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

Abstract

The present invention relates to the technical field of porous structure strengthening, and specifically to a titanium-aluminum / nickel-based high-temperature alloy heterogeneous porous sandwich structure product and a preparation method thereof. The method comprises: obtaining a porous structure, a panel, a precious metal and a nickel-based amorphous thin strip, and placing the panel and the porous structure in an acetone solution for cleaning; the porous structure is made of a nickel-based high-temperature alloy, and the panel is made of a titanium-aluminum alloy; the precious metal is plated on the surface of the panel to be connected by magnetron sputtering to form a precious metal layer; the panel, the precious metal layer, the nickel-based amorphous thin strip, the porous structure layer, the nickel-based amorphous thin strip, the precious metal layer and the panel are stacked and assembled in this order to form a sandwich structure to obtain an assembly part; the assembly part is placed in a vacuum diffusion furnace, and after heating and heat preservation, a product is obtained, wherein the added precious 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 and is dispersedly distributed, forming a solid solution strengthening effect, and effectively improving the strength of the joint.

Description

Technical Field

[0001] The present invention relates to the technical field of porous sandwich structure strengthening, and in particular to a titanium-aluminum / nickel-based high-temperature alloy heterogeneous porous sandwich structure product and a preparation method thereof. Background Art

[0002] The thermal protection system is a key technology for launch vehicles. The thermal protection system requires good thermal insulation. Metal thermal protection structures have become the first choice for thermal protection systems of reusable launch vehicles due to their unique advantages. A typical example is the metal thermal protection system designed for the US X-33.

[0003] Traditional metal thermal protection structures consist of two high-temperature alloy faceplates with a high-temperature alloy core between them. The high-temperature alloy core is typically porous, and vacuum brazing is currently the primary method for fabricating high-temperature alloy porous sandwich structures. Because homogeneous porous sandwich structures cannot achieve optimal weight reduction and performance, heterogeneous porous sandwich structures are expected to partially replace homogeneous porous sandwich structures in the thermal protection systems of hypersonic vehicles.

[0004] In practice, the inventors found that the above-mentioned prior art has the following defects:

[0005] During the brazing connection process of heterogeneous porous sandwich structures, a large amount of intermetallic compounds are formed in the joints, and the wettability of the brazing filler metal on the two base materials is different, which easily leads to defects such as dissolution. The joints become the weak areas of the structure and become a hidden danger for the heterogeneous porous sandwich structures to serve in high-temperature environments. Summary of the Invention

[0006] In order to solve the above technical problems, the purpose of the present invention is to provide a titanium aluminum / nickel-based high-temperature alloy heterogeneous porous sandwich structure product and a preparation method. The technical solutions adopted are as follows:

[0007] In a first aspect, an embodiment of the present invention provides a method for preparing a titanium-aluminum / nickel-based high-temperature alloy heterogeneous porous sandwich structure, the preparation method comprising the following steps:

[0008] Obtain a porous structure, a panel, a precious metal, and a nickel-based amorphous thin strip, and place the panel and the porous structure in an acetone solution for cleaning; wherein the porous structure is made of a nickel-based high-temperature alloy, and the panel is made of a titanium-aluminum alloy;

[0009] Plating the noble metal on the surface to be connected of the panel by magnetron sputtering to form a noble metal layer;

[0010] The panel, the noble metal layer, the nickel-based amorphous thin strip, the porous structure layer, the nickel-based amorphous thin strip, the noble metal layer and the panel are sequentially stacked and assembled into a sandwich structure to obtain an assembly;

[0011] The assembly is placed in a vacuum diffusion furnace, heated to a temperature of 1020-1080° C., and kept warm for 1-30 minutes to obtain a titanium-aluminum / nickel-based high-temperature alloy heterogeneous porous sandwich structure product.

[0012] Furthermore, the noble metal is any one of gold, platinum or palladium.

[0013] Furthermore, the mass of the noble metal layer accounts for 0.5 wt.% to 5 wt.% of the total mass of the solder.

[0014] Furthermore, the thickness of the nickel-based amorphous thin strip is 50 μm to 200 μm.

[0015] Furthermore, the chemical composition of the nickel-based amorphous ribbon includes Cr: 6%-8%, Si: 4%-5%, B:

[0016] 2.75%-3.5%, Fe: 2.5%-3.5%, Ni: balance

[0017] Furthermore, 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 diamond porous structure.

[0018] Furthermore, in a vacuum diffusion furnace, the vacuum degree is less than 3.0×10 -3 After Pa, the temperature was raised to 1020-1080°C at a rate of 20°C / min, kept at that temperature for 1-30min, and then dropped to 600°C at a rate of 5°C / min. The furnace was cooled to room temperature to obtain the product.

[0019] On the other hand, another embodiment of the present invention further provides a titanium aluminum / nickel-based high-temperature alloy heterogeneous porous sandwich structure product, which is prepared by any of the methods described above.

[0020] The present invention has the following beneficial effects:

[0021] The precious metal added according to the above preparation method does not react with other elements in the joint to form a brittle phase. Instead, it is completely dissolved in the nickel matrix in the brazing seam, forming a dispersed distribution, forming a solid solution strengthening effect, and effectively improving the joint strength. At the same time, due to the use of a porous structural layer, the in-plane tensile strength is effectively increased by more than 70%, and the fracture point is shifted from the interface between the core and the faceplate to the middle of the core, effectively improving the mechanical properties of the brazed joint. This effectively solves the problem of severe precipitation and enrichment of a large amount of compounds at the brazing seam interface and the easy formation of dissolution, which leads to performance degradation when brazing a nickel-based high-temperature alloy core and a titanium-aluminum alloy faceplate with nickel-based brazing filler metal in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions and advantages of the embodiments of the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic structural diagram of a product provided by one embodiment of the present invention;

[0024] Figure 2 A flow chart of a method for preparing a titanium-aluminum / nickel-based high-temperature alloy heterogeneous porous sandwich structure provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0025] To further illustrate the technical means and effectiveness of the present invention in achieving its intended purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, describes in detail the specific implementation, structure, features, and effectiveness of a titanium-aluminum / nickel-based high-temperature alloy heterogeneous porous sandwich structure product and preparation method proposed in accordance with the present invention. In the following description, references to different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.

[0026] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0027] The specific scheme of a titanium aluminum / nickel-based high-temperature alloy heterogeneous porous sandwich structure product and a preparation method provided by the present invention is described in detail below with reference to the accompanying drawings.

[0028] See also Figure 1 One embodiment of the present invention provides a titanium-aluminum / nickel-based high-temperature alloy heterogeneous porous sandwich structure product, including a porous structure, a panel, a precious metal and a nickel-based amorphous thin strip.

[0029] Among them, the porous structure, panel, precious metal and nickel-based amorphous strip are stacked in the order of panel 10, precious metal layer 20, nickel-based amorphous strip 30, porous structure layer 40, nickel-based amorphous strip 30, precious metal layer 20 and panel 10.

[0030] The porous structure layer 40 may 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 high-temperature alloy.

[0031] The panel 10 is made of titanium-aluminum alloy.

[0032] The material of the precious metal may be gold, platinum or palladium.

[0033] See also Figure 2 One embodiment of the present invention further provides a method for preparing a titanium-aluminum / nickel-based high-temperature alloy heterogeneous porous sandwich structure, the preparation method comprising the following steps:

[0034] Step S001: Obtain a porous structure, a panel, a precious metal and a nickel-based amorphous thin strip, and place the panel and the porous structure in an acetone solution for cleaning; wherein the porous structure is made of a nickel-based high-temperature alloy.

[0035] The porous structure may be any one of a honeycomb structure, a foam porous structure, a rectangular porous structure, a triangular porous structure and a diamond porous structure, and the material is a nickel-based high-temperature alloy.

[0036] The noble metal used as the target material may be any one of gold, platinum or palladium; the mass of the noble metal layer accounts for 0.5wt.% to 5wt.% of the total mass of the solder.

[0037] The thickness of the nickel-based amorphous ribbon is 50 μm to 200 μm. The nickel-based amorphous ribbon is also called BNi-2 amorphous ribbon. Its chemical composition, calculated by mass percentage, includes Cr: 6%-8%, Si: 4%-5%, B:

[0038] 2.75%-3.5%, Fe: 2.5%-3.5%, Ni: balance

[0039] Among them, the material of the panel is titanium aluminum alloy.

[0040] Specifically, the panel and the porous structure are first subjected to wire-cut electric discharge machining to obtain a panel and a porous core of appropriate size; then the processed panel and the porous core are placed in an acetone solution for ultrasonic cleaning for 10 minutes.

[0041] Step S002: using magnetron sputtering to plate precious metal on the surface to be connected of the panel to form a precious metal layer.

[0042] The surface to be connected of the panel refers to the side that is connected to other structures after the sandwich structure is formed. A precious metal layer is plated on the surface to be connected, and then a sandwich structure is formed with the nickel-based amorphous thin strip and the porous structure layer in sequence.

[0043] Step S003 , stacking and assembling the panel, the noble metal layer, the nickel-based amorphous thin strip, the porous structure layer, the nickel-based amorphous thin strip, the noble metal layer and the panel in this order into a sandwich structure to obtain an assembly.

[0044] Step S004: placing the assembly in a vacuum diffusion furnace, heating the furnace to a temperature of 1020-1080° C., and keeping the temperature for 1-30 minutes to obtain a product.

[0045] Among them, in the vacuum diffusion furnace, the vacuum degree is less than 3.0×10 -3 After Pa, heat it up to 1020-1080℃ at a rate of 20℃ / min, keep it warm for 1-30min, then cool it down to 600℃ at a rate of 5℃ / min, cool it to room temperature with the furnace, and take out the product.

[0046] 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 seam and is dispersed, forming a solid solution strengthening effect, which effectively improves the strength of the joint. Among them, 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, due to the effective increase of the planar tensile strength of the porous structure layer 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 a large amount of compound precipitation and enrichment at the brazing seam interface when brazing a nickel-based high-temperature alloy core and a titanium-aluminum alloy panel with nickel-based brazing filler metal in the prior art, and the easy formation of dissolution leading to performance degradation.

[0047] The technical solution of the present application is not limited to the specific implementation methods given below, but also includes any combination of the specific implementation methods.

[0048] Example 1

[0049] A method for preparing a titanium-aluminum / nickel-based high-temperature alloy heterogeneous porous sandwich structure comprises:

[0050] Obtain porous structures, panels, precious metals, and nickel-based amorphous ribbons. The panel material is TiAl alloy, and the porous structure is a honeycomb structure made of GH3536 nickel-based high-temperature alloy. The dimensions are 40mm × 30mm × 12mm, with a core cell inscribed circle diameter of 1.6mm and a core wall thickness of 0.05mm. Nickel-based amorphous ribbon, also known as BNi-2 amorphous ribbon, measures 40mm × 30mm × 0.1mm.

[0051] The panel and the porous structure are subjected to wire-cut electric discharge machining to obtain a panel and a porous structure of suitable size, and then the processed panel and the porous structure are ultrasonically cleaned in an acetone solution for 10 minutes;

[0052] Gold is plated on the surface of the panel to be connected by magnetron sputtering to form a precious metal layer; the amount of gold added is 2wt.%;

[0053] The panel, the precious metal layer, the nickel-based amorphous ribbon, the porous structure layer, the nickel-based amorphous ribbon, the precious metal layer, and the panel are sequentially stacked and assembled into a sandwich structure to obtain an assembly; wherein the thickness of the nickel-based amorphous ribbon is 100 μm;

[0054] The assembly is placed in a vacuum diffusion furnace. When the vacuum degree is lower than 3.0×10 -3 After Pa, the temperature was raised to 1030°C at a rate of 20°C / min, kept at that temperature for 5 minutes, and then cooled to room temperature with the furnace before taking out the product.

[0055] The test results show that the test achieved the strengthening of the joints of titanium aluminum / nickel-based high-temperature alloy heterogeneous porous sandwich structure products. The joint structure is a typical nickel-based solid solution matrix, dispersed borides are distributed in the brazing seam, gold is completely dissolved in the nickel matrix in the brazing seam and is evenly distributed. The flat tensile strength of the titanium aluminum / nickel-based high-temperature alloy heterogeneous porous sandwich structure is 40.5MPa, and it breaks in the middle of the core, which is 80.8% higher than the strength without adding gold.

[0056] Example 2

[0057] A method for preparing a titanium-aluminum / nickel-based high-temperature alloy heterogeneous porous sandwich structure comprises:

[0058] Obtain porous structures, panels, precious metals, and nickel-based amorphous ribbons. The panel material is TiAl alloy, and the porous structure is a honeycomb structure made of GH3536 nickel-based high-temperature alloy. The dimensions are 40mm × 30mm × 12mm, with a core cell inscribed circle diameter of 1.6mm and a core wall thickness of 0.05mm. Nickel-based amorphous ribbon, also known as BNi-2 amorphous ribbon, measures 40mm × 30mm × 0.1mm.

[0059] The panel and the porous structure are subjected to wire-cut electric discharge machining to obtain a panel and a porous structure of suitable size, and then the processed panel and the porous structure are ultrasonically cleaned in an acetone solution for 10 minutes;

[0060] Platinum is plated on the surface of the panel to be connected by magnetron sputtering to form a precious metal layer; the amount of platinum added is 1wt.%;

[0061] The panel, the precious metal layer, the nickel-based amorphous ribbon, the porous structure layer, the nickel-based amorphous ribbon, the precious metal layer, and the panel are sequentially stacked and assembled into a sandwich structure to obtain an assembly; wherein the thickness of the nickel-based amorphous ribbon is 100 μm;

[0062] The assembly is placed in a vacuum diffusion furnace. When the vacuum degree is lower than 3.0×10 -3 After Pa, the temperature was raised to 1040°C at a rate of 20°C / min, kept at that temperature for 5 minutes, and then cooled to room temperature with the furnace before taking out the product.

[0063] The test results show that the test achieved the strengthening of the joints of titanium aluminum / nickel-based high-temperature alloy heterogeneous porous sandwich structure products. The joint structure is a typical nickel-based solid solution matrix, dispersed borides are distributed in the brazing seam, platinum is completely dissolved in the nickel matrix in the brazing seam and is evenly distributed. The flat tensile strength of the titanium aluminum / nickel-based high-temperature alloy heterogeneous porous sandwich structure is 36.5MPa, most of which are broken in the core, which is 63% higher than the strength without adding platinum.

[0064] Example 3

[0065] A method for preparing a titanium-aluminum / nickel-based high-temperature alloy heterogeneous porous sandwich structure comprises:

[0066] Obtain porous structures, panels, precious metals, and nickel-based amorphous ribbons. The panel material is TiAl alloy, and the porous structure is a honeycomb structure made of GH3536 nickel-based high-temperature alloy. The dimensions are 40mm × 30mm × 12mm, with a core cell inscribed circle diameter of 1.6mm and a core wall thickness of 0.05mm. Nickel-based amorphous ribbon, also known as BNi-2 amorphous ribbon, measures 40mm × 30mm × 0.15mm.

[0067] The panel and the porous structure are subjected to wire-cut electric discharge machining to obtain a panel and a porous structure of suitable size, and then the processed panel and the porous structure are ultrasonically cleaned in an acetone solution for 10 minutes;

[0068] The palladium is plated on the surface of the panel to be connected by magnetron sputtering to form a precious metal layer; the amount of palladium added is 1.5wt.%;

[0069] The panel, the precious metal layer, the nickel-based amorphous ribbon, the porous structure layer, the nickel-based amorphous ribbon, the precious metal layer, and the panel are sequentially stacked and assembled into a sandwich structure to obtain an assembly; wherein the thickness of the nickel-based amorphous ribbon is 100 μm;

[0070] The assembly is placed in a vacuum diffusion furnace. When the vacuum degree is lower than 3.0×10 -3 After Pa, the temperature was raised to 1030°C at a rate of 20°C / min, kept at that temperature for 5 minutes, and then cooled to room temperature with the furnace before taking out the product.

[0071] The test results show that the test achieved the strengthening of the joints of titanium aluminum / nickel-based high-temperature alloy heterogeneous porous sandwich structure products. The joint structure is a typical nickel-based solid solution matrix, dispersed borides are distributed in the brazing seam, palladium is completely dissolved in the nickel matrix in the brazing seam and is evenly distributed. The flat tensile strength of the titanium aluminum / nickel-based high-temperature alloy heterogeneous porous sandwich structure is 33.4MPa, and it breaks at the core. Compared with the strength without adding palladium, it is increased by 49%.

[0072] Example 4

[0073] A method for preparing a titanium-aluminum / nickel-based high-temperature alloy heterogeneous porous sandwich structure comprises:

[0074] Obtain porous structures, panels, precious metals, and nickel-based amorphous ribbons. The panel material is TiAl alloy, and the porous structure is a honeycomb structure made of GH3536 nickel-based high-temperature alloy. The dimensions are 40mm × 30mm × 12mm, with a core cell inscribed circle diameter of 2.6mm and a core wall thickness of 0.05mm. Nickel-based amorphous ribbon, also known as BNi-2 amorphous ribbon, measures 40mm × 30mm × 0.1mm.

[0075] The panel and the porous structure are subjected to wire-cut electric discharge machining to obtain a panel and a porous structure of suitable size, and then the processed panel and the porous structure are ultrasonically cleaned in an acetone solution for 10 minutes;

[0076] Gold is plated on the surface of the panel to be connected by magnetron sputtering to form a precious metal layer; the amount of gold added is 1.5wt.%;

[0077] The panel, the precious metal layer, the nickel-based amorphous ribbon, the porous structure layer, the nickel-based amorphous ribbon, the precious metal layer, and the panel are sequentially stacked and assembled into a sandwich structure to obtain an assembly; wherein the thickness of the nickel-based amorphous ribbon is 100 μm;

[0078] The assembly is placed in a vacuum diffusion furnace. When the vacuum degree is lower than 3.0×10 -3 After Pa, the temperature was raised to 1050°C at a rate of 20°C / min, kept at that temperature for 1 min, and then cooled to room temperature with the furnace before taking out the product.

[0079] The test results show that the test achieved the strengthening of the joints of titanium aluminum / nickel-based high-temperature alloy 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 flat tensile strength of the titanium aluminum / nickel-based high-temperature alloy heterogeneous porous sandwich structure is 20.4MPa, and it breaks in the middle of the core, which is 90.3% higher than the strength without gold addition.

[0080] It should be noted that the order in which the embodiments of the present invention are described above is for illustrative purposes only and does not represent the superiority or inferiority of the embodiments. The above description is of specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps described in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or sequential order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0081] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for preparing a titanium aluminum / nickel-based high-temperature alloy heterogeneous porous sandwich structure, characterized in that: The preparation method comprises the following steps: Obtain a porous structure, a panel, a precious metal, and a nickel-based amorphous ribbon, and place the panel and the porous structure in an acetone solution for cleaning; wherein the porous structure is made of a nickel-based high-temperature alloy, the panel is made of a titanium-aluminum alloy, and 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%, and Ni: balance; Plating the noble metal on the surface to be connected of the panel by magnetron sputtering to form a noble metal layer; The panel, the noble metal layer, the nickel-based amorphous thin strip, the porous structure layer, the nickel-based amorphous thin strip, the noble metal layer and the panel are sequentially stacked and assembled into a sandwich structure to obtain an assembly; The assembly is placed in a vacuum diffusion furnace, heated to a temperature of 1020-1080° C., and kept warm for 1-30 minutes to obtain a titanium-aluminum / nickel-based high-temperature alloy heterogeneous porous sandwich structure product.

2. The method for preparing a titanium-aluminum / nickel-based high-temperature alloy heterogeneous porous sandwich structure according to claim 1, characterized in that: The noble metal is any one of gold, platinum or palladium.

3. The method for preparing a titanium-aluminum / nickel-based high-temperature alloy heterogeneous porous sandwich structure according to claim 1, characterized in that: The mass of the noble metal layer accounts for 0.5 wt.% to 5 wt.% of the total mass of the solder.

4. The method for preparing a titanium-aluminum / nickel-based high-temperature alloy heterogeneous porous sandwich structure according to claim 1, characterized in that: The thickness of the nickel-based amorphous thin strip is 50 μm to 200 μm.

5. The method for preparing a titanium-aluminum / nickel-based high-temperature alloy heterogeneous porous sandwich structure according to claim 1, characterized in that: 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 diamond porous structure.

6. The method for preparing a titanium aluminum / nickel-based high-temperature alloy heterogeneous porous sandwich structure according to claim 1, characterized in that: In the vacuum diffusion furnace, the vacuum degree is less than 3.0×10 -3 After Pa, the temperature was raised to 1020-1080°C at a rate of 20°C / min, kept at that temperature for 1-30min, and then dropped to 600°C at a rate of 5°C / min. The furnace was cooled to room temperature to obtain the product.

7. A titanium aluminum / nickel-based high-temperature alloy heterogeneous porous sandwich structure product, characterized in that: The method according to any one of claims 1 to 6 is used for preparation.

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