High-entropy alloy brazing filler metal for brazing high-nitrogen steel and tungsten alloy as well as preparation method and application of high-entropy alloy brazing filler metal

Abstract

The invention relates to the technical field of welding, in particular to high-entropy alloy brazing filler metal for high-nitrogen steel and tungsten alloy brazing and a preparation method and application of the high-entropy alloy brazing filler metal. The high-entropy alloy brazing filler metal for brazing the high-nitrogen steel and the tungsten alloy comprises the following components in atomic percent: 18%-32% of Ag, 12%-24% of Cu, 15%-25% of Mn, 15%-25% of Ni and the balance of Ti. According to the high-entropy alloy brazing filler metal for brazing of the high-nitrogen steel and the tungsten alloy, the phenomenon that intermetallic compounds and nitrogen overflow in a high-nitrogen steel / tungsten alloy brazing joint can be reduced, and the quality of the brazing joint is improved.

Description

Technical Field

[0001] The invention relates to the technical field of welding, and in particular to a high entropy alloy brazing filler metal for brazing high nitrogen steel and tungsten alloy, and a preparation method and application thereof. Background Art

[0002] High nitrogen steel has the advantages of high hardness, high wear resistance, high strength, and low magnetic permeability, and thus has become an important material for livelihood industries such as electricity, rail transportation, and construction, as well as large-scale high-end equipment manufacturing industries such as mineral processing and mining, ships, superconducting materials, and nuclear industry. Tungsten alloy is a two-phase composite material composed of tungsten phase and bonding phase. It has the characteristics of high strength, high density, good thermal conductivity, high melting point, high sputtering resistance, and low tritium retention. Therefore, it is widely used in military industry, aerospace, nuclear industry, and civilian industry. However, tungsten alloy has the disadvantages of high cost, high density, and difficult processing, which is not conducive to lightweighting and cost reduction. It is often used in connection with steel structural materials in industrial applications. Therefore, the research on the brazing connection of tungsten alloy and high nitrogen steel has important application value.

[0003] Since tungsten and tungsten alloys have large differences in melting point and thermal expansion coefficient with steel, and intermetallic compounds are easily generated in brazed joints to reduce joint strength, there are only a few studies on tungsten / steel brazing. The prior art discloses a vacuum electron beam brazing connection method for tungsten / low-activated steel. Although the titanium element in the brazing material has good miscibility with tungsten, it is easy to produce metal compounds with iron, and nitrogen overflow will occur in high-nitrogen steel at high temperatures, which may have an adverse effect on joint performance. High entropy alloys have great potential as brazing materials for dissimilar metal welding due to the synergistic effect of high entropy effect and hysteresis diffusion effect. The use of high entropy alloys to braze high nitrogen steel and tungsten can inhibit the formation of brittle intermetallic compounds at the interface, reduce nitrogen overflow, and thus improve the quality of the welded joint.

[0004] At present, most of the research on tungsten / steel brazing focuses on the use of traditional brazing filler metals to braze tungsten alloys and steel, but there is little research on the use of high entropy alloy brazing filler metals to braze tungsten alloys and steel. Based on this, it is urgent to develop relevant high entropy alloy brazing filler metals and their preparation methods to improve the research on tungsten / steel dissimilar connection and improve production efficiency and product quality.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] In view of the deficiencies or improvement needs of the above-mentioned prior art, the present invention combines the characteristics and performance of the high entropy alloy itself to provide a high entropy alloy brazing filler metal for brazing high nitrogen steel and tungsten alloy, and its preparation method and application. The high entropy alloy brazing filler metal can reduce the overflow of intermetallic compounds and nitrogen in the high nitrogen steel / tungsten alloy brazing joint, so as to solve the technical problems existing in the existing high nitrogen steel / tungsten alloy brazing field proposed in the above-mentioned background technology.

[0007] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are particularly adopted:

[0008] One aspect of the present invention relates to a high entropy alloy brazing material for brazing high nitrogen steel and tungsten alloy, which comprises the following components in atomic percentage:

[0009] Ag 18%-32%, Cu 12%-24%, Mn 15%-25%, Ni 15%-25% and the balance Ti.

[0010] The high entropy alloy brazing filler metal for brazing high nitrogen steel and tungsten alloy can reduce the intermetallic compound and nitrogen overflow phenomenon in the high nitrogen steel / tungsten alloy brazing joint and improve the quality of the welding joint.

[0011] Another aspect of the present invention also relates to a method for preparing a high entropy alloy brazing filler metal for brazing high nitrogen steel and tungsten alloy, comprising the following steps:

[0012] After mixing all the raw materials, they are melted and formed.

[0013] The method for preparing the high entropy alloy brazing filler metal for brazing high nitrogen steel and tungsten alloy is simple, easy to operate, does not rely on complex processes or equipment, and is suitable for mass production. The prepared high entropy alloy brazing filler metal can reduce the overflow of intermetallic compounds and nitrogen in the high nitrogen steel / tungsten alloy brazing joint, and improve the quality of the welded joint.

[0014] Another aspect of the present invention also relates to the use of the high entropy alloy brazing filler metal for brazing high nitrogen steel and tungsten alloy or the high entropy alloy prepared by the preparation method of the high entropy alloy for brazing high nitrogen steel and tungsten alloy in brazing high nitrogen steel and tungsten alloy.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) The high entropy alloy brazing material for brazing high nitrogen steel and tungsten alloy provided by the present invention has a suitable melting temperature, good high temperature performance, and uniform metallographic structure. It can effectively avoid the defects such as nitrogen content loss of high nitrogen steel, precipitation of nitride or brittle phase, and welding porosity in traditional welding by performing tungsten / steel dissimilar brazing connection.

[0017] (2) The high entropy effect and hysteresis diffusion effect of the high entropy alloy brazing filler metal for brazing high nitrogen steel and tungsten alloy provided by the present invention have a significant inhibitory effect on the mutual diffusion between the base material and the brazing filler metal and the production of brittle intermetallic compounds in the joint during the brazing process, thereby improving the strength of the weld and the high temperature performance of the joint.

[0018] (3) The high entropy alloy brazing material for brazing high nitrogen steel and tungsten alloy provided by the present invention does not contain precious metals such as Au and Pd, and has a simple preparation process and low cost, and has good economic and practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 The DSC test curve diagram of the high entropy alloy solder of Example 1;

[0021] Figure 2 The microstructure diagram of the high entropy alloy solder of Example 1;

[0022] Figure 3 This is the EDS surface scan result of the high entropy alloy solder of Example 1;

[0023] Figure 4 This is the microstructure result diagram of the high nitrogen steel and tungsten alloy brazing joint in Example 1. DETAILED DESCRIPTION

[0024] The technical scheme of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments, but it will be understood by those skilled in the art that the following described embodiments are part of embodiments of the present invention, rather than all embodiments, and are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention. If specific conditions are not specified in the embodiments, they are carried out according to normal conditions or conditions recommended by the manufacturer. If the manufacturer is not specified in the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0025] One aspect of the present invention relates to a high entropy alloy brazing material for brazing high nitrogen steel and tungsten alloy, which comprises the following components in atomic percentage:

[0026] Ag 18%-32%, Cu 12%-24%, Mn 15%-25%, Ni 15%-25% and the balance Ti.

[0027] In some specific embodiments, in terms of atomic percentage, Ag can be, for example, but not limited to, 18%, 20%, 22%, 24%, 26%, 28%, 30% or 32%.

[0028] In some specific embodiments, the Cu content, by atomic percentage, may be, for example, but not limited to, 12%, 14%, 16%, 18%, 20%, 22% or 24%.

[0029] In some specific embodiments, the Mn content, by atomic percentage, may be, for example, but not limited to, 15%, 17%, 19%, 21%, 23% or 25%.

[0030] In some specific embodiments, Ni can be, for example, but not limited to, 15%, 17%, 19%, 21%, 23% or 25% by atomic percentage.

[0031] The present invention firstly selects the main constituent elements of a high entropy alloy solder, then draws on the high entropy alloy design theory to design and prepare a multi-component high entropy alloy solder with high entropy characteristics, thereby ensuring that the solder has a microstructure dominated by a solid solution, and at the same time controls the reaction between the high entropy alloy solder and the base material, reduces the formation of brittle compounds during the welding process, and obtains a weld structure dominated by a solid solution.

[0032] The atomic ratio of the high entropy alloy solder of the present invention must meet the high entropy alloy design criteria, namely, the mixing enthalpy (ΔH mix ) satisfies -20kJ / mol≤ΔH mix ≤5kJ / mol, mixing entropy (ΔS mix ) satisfies 11kJ / mol≤ΔS mix ≤19.5 kJ / mol, and the atomic size difference (δ) satisfies δ≤6.6%.

[0033] The high entropy alloy brazing filler metal for brazing high nitrogen steel and tungsten alloy of the present invention has a suitable melting temperature, good high temperature performance, and uniform metallographic structure. It can effectively avoid the defects such as nitrogen content loss of high nitrogen steel, precipitation of nitride or brittle phase, and welding porosity in traditional welding by performing tungsten / steel dissimilar brazing connection.

[0034] The high entropy alloy brazing filler metal for brazing high nitrogen steel and tungsten alloy of the present invention is suitable for brazing links between all high nitrogen steels and tungsten alloys.

[0035] The high entropy effect and hysteresis diffusion effect of the high entropy alloy brazing filler metal for brazing high nitrogen steel and tungsten alloy of the present invention have a significant inhibitory effect on the mutual diffusion of the base material and the brazing filler metal and the generation of brittle intermetallic compounds in the joint during the brazing process, thereby improving the strength of the weld and the high temperature performance of the joint.

[0036] The Ag and Cu in the high entropy alloy brazing material for brazing high nitrogen steel and tungsten alloy of the present invention function to reduce the melting temperature of the brazing material and improve the strength and plasticity of the brazed joint.

[0037] The Ti in the high entropy alloy brazing filler metal for brazing high nitrogen steel and tungsten alloy of the present invention can enhance and improve the wettability and fluidity of the brazing filler metal, and improve the quality of the brazing joint.

[0038] The Ni in the high entropy alloy brazing material for brazing high nitrogen steel and tungsten alloy of the present invention can improve the connection strength and corrosion resistance of the brazing joint.

[0039] The Mn in the high entropy alloy brazing filler metal for brazing high nitrogen steel and tungsten alloy of the present invention can improve the hardness of the brazing filler metal, promote grain refinement, and improve strength and toughness.

[0040] Furthermore, the high entropy alloy brazing material for brazing high nitrogen steel and tungsten alloy comprises the following components in atomic percentage:

[0041] Ag 20%-30%, Cu 15%-20%, Mn 15%-25%, Ni 15%-25% and the balance Ti.

[0042] Furthermore, the raw materials of the high entropy alloy brazing filler metal for brazing high nitrogen steel and tungsten alloy are pure Ag, pure Cu, pure Mn, pure Ni and pure Ti, and the purity of the raw materials is ≥99.9%.

[0043] Furthermore, the high entropy alloy brazing material for brazing high nitrogen steel and tungsten alloy includes: amorphous high entropy brazing material foil or high entropy alloy brazing material sheet. The high entropy alloy brazing material has uniform composition, is easy to assemble, can meet most brazing scenarios, and can better control the brazing seam width. It is an ideal brazing material suitable for mass production.

[0044] Furthermore, the thickness of the amorphous high entropy solder foil is 100-150 μm.

[0045] In some specific embodiments, the thickness of the amorphous high entropy solder foil may be, for example, but not limited to, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm or 150 μm.

[0046] Furthermore, the thickness of the high entropy alloy solder sheet is 150-300 μm.

[0047] In some specific embodiments, the thickness of the high entropy alloy brazing sheet may be, for example, but not limited to, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm, 200 μm, 210 μm, 220 μm, 230 μm, 240 μm, 250 μm, 260 μm, 270 μm, 280 μm, 290 μm or 300 μm.

[0048] The thickness of the amorphous high-entropy solder foil and the high-entropy alloy solder sheet is limited within a certain range, so that the composition of the solder is more uniform, which is convenient for assembly, can meet most brazing scenarios, and can better control the width of the brazing seam.

[0049] Another aspect of the present invention also relates to a method for preparing a high entropy alloy brazing filler metal for brazing high nitrogen steel and tungsten alloy, comprising the following steps:

[0050] After mixing all the raw materials, they are melted and formed.

[0051] The preparation method of the high entropy alloy brazing filler metal for brazing high nitrogen steel and tungsten alloy is simple and easy to operate, does not rely on complex processes or equipment, and is suitable for mass production. The prepared high entropy alloy brazing filler metal can reduce the intermetallic compound and nitrogen overflow phenomenon in the high nitrogen steel / tungsten alloy brazing joint, and improve the quality of the welded joint.

[0052] Furthermore, the melting temperature is 1080-1100° C. This melting temperature can ensure that the raw materials of the high entropy alloy solder are fully melted, and the obtained solder has good welding performance.

[0053] In some specific embodiments, the smelting temperature may be, for example, but not limited to, 1080°C, 1085°C, 1090°C, 1095°C or 1100°C.

[0054] Furthermore, the smelting is performed 4 to 6 times.

[0055] In some specific embodiments, the smelting may be performed, for example, but not limited to, 4, 5 or 6 times.

[0056] Furthermore, the smelting method includes but is not limited to: at least one of vacuum arc melting, arc melting under argon protective atmosphere, vacuum induction melting or electromagnetic suspension melting.

[0057] Furthermore, the forming specifically includes: using a single-roll strip-spinning method to rapidly cool and solidify the smelted solder ingot into an amorphous high-entropy solder foil, or using an electric spark wire cutting machine to cut, grind and clean the smelted solder ingot to obtain a high-entropy alloy solder sheet.

[0058] Another aspect of the present invention also relates to the high entropy alloy brazing filler metal for brazing high nitrogen steel and tungsten alloy or the preparation method of the high entropy alloy for brazing high nitrogen steel and tungsten alloy, and the application of the high entropy alloy in brazing high nitrogen steel and tungsten alloy.

[0059] Furthermore, the brazing temperature is 1130-1170°C.

[0060] In some specific embodiments, the brazing temperature may be, for example, but not limited to, 1130°C, 1135°C, 1140°C, 1145°C, 1150°C, 1155°C, 1160°C, 1165°C or 1170°C.

[0061] The embodiments of the present invention will be described in detail below in conjunction with the examples, but it will be appreciated by those skilled in the art that the following examples are only used to illustrate the present invention and should not be considered as limiting the scope of the present invention. If no specific conditions are specified in the examples, the conditions are carried out according to normal conditions or the conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be obtained commercially.

[0062] Example 1

[0063] The method for preparing a high entropy alloy brazing material for brazing high nitrogen steel and tungsten alloy provided in this embodiment comprises the following steps:

[0064] Step 1: Convert the atomic percentage of AgCuTiNiMn high entropy alloy solder into mass percentage, i.e., Ag 32.40 Cu 19.09 Ti 14.38 Ni 17.63 Mn 16.50 , then weigh pure silver, copper, manganese, titanium, and nickel by mass percentage, place them in an ultrasonic cleaning device, clean them with a solution of alcohol and acetone in a volume ratio of 3:1, and mix them to obtain the proportioned raw materials, wherein the purity of the raw materials is ≥99.9%;

[0065] Step 2: Place the weighed metal raw materials into the crucible of a vacuum induction furnace and evacuate to 10 -3 Pa, after introducing Ar protective gas to 20Mpa, start the high-frequency induction device and start smelting; after the alloy ingot is completely melted, keep the alloy in a molten state for 20 minutes to make the alloy elements diffuse evenly, then turn off the induction power supply, and quickly pour the alloy melt into the mold to obtain an ingot; finally, after repeated smelting for 5 times, obtain the AgCuTiNiMn high entropy alloy brazing ingot;

[0066] Step three: Use an electric spark wire cutting machine to cut the high entropy alloy ingot into a solder sheet with a thickness of 400 μm, then polish and clean it with SiC sandpaper, and finally prepare an AgCuTiNiMn high entropy alloy solder sheet with a thickness of about 250 μm.

[0067] According to the high entropy alloy design criteria, the mixing enthalpy of AgCuTiNiMn high entropy alloy is: ΔH mix =-7.68 kJ / mol, mixing entropy: ΔS mix=13.38 kJ / mol, atomic size difference: δ=6.6%, valence electron concentration: VEC=4.6, which meet the empirical parameters for high entropy alloy design.

[0068] Example 2

[0069] The method for preparing a high entropy alloy brazing material for brazing high nitrogen steel and tungsten alloy provided in this embodiment comprises the following steps:

[0070] Step 1: Change the atomic ratio to AgCu 0.8 TiNiMn 1.2 The atomic percentage of high entropy alloy solder is converted into mass percentage, that is, Ag 32.57 Cu 15.35 Ti 14.46 Ni 17.72 Mn 19.90 , then weigh pure silver, copper, manganese, titanium, and nickel by mass percentage, place them in an ultrasonic cleaning device, clean them with a solution of alcohol and acetone in a volume ratio of 3:1, and mix them to obtain the proportioned raw materials, wherein the purity of the raw materials is ≥99.9%;

[0071] Step 2: Place the weighed metal raw materials into the crucible of a vacuum induction furnace and evacuate to 10 -3 Pa, after the Ar protective gas is introduced to 20Mpa, the high-frequency induction device is started to start smelting; after the alloy ingot is completely melted, the alloy is kept in a molten state for 25 minutes to allow the alloy elements to diffuse evenly, and then the induction power supply is turned off, and the alloy melt is quickly poured into the mold to obtain an ingot; finally, after repeated smelting for 5 times, AgCu 0.8 TiNiMn 1.2 High entropy alloy brazing ingot;

[0072] Step 3: crush the alloy ingot and put it into a quartz tube with a flat bottom, then put the quartz tube into a rapid solidification vacuum belt spinning machine and evacuate to 3×10 -3 Pa was then filled with 0.05Mpa Ar gas for protection, and after induction melting, it was sprayed onto a copper wheel with a linear speed of 25m / s to prepare an amorphous foil with a thickness of 100μm.

[0073] According to the high entropy alloy design criteria, AgCu 0.8 TiNiMn 1.2 High entropy alloy mixing enthalpy: ΔH mix =-7.73 kJ / mol, mixing entropy: ΔS mix =13.32 kJ / mol, atomic size difference: δ=6.2%, valence electron concentration: VEC=4.84, which meet the empirical parameters for high entropy alloy design.

[0074] Comparative Example 1

[0075] The solder provided in this comparative example comprises the following components by mass percentage:

[0076] Cu 80wt% and Ti 20wt%.

[0077] Comparative Example 2

[0078] The solder provided in this comparative example is B-Ni2 solder, which comprises the following components by mass percentage:

[0079] Ni 82wt%, Cr 6wt%, Si 5wt%, Fe 3.5wt% and B 3.5wt%.

[0080] Comparative Example 3

[0081] The solder provided in this comparative example includes the following components by mass percentage:

[0082] Cu 88wt% and Ge 12wt%.

[0083] Comparative Example 4

[0084] The solder provided in this comparative example includes the following components by mass percentage:

[0085] Cu 75wt% and Ge 25wt%.

[0086] Comparative Example 5

[0087] The solder provided in this comparative example comprises the following components by mass percentage:

[0088] Ti 48wt%, Zr 48wt% and Be 4wt%.

[0089] Experimental example

[0090] The performance of the brazing filler metals provided in each embodiment and comparative example was tested. The assembled P580 high nitrogen steel with a nitrogen content of 0.75%, high entropy brazing filler metal and 95W-Ni-Fe tungsten alloy were placed in a vacuum brazing furnace, and the furnace temperature was raised to 800°C at a rate of 10°C / min, then the furnace temperature was raised to 1160°C at a rate of 5°C / min, and kept at this temperature for 15 minutes, and then the furnace temperature was lowered to 100°C at a rate of 10°C / min and cooled to room temperature with the furnace.

[0091] pass Figure 1 From the DSC test curve, it can be seen that the melting point of AgCuTiNiMn high entropy alloy solder is about 1100℃.

[0092] The microstructure and EDS surface scanning results of AgCuTiNiMn high entropy alloy solder are shown in Figure 2 and Figure 3As shown, from Figure 1 and Figure 2 It can be seen that the distribution of the crystalline phase and the elements Ag, Cu, Ti, Ni, and Mn in the solder is uniform, without obvious segregation. Therefore, it can be predicted that during the heating process of brazing, the amorphous solder can be melted and diffused almost uniformly.

[0093] The high nitrogen steel / tungsten alloy brazed joint obtained in Example 1 was observed by scanning electron microscope. Figure 4 As shown, the weld is well formed without obvious defects such as pores and microcracks.

[0094] Table 1

[0095] Melting point(℃) Joint shear strength (MPa) Example 1 1094.5 168.35 Example 2 1127.4 178.85 Comparative Example 1 970 117.00 Comparative Example 2 999 148.57 Comparative Example 3 1040 106 Comparative Example 4 1040 126 Comparative Example 5 1060 127

[0096] The shear strength test of the welding samples was carried out using an electronic universal testing machine. To ensure the accuracy of the data, the shear test results under each parameter were taken from the average of three samples. The downward movement speed of the pressure head during the shear test was 1mm / min. The shear strength calculation formula is:

[0097] τ = F / S;

[0098] in:

[0099] τ is the shear strength of the brazed specimen joint (MPa);

[0100] F is the load applied during the joint shearing process (N);

[0101] S is the cross-sectional area of ​​the fractured position of the brazed joint (mm 2 ).

[0102] After testing, the shear strength of the high nitrogen steel / tungsten alloy joint brazed with the high entropy alloy brazing filler metal in Example 1 is 168.35 MPa, which is higher than that of the tungsten / steel joint brazed with the 80Cu-20Ti, B-Ni2, Cu-12Ge, Cu-25Ge, and 48Ti-48Zr-4Be brazing filler metals in the comparative example.

[0103] Although the present invention has been illustrated and described with specific embodiments, it should be appreciated that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Those skilled in the art should understand that the technical solutions described in the above embodiments may be modified, or some or all of the technical features thereof may be replaced by equivalents without departing from the spirit and scope of the present invention. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. Therefore, this means that all such replacements and modifications within the scope of the present invention are included in the appended claims.

Claims

1. A high entropy alloy brazing material for brazing high nitrogen steel and tungsten alloy, characterized in that: In terms of atomic percentage, it includes the following components: Ag 18%-32%, Cu 12%-24%, Mn 15%-25%, Ni 15%-25% and the balance Ti.

2. The high entropy alloy brazing filler metal for brazing high nitrogen steel and tungsten alloy according to claim 1, characterized in that: In terms of atomic percentage, it includes the following components: Ag 20%-30%, Cu 15%-20%, Mn 15%-25%, Ni 15%-25% and the balance Ti.

3. The high entropy alloy brazing filler metal for brazing high nitrogen steel and tungsten alloy according to claim 1 or 2, characterized in that: The high entropy alloy brazing material for brazing high nitrogen steel and tungsten alloy includes: amorphous high entropy brazing material foil or high entropy alloy brazing material sheet.

4. The high entropy alloy brazing filler metal for brazing high nitrogen steel and tungsten alloy according to claim 3, characterized in that: The thickness of the amorphous high entropy solder foil is 100-150 μm.

5. The high entropy alloy brazing filler metal for brazing high nitrogen steel and tungsten alloy according to claim 3, characterized in that: The thickness of the high entropy alloy solder sheet is 150-300 μm.

6. The method for preparing a high entropy alloy brazing filler metal for brazing high nitrogen steel and tungsten alloy according to any one of claims 1 to 5, characterized in that: The following steps are involved: After mixing all the raw materials, they are melted and formed.

7. The method for preparing a high entropy alloy brazing filler metal for brazing high nitrogen steel and tungsten alloy according to claim 6, characterized in that: The smelting temperature is 1080-1100°C.

8. The method for preparing a high entropy alloy brazing filler metal for brazing high nitrogen steel and tungsten alloy according to claim 6, characterized in that: The smelting is performed 4 to 6 times.

9. Use of the high entropy alloy brazing filler metal for brazing high nitrogen steel and tungsten alloy as claimed in any one of claims 1 to 5 or the high entropy alloy prepared by the preparation method of the high entropy alloy for brazing high nitrogen steel and tungsten alloy as claimed in any one of claims 6 to 8 in brazing high nitrogen steel and tungsten alloy.

10. The use according to claim 9, characterized in that: The brazing temperature is 1130-1170°C.

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