous structure and a diamond porous structure, and the material is a nickel-based superalloy.

Wherein, the material of the panel 10 is titanium aluminum alloy.

Wherein, the material of the noble metal may be gold, platinum or palladium.

Referring to Fig. 2, an embodiment of the present invention also provides a method for preparing a titanium-aluminum/nickel-based superalloy heterogeneous porous sandwich structure, the preparation method comprising the following steps:

Step S001, obtaining a porous structure, a panel, a noble metal, and a nickel-based amorphous strip, and cleaning the panel and the porous structure in an acetone solution; wherein the material of the porous structure is a nickel-based superalloy.

Wherein, the porous structure can be any one of honeycomb structure, foam porous structure, rectangular porous structure, triangular porous structure and diamond porous structure, and the material is nickel-based superalloy.

Wherein, the noble metal as the target material can be any one of gold, platinum or palladium; the mass of the noble metal layer accounts for 0.5wt.%-5wt.% of the total mass of the solder.

Wherein, the thickness of the nickel-based amorphous strip is 50 μm to 200 μm. Nickel-based amorphous strips are also called BNi-2 amorphous strips. According to mass percentage, its chemical composition includes Cr: 6%-8%, Si: 4%-5%, B:

2.75%-3.5%, Fe: 2.5%-3.5%, Ni: balance.

Wherein, the material of the panel is titanium aluminum alloy.

Specifically, firstly, the panel and the porous structure are subjected to wire electric discharge processing to obtain a panel and a porous core of a suitable size; then, the processed panel and the porous core are ultrasonically cleaned in an acetone solution for 10 minutes.

Step S002, using magnetron sputtering to plate noble metal on the surface to be connected of the panel to form a noble metal layer.

The surface to be connected of the panel refers to the side that is connected with other structures after forming the sandwich structure. The surface to be connected is plated with a noble metal layer, and then forms a sandwich structure with nickel-based amorphous strip and porous structure layer in turn.

Step S003 , sequentially stacking and assembling the panel, the precious metal layer, the nickel-based amorphous strip, the porous structure layer, the nickel-based amorphous strip, the noble metal layer and the panel into a sandwich structure to obtain an assembly.

Step S004, placing the assembly in a vacuum diffusion furnace, heating the temperature to 1020-1080° C., and keeping it warm for 1-30 minutes to obtain the product.

Among them, in the vacuum diffusion furnace, after the vacuum degree is less than 3.0×10 ^-3 Pa, the temperature is raised to 1020-1080°C at a rate of 20°C/min, kept for 1-30min, and the temperature is reduced to 600°C at a rate of 5°C/min. , cool down to room temperature with the furnace, and take out the product.

The precious metal added according to the above method does not react with other elements in the joint to form a brittle phase, but is completely dissolved in the nickel matrix in the brazing joint, and is distributed in a dispersed manner, forming a solid solution strengthening effect and effectively improving the strength of the joint. Wherein, the joint in the embodiment of the present invention refers to the connection between the porous structure and the panel, and the core refers to the porous structure layer, which will not be stated below. At the same time, since the planar tensile strength of the porous structure layer is effectively increased by more than 70%, the fracture position is transferred from the interface between the core and the panel to the middle of the core, which effectively improves the mechanical properties of the joint and effectively solves the problem of the existing technology. When brazing nickel-based superalloy core body and titanium-aluminum alloy panel with medium-nickel-based brazing filler metal, a large number of compounds at the interface of the brazing seam are seriously precipitated and enriched, and it is easy to form corrosion and cause performance degradation.

The technical solution of the present application is not limited to the specific implementation manners exemplified below, but also includes any combination of the specific implementation manners.

Example 1

A method for preparing a titanium-aluminum/nickel-based superalloy heterogeneous porous sandwich structure, including:

Obtain porous structure, panels, precious metals and nickel-based amorphous thin strips. Among them, the panel material is TiAl alloy, the porous structure is a honeycomb porous structure, and the material selected is GH3536 nickel-based superalloy, with a size of 40mm×30mm×12mm. The diameter of the inscribed circle is 1.6mm, and the wall thickness of the core is 0.05mm. The nickel-based amorphous ribbon is also called BNi-2 amorphous ribbon, and the size of the nickel-based amorphous ribbon is 40mm×30mm×0.1mm;

The panel and the porous structure are subjected to wire electric discharge processing to obtain a panel and the porous structure of a suitable size, and then the processed panel and the porous structure are ultrasonically cleaned in an acetone solution for 10 minutes;

Magnetron sputtering is used to plate gold on the surface to be connected of the panel to form a noble metal layer; the amount of gold added is 2wt.%.

The assembly is obtained by stacking and assembling the panel, the noble metal layer, the nickel-based amorphous strip, the porous structure layer, the nickel-based amorphous strip, the noble metal layer and the panel in sequence to form a sandwich structure; the thickness of the nickel-based amorphous strip is 100μm;

Place the assembly in a vacuum diffusion furnace. When the vacuum degree is lower than 3.0×10 ^-3 Pa, raise the temperature to 1030°C at a rate of 20°C/min, keep it warm for 5 minutes, and then cool to room temperature with the furnace, then take it out products.

The test results show that the test has achieved the strengthening of the joints of titanium-aluminum/nickel-based superalloy heterogeneous porous sandwich structure products. The joint structure is a typical nickel-based solid solution matrix, dispersed borides are distributed in the brazing seam, and gold is completely dissolved in the brazing seam. The nickel matrix in the core is evenly distributed. The flat tensile strength of the titanium-aluminum/nickel-based superalloy heterogeneous porous sandwich structure is 40.5MPa, and the fracture is in the middle of the core, which is 80.8% higher than that without gold addition.

Example 2

A method for preparing a titanium-aluminum/nickel-based superalloy heterogeneous porous sandwich structure, including:

Obtain porous structure, panels, precious metals and nickel-based amorphous thin strips. Among them, the panel material is TiAl alloy, the porous structure is a honeycomb porous structure, and the material selected is GH3536 nickel-based superalloy, with a size of 40mm×30mm×12mm. The diameter of the inscribed circle is 1.6mm, and the wall thickness of the core is 0.05mm. The nickel-based amorphous ribbon is also called BNi-2 amorphous ribbon, and the size of the nickel-based amorphous ribbon is 40mm×30mm×0.1mm;

The panel and the porous structure are subjected to wire electric discharge processing to obtain a panel and the porous structure of a suitable size, and then the processed panel and the porous structure are ultrasonically cleaned in an acetone solution for 10 minutes;

Magnetron sputtering is used to plate platinum on the surface to be connected of the panel to form a noble metal layer; the amount of platinum added is 1wt.%.

The assembly is obtained by stacking and assembling the panel, the noble metal layer, the nickel-based amorphous strip, the porous structure layer, the nickel-based amorphous strip, the noble metal layer and the panel in sequence to form a sandwich structure; the thickness of the nickel-based amorphous strip is 100μm;

Place the assembly in a vacuum diffusion furnace. When the vacuum degree is lower than 3.0×10 ^-3 Pa, raise the temperature to 1040°C at a rate of 20°C/min, keep it warm for 5 minutes, and then cool to room temperature with the furnace, then take it out products.

The test results show that the test has realized the strengthening of the joints of titanium-aluminum/nickel-based superalloy heterogeneous porous sandwich structure products. The joint structure is a typical nickel-based solid solution matrix, dispersed borides are distributed in the brazing seam, and platinum is completely dissolved in the brazing seam. The nickel matrix in the alloy is evenly distributed, and the flat tensile strength of the titanium-aluminum/nickel-based superalloy heterogeneous porous sandwich structure is 36.5MPa, most of which are broken in the core, which is 63% higher than that without platinum.

Example 3

A method for preparing a titanium-aluminum/nickel-based superalloy heterogeneous porous sandwich structure, including:

Obtain porous structure, panels, precious metals and nickel-based amorphous thin strips. Among them, the panel material is TiAl alloy, the porous structure is a honeycomb porous structure, and the material selected is GH3536 nickel-based superalloy, with a size of 40mm×30mm×12mm. The diameter of the inscribed circle is 1.6mm, and the wall thickness of the core is 0.05mm. The nickel-based amorphous ribbon is also called BNi-2 amorphous ribbon, and the size of the nickel-based amorphous ribbon is 40mm×30mm×0.15mm;

The panel and the porous structure are subjected to wire electric discharge processing to obtain a panel and the porous structure of a suitable size, and then the processed panel and the porous structure are ultrasonically cleaned in an acetone solution for 10 minutes;

Magnetron sputtering is used to plate palladium on the surface to be connected of the panel to form a noble metal layer; the amount of palladium added is 1.5wt.%.

The assembly is obtained by stacking and assembling the panel, the noble metal layer, the nickel-based amorphous strip, the porous structure layer, the nickel-based amorphous strip, the noble metal layer and the panel in sequence to form a sandwich structure; the thickness of the nickel-based amorphous strip is 100μm;

Place the assembly in a vacuum diffusion furnace. When the vacuum degree is lower than 3.0×10 ^-3 Pa, raise the temperature to 1030°C at a rate of 20°C/min, keep it warm for 5 minutes, and then cool to room temperature with the furnace, then take it out products.

The test results show that the test has realized the strengthening of the joints of titanium-aluminum/nickel-based superalloy heterogeneous porous sandwich structure products. The joint structure is a typical nickel-based solid solution matrix, dispersed borides are distributed in the brazing seam, and palladium is completely dissolved in the brazing seam. The nickel matrix in the alloy is evenly distributed, and the flat tensile strength of the titanium-aluminum/nickel-based superalloy heterogeneous porous sandwich structure is 33.4MPa, which is 49% higher than that without palladium.

Example 4

A method for preparing a titanium-aluminum/nickel-based superalloy heterogeneous porous sandwich structure, including:

Obtain porous structure, panels, precious metals and nickel-based amorphous thin strips. Among them, the panel material is TiAl alloy, the porous structure is a honeycomb porous structure, and the material selected is GH3536 nickel-based superalloy, with a size of 40mm×30mm×12mm. The diameter of the inscribed circle is 2.6mm, and the wall thickness of the core is 0.05mm. The nickel-based amorphous ribbon is also called BNi-2 amorphous ribbon, and the size of the nickel-based amorphous ribbon is 40mm×30mm×0.1mm;

The panel and the porous structure are subjected to wire electric discharge processing to obtain a panel and the porous structure of a suitable size, and then the processed panel and the porous structure are ultrasonically cleaned in an acetone solution for 10 minutes;

Magnetron sputtering is used to plate gold on the surface to be connected of the panel to form a noble metal layer; the amount of gold added is 1.5wt.%.

The assembly is obtained by stacking and assembling the panel, the noble metal layer, the nickel-based amorphous strip, the porous structure layer, the nickel-based amorphous strip, the noble metal layer and the panel in sequence to form a sandwich structure; the thickness of the nickel-based amorphous strip is 100μm;

Place the assembly in a vacuum diffusion furnace. When the vacuum degree is lower than 3.0×10 ^-3 Pa, raise the temperature to 1050°C at a rate of 20°C/min, keep it warm for 1min, and then cool to room temperature with the furnace, then take it out products.

The test results show that the test has realized the strengthening of the joints of titanium-aluminum/nickel-based superalloy heterogeneous porous sandwich structure products. The joint structure is a typical nickel-based solid solution matrix, and a good obtuse angle is formed at the joint. The tensile strength of the porous sandwich structure is 20.4MPa, and the fracture is in the middle of the core, which is 90.3% higher than that without gold addition.

It should be noted that: the order of the above embodiments of the present invention is only for description, and does not represent the advantages and disadvantages of the embodiments. And the above describes the specific embodiments of this specification. Other implementations are within the scope of the following claims. In some cases, the actions or steps recited in the claims can be performed in an order different from that in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. Multitasking and parallel processing are also possible or may be advantageous in certain embodiments.

Each embodiment in this specification is described in a progressive manner, the same and similar parts of each embodiment can be referred to each other, and each embodiment focuses on the differences from other embodiments.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (8)

1. A method for preparing a titanium-aluminum/nickel-based superalloy heterogeneous porous sandwich structure, characterized in that the preparation method comprises the following steps: Obtain the porous structure, panel, noble metal and nickel-based amorphous strip, put the panel and porous structure into an acetone solution for cleaning; wherein the material of the porous structure is a nickel-based superalloy, and the material of the panel is titanium aluminum alloy; Plating the noble metal on the surface to be connected of the panel by magnetron sputtering to form a noble metal layer; The sandwich structure is obtained by stacking and assembling the panel, the noble metal layer, the nickel-based amorphous strip, the porous structure layer, the nickel-based amorphous strip, the noble metal layer and the panel in sequence; The assembly is placed in a vacuum diffusion furnace, heated to 1020-1080° C., and kept warm for 1-30 minutes to obtain a titanium-aluminum/nickel-based superalloy heterogeneous porous sandwich structure product. 2. The method for preparing a titanium-aluminum/nickel-based superalloy heterogeneous porous sandwich structure according to claim 1, wherein the noble metal is any one of gold, platinum or palladium. 3. The method for preparing a titanium-aluminum/nickel-based superalloy heterogeneous porous sandwich structure according to claim 1, wherein the mass of the noble metal layer accounts for 0.5wt.%-5wt.% of the total mass of the solder. 4 . The method for preparing a titanium-aluminum/nickel-based superalloy heterogeneous porous sandwich structure according to claim 1 , wherein the thickness of the nickel-based amorphous ribbon is 50 μm to 200 μm. 5. The method for preparing a titanium-aluminum/nickel-based superalloy heterogeneous porous sandwich structure according to claim 1, wherein the chemical composition of the nickel-based amorphous ribbon includes Cr: 6%-8%, Si: 4%-5%, B: 2.75%-3.5%, Fe: 2.5%-3.5%, Ni: balance. 6. The method for preparing a titanium-aluminum/nickel-based superalloy heterogeneous porous sandwich structure according to claim 1, wherein the porous structure is a honeycomb porous structure, a foam porous structure, a rectangular porous structure, a triangular porous structure, a rhombus Any of the porous structures. 7. The method for preparing a titanium-aluminum/nickel-based superalloy heterogeneous porous sandwich structure according to claim 1, characterized in that, in the vacuum diffusion furnace, after the vacuum degree is less than 3.0×10 ^-3 Pa, at 20°C/min The heating rate is raised to 1020-1080°C, the temperature is kept for 1-30 minutes, the cooling rate is 5°C/min to 600°C, and the product is obtained by cooling to room temperature with the furnace. 8. A titanium-aluminum/nickel-based superalloy heterogeneous porous sandwich structure product, characterized in that it is prepared by the method described in any one of claims 1-7.

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