A brazing filler metal for improving high-temperature performance of a metal / ceramic brazed joint, a preparation method and application thereof

Abstract

The application relates to an active brazing filler metal for metal / ceramic connection and a preparation method and application thereof, and relates to a brazing filler metal for improving the high-temperature performance of a metal / ceramic brazing joint and a preparation method and application thereof. In order to solve the problem of high-temperature softening in the brazing process of existing ceramic and metal active brazing filler metals, the brazing filler metal is composed of two active foil layers and a three-dimensional nanometer carbon reinforced intermediate layer arranged between the two active foil layers. The preparation method comprises the following steps: mixing metal powder and a solid carbon source, carrying out water bath heating and drying, hot pressing and cutting to obtain a three-dimensional nanometer carbon reinforced intermediate layer foil, and placing the three-dimensional nanometer carbon reinforced intermediate layer foil between the two active foil layers. The brazing filler metal is used for brazing connection of metal and ceramic. The brazing filler metal for improving the high-temperature performance of a metal / ceramic brazing joint can inhibit the generation of brittle compound phases, relieve the residual stress of a joint, and improve the high-temperature mechanical performance and high-temperature strength of the joint.

Description

Technical Field

[0001] This invention relates to a brazing filler metal for improving the high-temperature performance of metal / ceramic brazing joints, its preparation method, and its application. Background Technology

[0002] Ceramic materials possess properties such as high temperature resistance and corrosion resistance, making them widely used in aerospace and other fields. However, due to limitations in manufacturing technology, the bonding of ceramic materials themselves and the bonding of ceramic materials with metals are crucial for expanding the widespread application of ceramic materials. Active brazing is currently an effective method for joining ceramics and metals. The addition of active elements can effectively wet the ceramic base material, resulting in brazed joints with high strength.

[0003] Currently, brazing filler metals used in ceramic brazing include Ag-Cu-Ti, Ag-Cu-In-Ti, Ag-Cu, and Cu-Ti filler metals. Ag-based active filler metals have relatively low welding temperatures, and the operating temperature of the joints generally does not exceed 400℃, which greatly limits the applicability of the brazed joints. Cu-based filler metals offer higher operating temperatures than Ag-based filler metals, but due to the high-temperature softening phenomenon of Cu, the joints still suffer from insufficient high-temperature performance. Therefore, alleviating the high-temperature softening phenomenon of the joint structure and enhancing the high-temperature performance of the joint is crucial. Thus, developing a filler metal suitable for ceramic-metal connections that improves the high-temperature performance of metal / ceramic brazed joints is of paramount importance. Summary of the Invention

[0004] To address the problem of high-temperature softening during the brazing process of existing ceramic and metal active brazing filler metals, this invention proposes a brazing filler metal that improves the high-temperature performance of metal / ceramic brazed joints, along with its preparation method and applications.

[0005] The brazing filler metal of this invention, which improves the high-temperature performance of metal / ceramic brazing joints, consists of two active foil layers and a three-dimensional nano-carbon reinforced intermediate layer disposed between the two active foil layers.

[0006] The active foil layer and the three-dimensional nano-carbon reinforced intermediate layer have the same cross-sectional dimensions. The thickness of the active foil layer is 2-20 μm, and the thickness of the three-dimensional nano-carbon reinforced intermediate layer is 100-500 μm.

[0007] The active foil layer is composed of one or more of the following foils: Ti foil, Zr foil, Hf foil, Cr foil, and V foil. The active foil layer in contact with the metal plays an alloying role, while the active foil layer in contact with the ceramic plays a wetting role.

[0008] The preparation method of the above-mentioned brazing filler metal for improving the high-temperature performance of metal / ceramic brazed joints is carried out according to the following steps:

[0009] Step 1: Weigh the metal powder and solid carbon source, mix the metal powder and solid carbon source and transfer them to a mixture of anhydrous ethanol and deionized water, then transfer them to a water bath for heating and stirring. After thorough mixing, put the mixture into an oven to dry and obtain the dried powder.

[0010] The mass ratio of the metal powder to the solid carbon source is (96-98):(2-4);

[0011] Step 2: The dried powder is hot-pressed at 700℃-900℃ and 50MPa-80MPa for 30min-60min to obtain a three-dimensional nano-carbon reinforced intermediate layer, which is then cut into three-dimensional nano-carbon reinforced intermediate layer foils.

[0012] Step 3: Place a three-dimensional nano-carbon reinforced intermediate foil between two active foil layers to obtain a sandwich structure of brazing filler metal that improves the high-temperature performance of metal / ceramic brazing joints.

[0013] The method for brazing metal and ceramic using the above-mentioned brazing filler metal that improves the high-temperature performance of metal / ceramic brazed joints is carried out according to the following steps: the surfaces of the metal and ceramic to be brazed are ground to remove surface oil and oxides, and after ultrasonic cleaning, the brazing filler metal that improves the high-temperature performance of metal / ceramic brazed joints is placed between the surfaces of the metal and ceramic to be brazed to obtain the workpiece to be brazed, and the brazing connection is performed, thus completing the process; the brazing connection process is as follows: first, heat to 800℃-850℃ at a rate of 5-15℃ / min and hold for 5-10min, then heat to 930-990℃ at a rate of 5-10℃ / min and hold for 5-90min, and then cool down to 190-210℃ at a rate of 5-20℃ / min.

[0014] The principle and beneficial technical effects of this invention are as follows:

[0015] 1. The proportion of active elements in the brazing filler metal of the present invention is controllable. By adjusting the proportion of active elements in the brazing filler metal, the generation of brittle compound phases in the brazing seam can be effectively suppressed.

[0016] 2. The addition of active elements in this invention can lower the melting point of the brazing filler metal and reduce the connection temperature; the presence of active elements can effectively wet the ceramic base material.

[0017] 3. Compared to traditional eutectic brazing alloys or composite foil active brazing alloys, the brazing alloy of this invention significantly improves the high-temperature mechanical properties of the joint. The three-dimensional network nano-carbon structure can support the intermediate layer matrix at high temperatures, thereby resisting the high-temperature softening phenomenon of the intermediate layer, enhancing the high-temperature strength of the active brazing alloy, and thus improving the high-temperature strength of the joint. The three-dimensional nano-carbon reinforced copper foil in the composite active brazing alloy has good plasticity and can alleviate residual stress in the joint.

[0018] 4. The present invention uses vacuum or a protective gas environment for welding, which can eliminate the adverse effects of air on the performance of the welded joint, reduce the formation of oxides at the joint, and obtain a welded joint with excellent performance.

[0019] 5. The brazing filler metal of this invention is formed by stacking foil sheets, which facilitates assembly, allows for better control of weld width, and is more suitable for actual production. Attached Figure Description

[0020] Figure 1 A micrograph of copper powder particles uniformly coated with sucrose obtained in step one of Example 1;

[0021] Figure 2 A micrograph of the three-dimensional carbon nanofiber reinforced interlayer foil obtained in step two of Example 1;

[0022] Figure 3 This is a micrograph of the three-dimensional nano-carbon reinforced intermediate layer foil obtained in step two of Example 1 after being etched with FeCl3 solution;

[0023] Figure 4 A micrograph of the welded joint obtained in Example 1;

[0024] Figure 5 A micrograph of the welded joint obtained in Example 2;

[0025] Figure 6 This is a comparison chart of the high-temperature performance of the welded joints obtained in Example 2. Detailed Implementation

[0026] The technical solution of the present invention is not limited to the specific embodiments listed below, but also includes any reasonable combination of the specific embodiments.

[0027] Specific implementation method one: The brazing filler metal for improving the high-temperature performance of metal / ceramic brazing joints in this implementation method consists of two active foil layers and a three-dimensional nano-carbon reinforced intermediate layer disposed between the two active foil layers;

[0028] The active foil layer and the three-dimensional nano-carbon reinforced intermediate layer have the same cross-sectional dimensions. The thickness of the active foil layer is 2-20 μm, and the thickness of the three-dimensional nano-carbon reinforced intermediate layer is 100-500 μm.

[0029] The active foil layer is composed of one or more foils selected from Ti foil, Zr foil, Hf foil, Cr foil, V foil, etc. The active foil layer in contact with the metal plays an alloying role, while the active foil layer in contact with the ceramic plays a wetting role.

[0030] This embodiment has the following beneficial effects:

[0031] 1. In this embodiment, the proportion of active elements in the brazing filler metal is controllable. By adjusting the proportion of active elements in the brazing filler metal, the generation of brittle compound phases in the brazing seam can be effectively suppressed.

[0032] 2. In this embodiment, the addition of active elements can lower the melting point of the brazing filler metal and reduce the connection temperature; the presence of active elements can effectively wet the ceramic base material.

[0033] 3. Compared to traditional eutectic brazing filler metals or composite foil active brazing filler metals, the brazing filler metal of this embodiment can significantly improve the high-temperature mechanical properties of the joint. The three-dimensional network nano-carbon structure can support the intermediate layer matrix at high temperatures, thereby resisting the high-temperature softening phenomenon of the intermediate layer, enhancing the high-temperature strength of the active brazing filler metal, and thus improving the high-temperature strength of the joint. The three-dimensional nano-carbon reinforced copper foil in the composite active brazing filler metal has good plasticity and can alleviate residual stress in the joint.

[0034] 4. In this embodiment, the brazing filler metal is formed by stacking foil sheets, which facilitates assembly, allows for better control of the weld width, and is more suitable for actual production.

[0035] Specific Implementation Method Two: The preparation method of the brazing filler metal for improving the high-temperature performance of metal / ceramic brazing joints in this implementation method is carried out according to the following steps:

[0036] Step 1: Weigh the metal powder and solid carbon source, mix the metal powder and solid carbon source and transfer them to a mixture of anhydrous ethanol and deionized water, then transfer them to a water bath for heating and stirring. After thorough mixing, put the mixture into an oven to dry and obtain the dried powder.

[0037] The mass ratio of the metal powder to the solid carbon source is (96-98):(2-4);

[0038] Step 2: The dried powder is hot-pressed at 700℃-900℃ and 50MPa-80MPa for 30min-60min to obtain a three-dimensional nano-carbon reinforced intermediate layer, which is then cut into three-dimensional nano-carbon reinforced intermediate layer foils.

[0039] Step 3: Place a three-dimensional nano-carbon reinforced intermediate foil between two active foil layers to obtain a sandwich structure of brazing filler metal that improves the high-temperature performance of metal / ceramic brazing joints.

[0040] 1. In this embodiment, the proportion of active elements in the brazing filler metal is controllable. By adjusting the proportion of active elements in the brazing filler metal, the generation of brittle compound phases in the brazing seam can be effectively suppressed.

[0041] 2. In this embodiment, the addition of active elements can lower the melting point of the brazing filler metal and reduce the connection temperature; the presence of active elements can effectively wet the ceramic base material.

[0042] 3. Compared to traditional eutectic brazing filler metals or composite foil active brazing filler metals, the brazing filler metal of this embodiment can significantly improve the high-temperature mechanical properties of the joint. The three-dimensional network nano-carbon structure can support the intermediate layer matrix at high temperatures, thereby resisting the high-temperature softening phenomenon of the intermediate layer, enhancing the high-temperature strength of the active brazing filler metal, and thus improving the high-temperature strength of the joint. The three-dimensional nano-carbon reinforced copper foil in the composite active brazing filler metal has good plasticity and can alleviate residual stress in the joint.

[0043] 4. In this embodiment, the brazing filler metal is formed by stacking foil sheets, which facilitates assembly, allows for better control of the weld width, and is more suitable for actual production.

[0044] Specific Implementation Method 3: This implementation method differs from Specific Implementation Method 2 in that the metal powder mentioned in step one is Cu powder, Fe powder, Co powder, or Ni powder, etc.

[0045] Specific Implementation Method Four: This implementation method differs from Specific Implementation Method Two in that the mass ratio of the metal powder in step one to the volume ratio of anhydrous ethanol is (3-10) g: (10-50) mL.

[0046] Specific Implementation Method 5: This implementation method differs from Specific Implementation Method 2 in that the volume ratio of anhydrous ethanol and deionized water in step one is 1:(2-3).

[0047] Specific Implementation Method Six: This implementation method differs from Specific Implementation Method Two in that the water bath temperature in step one is 60℃-80℃.

[0048] Specific Implementation Method Seven: This implementation method differs from Specific Implementation Method Two in that the drying temperature in step one is 80℃-100℃.

[0049] Specific Implementation Method Eight: This implementation method differs from Specific Implementation Method Two in that the particle size of the metal powder mentioned in Step One is 1-50μm.

[0050] Specific Implementation Method Nine: This implementation method uses a brazing filler metal that improves the high-temperature performance of metal / ceramic brazing joints to braze metals and ceramics.

[0051] The method for brazing metal and ceramic is carried out according to the following steps: the surfaces of the metal and ceramic to be brazed are ground to remove surface oil and oxides, and after ultrasonic cleaning, brazing filler metal that improves the high-temperature performance of the metal / ceramic brazing joint is placed between the surfaces of the metal and ceramic to be brazed to obtain the workpiece to be brazed, and then brazing is performed to complete the process; the brazing process is as follows: first, heat to 800℃-850℃ at a rate of 5-15℃ / min and hold for 5-10min, then heat to 930-990℃ at a rate of 5-10℃ / min and hold for 5-90min, and then cool down to 190-210℃ at a rate of 5-20℃ / min.

[0052] 1. In this embodiment, the proportion of active elements in the brazing filler metal is controllable. By adjusting the proportion of active elements in the brazing filler metal, the generation of brittle compound phases in the brazing seam can be effectively suppressed.

[0053] 2. In this embodiment, the addition of active elements can lower the melting point of the brazing filler metal and reduce the connection temperature; the presence of active elements can effectively wet the ceramic base material.

[0054] 3. Compared to traditional eutectic brazing filler metals or composite foil active brazing filler metals, the brazing filler metal of this embodiment can significantly improve the high-temperature mechanical properties of the joint. The three-dimensional network nano-carbon structure can support the intermediate layer matrix at high temperatures, thereby resisting the high-temperature softening phenomenon of the intermediate layer, enhancing the high-temperature strength of the active brazing filler metal, and thus improving the high-temperature strength of the joint. The three-dimensional nano-carbon reinforced copper foil in the composite active brazing filler metal has good plasticity and can alleviate residual stress in the joint.

[0055] 4. This embodiment uses vacuum or a protective gas environment for welding, which can eliminate the adverse effects of air on the performance of the welded joint, reduce the formation of oxides at the joint, and obtain a welded joint with excellent performance.

[0056] 5. In this embodiment, the brazing filler metal is formed by stacking foil sheets, which facilitates assembly, allows for better control of the weld width, and is more suitable for actual production.

[0057] Specific Implementation Method Ten: This implementation method differs from Specific Implementation Method Nine in that: the metal is an iron-based high-temperature alloy, a nickel-based high-temperature alloy, a cobalt-based high-temperature alloy, a TiAl alloy, or an Invar alloy; the ceramic is a MAX phase ceramic, an oxide ceramic, a carbide ceramic, a nitride ceramic, or a boride ceramic.

[0058] Example 1:

[0059] This embodiment utilizes a brazing filler metal that enhances the high-temperature performance of metal / ceramic brazing joints to braze Ti3SiC2 ceramics and metallic Nb. The method is carried out according to the following steps: the surfaces of Ti3SiC2 ceramics and metallic Nb to be brazed are ground to remove surface oil and oxides. After ultrasonic cleaning, the brazing filler metal that enhances the high-temperature performance of metal / ceramic brazing joints is placed between the surfaces of Ti3SiC2 ceramics and metallic Nb to be brazed to obtain the workpiece to be brazed. The workpiece is heated to 850°C at a rate of 10°C / min and held for 5 min. Then it is heated to 970°C at a rate of 5°C / min and held for 10 min. Finally, it is cooled to 200°C at a rate of 10°C / min.

[0060] The brazing filler metal for improving the high-temperature performance of the metal / ceramic brazing joint consists of two layers of Ti foil and a three-dimensional nano-carbon reinforced intermediate layer foil disposed between the two layers of Ti foil; the Ti foil and the three-dimensional nano-carbon reinforced intermediate layer foil have the same cross-sectional dimensions, the thickness of the Ti foil is 2μm, and the thickness of the three-dimensional nano-carbon reinforced intermediate layer foil is 200μm;

[0061] The method for preparing the brazing filler metal that improves the high-temperature performance of the metal / ceramic brazed joint is carried out according to the following steps:

[0062] Step 1: Weigh copper powder and sucrose, mix the copper powder and sucrose and transfer them to a mixture of anhydrous ethanol and deionized water. Then transfer the mixture to a water bath, heat and stir. After mixing thoroughly, put the mixture into an oven to dry, and obtain the dried powder.

[0063] The copper powder has a particle size of 1-50 μm;

[0064] The mass ratio of copper powder to sucrose is 96:4;

[0065] The mass ratio of the copper powder to the volume of anhydrous ethanol is 5g:20mL.

[0066] The volume ratio of anhydrous ethanol to deionized water is 1:2;

[0067] The water bath temperature is 60℃;

[0068] The drying temperature is 80℃;

[0069] Step 2: The dried powder is hot-pressed at 800℃ and 50MPa for 30 minutes to obtain a three-dimensional nano-carbon reinforced intermediate layer, which is then cut into three-dimensional nano-carbon reinforced intermediate layer foils.

[0070] The hot pressing process is carried out in a plasma sintering hot pressing furnace;

[0071] The atmosphere for hot pressing is a vacuum;

[0072] Step 3: Place a three-dimensional nano-carbon reinforced intermediate foil between two Ti foils to obtain a sandwich structure of brazing filler metal that improves the high-temperature performance of metal / ceramic brazing joints.

[0073] Figure 1 A micrograph of copper powder particles uniformly coated with sucrose obtained in step one of Example 1; Figure 2 A micrograph of the three-dimensional carbon nanofiber reinforced interlayer foil obtained in step two of Example 1; Figure 3 This is a micrograph of the three-dimensional nano-carbon reinforced intermediate layer foil obtained in step two of Example 1 after being etched with FeCl3 solution; Figure 4 A micrograph of the welded joint obtained in Example 1; Figure 1It can be seen that sucrose is evenly coated on the surface of copper powder and has close contact, which helps to form amorphous carbon during hot pressing. Then, Cu catalyzes the connection between the layers to form a three-dimensional network carbon structure. Figure 2 It can be seen that the three-dimensional reinforcing phase is uniformly distributed in the matrix; Figure 3 This demonstrates the uniformity of the three-dimensional network of nano-carbon structures and their supporting role in the matrix; Figure 4 It can be seen that there are no Cu-Ti brittle compounds in the joint structure, and a three-dimensional network of nano-carbon reinforcing phase can be seen in the joint structure.

[0074] Example 2:

[0075] This embodiment utilizes a brazing filler metal that enhances the high-temperature performance of metal / ceramic brazing joints to braze Ti3SiC2 ceramics and Nb metals, which are then brazed according to the following steps: The surfaces of Ti3SiC2 ceramics and Nb metals to be brazed are ground to remove surface oil and oxides, and after ultrasonic cleaning, the brazing filler metal that enhances the high-temperature performance of metal / ceramic brazing joints is placed between the surfaces of Ti3SiC2 ceramics and Nb metals to be brazed to obtain the workpiece to be brazed. The workpiece is then heated to 850°C at a rate of 10°C / min and held for 5 min, then heated to 970°C at a rate of 5°C / min and held for 10 min, and then cooled to 200°C at a rate of 10°C / min.

[0076] The brazing filler metal for improving the high-temperature performance of metal / ceramic brazing joints consists of two layers of Ti foil and a three-dimensional nano-carbon reinforced intermediate layer foil disposed between the two layers of Ti foil; the Ti foil and the three-dimensional nano-carbon reinforced intermediate layer foil have the same cross-sectional dimensions, the thickness of the Ti foil is 10 μm, and the thickness of the three-dimensional nano-carbon reinforced intermediate layer foil is 200 μm.

[0077] The method for preparing the brazing filler metal that improves the high-temperature performance of the metal / ceramic brazed joint is carried out according to the following steps:

[0078] Step 1: Weigh copper powder and sucrose, mix the copper powder and sucrose and transfer them to a mixture of anhydrous ethanol and deionized water. Then transfer the mixture to a water bath, heat and stir. After mixing thoroughly, put the mixture into an oven to dry, and obtain the dried powder.

[0079] The copper powder has a particle size of 1-50 μm;

[0080] The mass ratio of copper powder to sucrose is 96:4;

[0081] The mass ratio of the copper powder to the volume of anhydrous ethanol is 5g:20mL.

[0082] The volume ratio of anhydrous ethanol to deionized water is 1:2;

[0083] The water bath temperature is 60℃;

[0084] The drying temperature is 80℃;

[0085] Step 2: The dried powder is hot-pressed at 800℃ and 50MPa for 30 minutes to obtain a three-dimensional nano-carbon reinforced intermediate layer, which is then cut into three-dimensional nano-carbon reinforced intermediate layer foils.

[0086] The hot pressing process is carried out in a plasma sintering hot pressing furnace;

[0087] The atmosphere for hot pressing is a vacuum;

[0088] Step 3: Place a three-dimensional nano-carbon reinforced intermediate foil between two Ti foils to obtain a sandwich structure of brazing filler metal that improves the high-temperature performance of metal / ceramic brazing joints.

[0089] Comparative example:

[0090] The surfaces of Ti3SiC2 ceramic and metallic Nb to be soldered are ground to remove surface oil and oxides. After ultrasonic cleaning, the composite active solder is placed between the surfaces of Ti3SiC2 ceramic and metallic Nb to be soldered to obtain the solderable parts, and then brazed to complete the connection. The brazing process is as follows: first, heat to 850℃ at a rate of 10℃ / min and hold for 5min, then heat to 970℃ at a rate of 5℃ / min and hold for 10min, and then cool down to 200℃ at a rate of 10℃ / min. The composite active solder is prepared by hot pressing copper powder at 800℃ and 50MPa for 30min to obtain copper foil. The copper foil is placed between two layers of Ti foil to obtain the composite active solder.

[0091] Figure 5 This is a micrograph of the welded joint obtained in Example 2. Figure 5 It can be seen that the joint structure contains a very small amount of Cu-Ti brittle compounds, and a three-dimensional network of nano-carbon reinforcing phase can be seen in the joint structure. Figure 6 This is a comparison chart of the high-temperature performance of the welded joints obtained in Example 2; Figure 6 Curve 1 shows the welded joint obtained in the example, with a shear strength of 130 MPa; Curve 2 shows the welded joint obtained in the comparative example, where the composite active brazing filler metal used in the connection process does not contain nano-carbon reinforcing phase. Figure 6 This demonstrates that the addition of nano-carbon improves the high-temperature performance of the active solder and significantly reduces the softening phenomenon of the active solder during the connection process.

Claims

1. A brazing filler metal for improving the high-temperature performance of metal / ceramic brazing joints, characterized in that: The brazing filler metal for improving the high-temperature performance of metal / ceramic brazed joints consists of two active foil layers and a three-dimensional nano-carbon reinforced intermediate layer disposed between the two active foil layers; The active foil layer and the three-dimensional nano-carbon reinforced intermediate layer have the same cross-sectional dimensions. The thickness of the active foil layer is 2-20 μm, and the thickness of the three-dimensional nano-carbon reinforced intermediate layer is 100-500 μm. The active foil layer is composed of one or more of the following foils: Ti foil, Zr foil, Hf foil, Cr foil, and V foil. The method for preparing the brazing filler metal that improves the high-temperature performance of metal / ceramic brazed joints is carried out according to the following steps: Step 1: Weigh the metal powder and solid carbon source, mix the metal powder and solid carbon source and transfer them to a mixture of anhydrous ethanol and deionized water, then transfer them to a water bath for heating and stirring. After thorough mixing, put the mixture into an oven to dry and obtain the dried powder. The mass ratio of the metal powder to the solid carbon source is (96-98):(2-4). Step 2: The dried powder is hot-pressed at 700℃-900℃ and 50MPa-80MPa for 30min-60min to obtain a three-dimensional nano-carbon reinforced intermediate layer, which is then cut into three-dimensional nano-carbon reinforced intermediate layer foils. Step 3: Place a three-dimensional nano-carbon reinforced intermediate foil between two active foil layers to obtain a sandwich structure of brazing filler metal that improves the high-temperature performance of metal / ceramic brazing joints; The metal powder mentioned in step one is Cu powder, Fe powder, Co powder, or Ni powder.

2. The brazing filler metal for improving the high-temperature performance of metal / ceramic brazed joints according to claim 1, characterized in that: The mass ratio of the metal powder to the volume of anhydrous ethanol in step one is (3-10) g: (10-50) mL.

3. The brazing filler metal for improving the high-temperature performance of metal / ceramic brazed joints according to claim 1, characterized in that: The volume ratio of anhydrous ethanol to deionized water in step one is 1:(2-3).

4. The brazing filler metal for improving the high-temperature performance of metal / ceramic brazed joints according to claim 1, characterized in that: The water bath temperature in step one is 60℃-80℃.

5. The brazing filler metal for improving the high-temperature performance of metal / ceramic brazing joints according to claim 1, characterized in that: The drying temperature described in step one is 80℃-100℃.

6. The brazing filler metal for improving the high-temperature performance of metal / ceramic brazing joints according to claim 1, characterized in that: The particle size of the metal powder mentioned in step one is 1-50 μm.

7. The application of a brazing filler metal as described in claim 1 for improving the high-temperature performance of metal / ceramic brazed joints, characterized in that: Brazing filler metals are used to improve the high-temperature performance of metal / ceramic brazed joints for brazing connections between metals and ceramics.

8. The application according to claim 7, characterized in that: The metal is an iron-based high-temperature alloy, a nickel-based high-temperature alloy, a cobalt-based high-temperature alloy, a TiAl alloy, or an Invar alloy; the ceramic is a MAX phase ceramic, an oxide ceramic, a carbide ceramic, a nitride ceramic, or a boride ceramic.

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