Preparation method of tungsten-rhenium alloy containing second-phase tungsten carbide
By introducing a carbon source into tungsten-rhenium alloys through a wet process and employing gradient calcination and hydrogen reduction techniques, the problems of embrittlement and wear resistance of tungsten-rhenium alloys under extreme working conditions were solved, achieving uniform distribution of tungsten carbides and performance improvement.
Patent Information
- Application Number
- CN202511899250.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-16
- Publication Date
- 2026-02-13
AI Technical Summary
Existing tungsten-rhenium alloys suffer from recrystallization embrittlement, insufficient thermal fatigue resistance, and poor wear resistance under extreme working conditions. Traditional tungsten carbide preparation methods are energy-intensive and difficult to control the uniformity of carbon content.
A wet process combined with complexing agents and ultrasonic dispersion is used to introduce carbon sources into tungsten-rhenium alloys through gradient calcination and hydrogen reduction, forming uniformly distributed tungsten carbides, avoiding agglomeration and precisely controlling carbon content.
This improves the high-temperature stability and mechanical properties of tungsten-rhenium alloys, enhances their resistance to thermal fatigue and wear, and improves the reliability and service life of the materials.
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Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of powder metallurgy, and particularly to a preparation method of tungsten-rhenium alloy containing second-phase tungsten carbide. BACKGROUND
[0002] Tungsten-rhenium alloy has irreplaceable properties in special high-temperature working conditions due to its excellent comprehensive performance: the melting point of tungsten is as high as 3422°C, and the melting point of rhenium is as high as 3186°C, which gives the alloy a very high melting point basis; at the same time, it also has excellent high-temperature strength, thermal stability, wear resistance, service life, thermal conductivity and thermal shock resistance, so it is widely used in aerospace engine core components, nuclear reactor structural materials, high-temperature furnace and friction stir welding, etc. in special fields with strict requirements on material performance, and is a key basic material in high-end equipment manufacturing. However, the current tungsten-rhenium alloy composition stir head in actual application still has significant technical limitations, which seriously restricts its reliability and service life in extreme working conditions: first, there is a problem of recrystallization embrittlement, which causes the grain boundary to migrate easily in high-temperature environment, and the risk of brittle fracture is greatly increased; second, the thermal fatigue resistance is insufficient, and microcracks are easily produced in repeated thermal cycle conditions, and the cracks are easily expanded and cause structural failure; third, the traditional tungsten-rhenium alloy has a shortcoming of high-temperature strength, which leads to poor wear resistance, and the surface is easily worn out in complex working conditions of friction and corrosion. The above defects have become the core bottleneck that limits the further expansion of the application scenarios of tungsten-rhenium alloy. In view of the above limitations, the industry has formed a clear improvement direction: by dispersion strengthening or introducing hard alloy phase (such as tungsten carbide), uniformly distributing carbide, oxide and other hard phases in the tungsten-rhenium alloy matrix, and by the action of hard phase hindering dislocation movement and pinning grain boundary, the high-temperature stability and mechanical properties of the material are significantly improved. However, the existing technology still has key shortcomings: traditional tungsten carbide preparation mostly uses high-temperature carbon thermal reduction method (such as reacting WO3 and carbon black at 1400-1600°C), which not only has high energy consumption, but also easily causes particle agglomeration, and it is more difficult to precisely control the uniformity of carbon content, which cannot meet the modification requirements of tungsten-rhenium alloy; in recent years, wet chemical methods such as hydrothermal synthesis and sol-gel method have attracted attention due to their flexible control of particle size and morphology, but they have not yet formed an effective modification scheme combined with the tungsten-rhenium alloy matrix.
[0003] Therefore, a method for realizing uniform carbonization by wet process based on tungsten-rhenium alloy as precursor can solve the core problems of carbon source segregation, uneven distribution of second phase, weak interface bonding, and insufficient strength and performance. SUMMARY
[0004] Therefore, the purpose of the present application is to overcome the shortcomings of the prior art and provide a preparation method of tungsten-rhenium alloy containing second-phase tungsten carbide, which can solve the problems of carbon source segregation, uneven distribution of second phase, and weak interface bonding.
[0005] To achieve the above object, the technical scheme adopted by the present application is as follows: a preparation method of tungsten-rhenium alloy containing second-phase tungsten carbide, comprising the following steps: S1, preparing tungsten-rhenium pre-alloy powder, uniformly mixing the tungsten-rhenium pre-alloy powder, an organic carbon source and a complexing agent to obtain a mixture A, then dissolving the mixture A in deionized water and heating and stirring until dry to obtain a mixture B; S2, crushing and sieving the mixture B, gradient calcining and hydrogen reduction to obtain a mixture C with uniform carbon distribution; S3, using cold isostatic pressing to shape the mixture C, and sintering to obtain tungsten-rhenium alloy containing second-phase tungsten carbide.
[0006] The present application introduces a carbon source into the tungsten-rhenium alloy by a wet process, performs gradient calcining and programmed hydrogen reduction under a specific atmosphere and temperature, forms a mixture with uniform carbon distribution in situ, and further presses and sintering to form dispersed carbon in the tungsten-rhenium alloy and reduce the oxygen content.
[0007] Preferably, in S1, the preparation method of the tungsten-rhenium pre-alloy powder is as follows: mixing ammonium paratungstate and ammonium rhenium acid, spray drying to obtain a precursor powder, and hydrogen reduction to obtain the tungsten-rhenium pre-alloy powder.
[0008] Further preferably, the mass ratio of tungsten to rhenium is (75-95):(5-25), and the hydrogen reduction temperature is 900-1100℃.
[0009] Preferably, in S1, at least one of the following (1)-(5) is included: (1) the organic carbon source is at least one of glucose, fructose, sucrose and water-soluble starch, the mass fraction of the organic carbon source is 1.5-6.0 parts, and the total mass fraction of the tungsten-rhenium pre-alloy powder and the organic carbon source is 100 parts; preferably, the mass fraction of the organic carbon source is 3-4.5 parts; (2) the complexing agent is at least one of citric acid, oxalic acid and tartaric acid, and the mass percentage of the complexing agent is 0.5-1.5wt.% based on the total mass fraction of the tungsten-rhenium pre-alloy powder and the organic carbon source; (3) the liquid-solid ratio of the deionized water to the mixture A is 3-8ml / g; (4) the heating is water bath heating, the temperature of the water bath heating is 90-95℃, and the stirring rate is 200-300rpm; (5) after heating to dryness, drying is performed to obtain the mixture B; wherein during the drying process, ultrasonic dispersion is performed for 1-3min every 20-30min.
[0010] Preferably, in the S2, the gradient calcination conditions are set as follows: in the first stage, the calcination temperature is 300-400℃, the heating rate is 8-12℃ / min, and the calcination time is 0.5-1.5h; in the second stage, the calcination temperature is 600-760℃, the heating rate is 8-12℃ / min, and the calcination time is 0.5-1.5h; both of the two-stage calcinations are carried out in an inert gas atmosphere, and the inert gas flow rate is 3-5L / min.
[0011] Preferably, in the S2, the hydrogen reduction temperature is 900-1100℃, the heating rate is 8-12℃ / min, the hydrogen reduction time is 1-2h, and the hydrogen flow rate is 3-5L / min. Preferably, in the S2, after the hydrogen reduction, the temperature is reduced to 400℃ or below, and then reduced to 25-30℃ in an inert gas atmosphere.
[0012] Preferably, in the S3, the cold isostatic pressing pressure is 150-200MPa, and the pressure holding time is 10-20min; the sintering temperature is 2200-2300℃, and the sintering time is 4-8h.
[0013] In addition, the application provides a tungsten-rhenium alloy containing a second phase tungsten carbide prepared by the preparation method of the tungsten-rhenium alloy containing a second phase tungsten carbide.
[0014] Preferably, the tungsten-rhenium alloy containing a second phase tungsten carbide has a density of >90%, a hardness of >520HV, and a wear volume of <0.1400mm 3 .
[0015] Further, the application provides an application of the tungsten-rhenium alloy containing a second phase tungsten carbide in preparing aerospace engine components, nuclear reactor structural materials, high-temperature furnaces or friction stir welding.
[0016] Compared with the prior art, the application has the following beneficial effects: (1) the wet process is combined with a complexing agent to improve the adsorption performance of the carbon source on the surface of the metal particles, and the ultrasonic dispersion is combined to realize in-situ nucleation of the carbide through solid-phase diffusion or liquid-phase reaction to prevent agglomeration and effectively decompose impurities in subsequent calcination, thereby improving the uniformity of the tungsten carbide phase distribution; (2) the specific atmosphere protection / reaction is combined with the gradient carbonization and hydrogen reduction process to accurately control the carbonization, reduction process and carbon content, thereby avoiding excessive sintering or composition segregation and guaranteeing the dispersion distribution of the in-situ generated tungsten carbide. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 The morphology of the mixture C prepared in Example 5 of the application is shown in the figure, wherein Fig. (a) is 2000x, Fig. (b) is 5000x, Fig. (c) is 10000x, and Fig. (d) is 20000x. Figure 2 Elemental spectrum of mixture C prepared for the embodiment 5 of the present application; wherein, figure (a) is the energy spectrum scanning area, figure (b) is the overall distribution of scanning area W, Re, O, figure (c) is the distribution of W, figure (d) is the distribution of Re; Figure 3 XRD pattern of the tungsten-rhenium alloy containing second phase tungsten carbide of the embodiment 5 of the present application; Figure 4 Metallograph of the tungsten-rhenium alloy containing second phase tungsten carbide of the embodiment 5 of the present application; Figure 5 Metallograph of the tungsten-rhenium alloy prepared for the comparative example 1 of the present application; Figure 6 Metallograph of the tungsten-rhenium alloy prepared for the comparative example 5 of the present application. DETAILED DESCRIPTION
[0018] For the purpose of better illustrating the object, technical scheme and advantages of the present application, the present application will be further explained in combination with the drawings and specific embodiments. The purpose is to understand the content of the present application in detail, rather than to limit the present application. All other embodiments obtained by the ordinary skilled in the art without making creative efforts belong to the protection scope of the present application. The experimental reagents and instruments designed in the embodiment and comparative examples of the present application are common reagents and instruments, which can be obtained from commercial channels, unless otherwise specified. In the embodiment and comparative examples, the experimental methods used are conventional methods, unless otherwise specified; and the raw materials used in parallel experiments are the same batch of raw materials, unless otherwise specified.
[0019] The raw materials used in the present application will be further explained, but are not limited to the following raw materials: Ammonium metatungstate: purity: 99.99%, purchased from Jiangxi Tungsten Industry; Ammonium rhenate: purity: 99.99%, purchased from Jiangxi Copper Industry Guixi Smelter; The organic carbon source, complexing agent, etc. used in the embodiment and comparative examples are conventional commercially available products, and no special explanation is given.
[0020] Embodiment 1 S1, prepare tungsten-rhenium pre-alloy powder, mix tungsten-rhenium pre-alloy powder, organic carbon source-fructose, complexing agent-oxalic acid uniformly to obtain mixture A, then dissolve with deionized water, heat and stir in water bath, dry by heating in an oven after heating to dryness to obtain mixture B; The preparation method of tungsten-rhenium pre-alloy powder is as follows: according to the mass ratio of tungsten 75.0wt.% and rhenium 25.0wt.%, a precursor powder is prepared by spray drying, and a tungsten-rhenium pre-alloy powder is obtained after hydrogen reduction at 1000℃; The tungsten-rhenium pre-alloyed powder and the organic carbon source are weighed according to the mass content of 98.5wt.% and 1.5wt.%; the mass percentage content of the complexing agent is 1.0wt.% based on the total mass fraction of the tungsten-rhenium pre-alloyed powder and the organic carbon source; and the liquid-solid ratio of the deionized water to the mixture A is 3ml / g; The temperature of the water bath heating is 95℃, and the stirring rate is 250rpm; During the heating process, the ultrasonic dispersion is performed every 30min for 1min; S2, the mixture B is crushed and sieved, and gradient calcination is performed under a nitrogen atmosphere using a reduction furnace, and a mixture C with uniform carbon distribution is obtained after 1000℃ hydrogen reduction; The gradient calcination conditions are set as follows: in the first stage, the calcination temperature is 300℃, the heating rate is 10℃ / min, and the calcination time is 1h; in the second stage, the calcination temperature is 600℃, the heating rate is 10℃ / min, and the calcination time is 1h; The heating rate of the hydrogen reduction is 10℃ / min, the hydrogen reduction time is 1h, and the hydrogen reduction temperature is 1000℃; After the hydrogen reduction is completed, the temperature is lowered to 400℃, and then lowered to 30℃ under a nitrogen atmosphere; The flow rate of the nitrogen and hydrogen is 4L / min; S3, the mixture C is pressed into shape using cold isostatic pressing (the pressure is 180MPa, and the pressure maintaining time is 15min), and sintered at 2300℃ for 4h using a hydrogen sintering furnace to obtain a tungsten-rhenium alloy containing second-phase tungsten carbide.
[0021] Example 2 Compared with Example 1, only the mass content of the tungsten-rhenium pre-alloyed powder and the organic carbon source-fructose in S1 is different, and the tungsten-rhenium pre-alloyed powder and the organic carbon source are weighed according to the mass content of 97wt.% and 3wt.%.
[0022] Example 3 Compared with Example 1, only the mass content of the tungsten-rhenium pre-alloyed powder and the organic carbon source-fructose in S1 is different, and the tungsten-rhenium pre-alloyed powder and the organic carbon source are weighed according to the mass content of 95.5wt.% and 4.5wt.%.
[0023] Example 4 Compared with Example 1, only the mass content of the tungsten-rhenium pre-alloyed powder and the organic carbon source-fructose in S1 is different, and the tungsten-rhenium pre-alloyed powder and the organic carbon source are weighed according to the mass content of 94wt.% and 6wt.%.
[0024] Example 5 S1, preparing tungsten-rhenium pre-alloy powder, mixing tungsten-rhenium pre-alloy powder, organic carbon source-glucose, complexing agent-citric acid uniformly to obtain mixture A, then dissolving with deionized water, heating and stirring in water bath, heating to dryness, drying in oven to obtain mixture B; The preparation method of the tungsten-rhenium pre-alloy powder is as follows: according to the mass ratio of 75.0wt.% of tungsten and 25.0wt.% of rhenium, a precursor powder is prepared by spray drying, and the tungsten-rhenium pre-alloy powder is obtained after hydrogen reduction at 1100℃; The tungsten-rhenium pre-alloy powder and the organic carbon source are weighed according to the mass content of 95.5wt.% and 4.5wt.%; the mass percentage of the complexing agent is 1.0wt.% based on the total mass of the tungsten-rhenium pre-alloy powder and the organic carbon source; and the liquid-solid ratio of the deionized water to mixture A is 5ml / g; The temperature of the water bath heating is 90℃, and the stirring rate is 300rpm; During the heating process, ultrasonic dispersion is performed every 25min for 2min; S2, crushing and sieving mixture B, gradient calcination in a reduction furnace under nitrogen atmosphere, hydrogen reduction at 1100℃ to obtain mixture C with uniform carbon distribution; The gradient calcination conditions are set as follows: first stage, calcination temperature 350℃, calcination heating rate 10℃ / min, calcination time 1.5h; second stage, calcination temperature 650℃, calcination heating rate 10℃ / min, calcination time 1.5h; The hydrogen reduction heating rate is 10℃ / min, the hydrogen reduction time is 1.5h, and the hydrogen reduction temperature is 1100℃; After the hydrogen reduction is completed, the temperature is lowered to 350℃, and then lowered to 25℃ under nitrogen atmosphere; The nitrogen and hydrogen flow rate is 5L / min; S3, mixture C is pressed into shape using cold isostatic pressing (pressure 180MPa, pressure holding time 15min), and sintered at 2300℃ for 4h using a hydrogen sintering furnace to obtain tungsten-rhenium alloy containing second phase tungsten carbide.
[0025] Comparative Example 1 Compared with Example 1, only the gradient calcination in S2 is not performed, and other steps are completely the same; Specifically, S2 is as follows: mixture B is crushed and sieved, and reduced at a heating rate of 10℃ / min to 1000℃ for 2h using a reduction furnace; the hydrogen flow rate is 4L / min; after the hydrogen reduction is completed, the temperature is lowered to 400℃, and then lowered to 30℃ under nitrogen atmosphere.
[0026] Comparative Example 2 Compared with Example 1, only the gradient calcination temperature in S2 is different, and other steps are completely the same; Specifically, S2 is as follows: the mixture B is broken and sieved, gradient calcination is performed in a reducing furnace under a nitrogen atmosphere, and a mixture C with uniform carbon distribution is obtained after hydrogen reduction at 1000℃; The gradient calcination conditions are set as follows: first stage, calcination temperature 200℃, calcination heating rate 10℃ / min, and calcination time 1h; second stage, calcination temperature 400℃, calcination heating rate 10℃ / min, and calcination time 1h; The hydrogen reduction heating rate is 10℃ / min, the hydrogen reduction time is 1h, and the hydrogen reduction temperature is 1000℃; After the hydrogen reduction, the temperature is decreased to 400℃, and then decreased to 30℃ under a nitrogen atmosphere; The nitrogen and hydrogen flow rates are 4L / min; Comparative Example 3 Compared with Example 1, only one stage of calcination is performed in S2, and the other steps are completely the same; Specifically, S2 is as follows: the mixture B is broken and sieved, gradient calcination is performed in a reducing furnace under a nitrogen atmosphere, and a mixture C with uniform carbon distribution is obtained after hydrogen reduction at 1000℃; The calcination conditions are set as follows: calcination temperature 600℃, calcination heating rate 10℃ / min, and calcination time 2h; The hydrogen reduction heating rate is 10℃ / min, the hydrogen reduction time is 1h, and the hydrogen reduction temperature is 1000℃; After the hydrogen reduction, the temperature is decreased to 400℃, and then decreased to 30℃ under a nitrogen atmosphere; The nitrogen and hydrogen flow rates are 4L / min; Comparative Example 4 Compared with Example 1, only the mass content of the tungsten-rhenium pre-alloyed powder and the organic carbon source in S1 is different, and the tungsten-rhenium pre-alloyed powder and the organic carbon source are weighed according to a mass content of 92wt.% and 8wt.%.
[0027] Comparative Example 5 Compared with Example 1, only the mass content of the tungsten-rhenium pre-alloyed powder and the organic carbon source in S1 is different, and there is no organic carbon source, and the tungsten-rhenium pre-alloyed powder is 100wt.%.
[0028] Performance Test (1) Composition analysis of the mixture C prepared after steps S1 and S2, and composition analysis of the tungsten-rhenium alloy containing the second-phase tungsten carbide prepared after S1, S2, and S3 in the examples and comparative examples; The component test standards are as follows: the sintered compact sample is cut by wire cutting, the outer oxide layer is polished off by sandpaper, cleaned by alcohol and dried, the Re content is tested by ICP-OES, the C content is tested by carbon-sulfur analyzer, the O content is tested by oxygen-nitrogen-hydrogen analyzer, and the W content is the balance except Re, C and O.
[0029] (2) The density test standards are as follows: based on Archimedes' law of buoyancy, the volume density of the sample is calculated by measuring the weight of the sample in air and immersed in water, and then compared with the theoretical density to obtain the density (density=(volume density / theoretical density) x 100%).
[0030] (3) The hardness test standards are as follows: test force: 1.0 kgf, pressure holding time: 10 s, each sample is measured 5 times, the maximum and minimum values are removed, and then the average value is taken as the Vickers hardness value of the sample.
[0031] (4) The wear volume test standards are as follows: the friction test of the present application uses a reciprocating friction tester, the friction conditions are: pressure 50 N, 5 mm diameter Si3N4 counter ball, 500 reciprocating times per minute, friction distance 5 mm, time 30 min, room temperature.
[0032] The surface profilometer is used to scan perpendicular to the wear direction to obtain a two-dimensional profile curve across the wear mark, and the instrument software calculates the cross-sectional area A (unit mm 2 ) of the closed area, the wear track circumference L (for reciprocating experiment, L can be taken as the length of the wear area, unit mm), V=A x L.
[0033] The test results are shown in Tables 1 and 2.
[0034] Table 1 Table 2 From the above tables and Figures 1-2 It can be seen that the carbon content in the mixture C prepared by gradient calcination and hydrogen reduction of Example 5 is 1.05 wt.%, the small particles of the alloy powder are agglomerated into larger particles, the tungsten and rhenium are uniformly distributed in all large and small particles, the carbon after carbonization of glucose is retained in the mixture C, and the generated carbon will react with excess oxygen during hydrogen reduction and sintering, so that the sintered tungsten-rhenium alloy maintains very low oxygen content, and the carbon content in the tungsten-rhenium alloy containing secondary tungsten carbide after sintering of Example 5 is 0.33 wt.%.
[0035] In combination with Figure 3The tungsten-rhenium alloy powder of the embodiment 5 of the present application has more dispersed tungsten carbide formed in situ in the sintered tungsten-rhenium alloy due to the presence of appropriate amount of carbon, so that the hardness of the product reaches 609HV, which is 36% higher than that of the conventional sintered tungsten-rhenium alloy without carbon, and the wear volume is reduced by 61%, effectively improving the strength and wear resistance of the tungsten-rhenium alloy containing the second phase tungsten carbide.
[0036] From Figure 4 the metallographic diagram, it can be seen that the second phase tungsten carbide generated in situ in the embodiment 5 of the present application has clear grain boundary and uniform distribution, and the grain size of the second phase tungsten carbide is between 10-40μm.
[0037] The comparative example 1 does not use the gradient decomposition and carbonization under specific atmosphere and temperature, and directly performs hydrogen reduction, so that all the carbon is lost, as shown in Figure 5 , so that there is no tungsten carbide phase in the sintered tungsten-rhenium alloy, and the hardness and friction performance thereof are worse than those of the tungsten-rhenium alloy with tungsten carbide phase. The temperature of the gradient calcination in the comparative example 2 is different, and since the decomposition and carbonization are not complete during calcination, the carbon is consumed by the residual oxygen at the high temperature stage, so that the carbon cannot be effectively preserved, and the effect of improving the alloy performance cannot be achieved. The comparative example 3 only performs one-step calcination, and the calcination temperature is too high, so that the carbon is directly consumed without decomposition and carbonization, and the appropriate amount of tungsten carbide cannot be generated to improve the alloy performance. The comparative example 4 has excessive organic carbon source, and excessive carbon is reserved in the pre-alloy powder, so that excessive tungsten carbide is generated in the alloy. Although the second phase can improve the hardness to a certain extent, the excessive second phase tungsten carbide will be peeled off during friction, and the friction performance is reduced. The comparative example 5 does not contain organic carbon source, as shown in Figure 6 , since there is no second phase tungsten carbide for strengthening, the performance thereof is obviously the worst.
[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not used to limit the protection scope of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present application.
Claims
1. A method for preparing a tungsten-rhenium alloy containing a second-phase tungsten carbide, characterized in that, Includes the following steps: S1. Prepare tungsten-rhenium pre-alloyed powder. Mix the tungsten-rhenium pre-alloyed powder, organic carbon source, and complexing agent evenly to obtain mixture A. Dissolve the mixture in deionized water and heat and stir until it evaporates to dryness to obtain mixture B. S2. After crushing and sieving mixture B, perform gradient calcination and hydrogen reduction to obtain mixture C with uniform carbon distribution. S3. The mixture C is pressed into shape using cold isostatic pressing and then sintered to obtain a tungsten-rhenium alloy containing a second phase of tungsten carbide.
2. The method for preparing tungsten-rhenium alloy containing a second-phase tungsten carbide as described in claim 1, characterized in that, In S1, the preparation method of tungsten-rhenium pre-alloyed powder is as follows: ammonium metatungstate and ammonium rhenium are mixed and spray-dried to obtain precursor powder, which is then reduced with hydrogen to obtain tungsten-rhenium pre-alloyed powder.
3. The method for preparing tungsten-rhenium alloy containing a second-phase tungsten carbide as described in claim 1, characterized in that, The S1 includes at least one of the following (1)-(5): (1) The organic carbon source is at least one of glucose, fructose, sucrose, and water-soluble starch, and the organic carbon source has a mass fraction of 1.5-6.0 parts, and the total mass fraction of the tungsten-rhenium pre-alloy powder and the organic carbon source is 100 parts; preferably, the organic carbon source has a mass fraction of 3-4.5 parts. (2) The complexing agent is at least one of citric acid, oxalic acid, and tartaric acid, and the mass percentage of the complexing agent is 0.5-1.5 wt.% based on the total mass of the tungsten-rhenium pre-alloy powder and the organic carbon source. (3) The liquid-to-solid ratio of the deionized water to mixture A is 3-8 ml / g; (4) The heating is water bath heating, the temperature of the water bath heating is 90-95℃, and the stirring speed is 200-300rpm; (5) The mixture B is obtained by heating to dryness and then drying; wherein during the evaporation process, ultrasonic dispersion is performed for 1-3 minutes every 20-30 minutes.
4. The method for preparing tungsten-rhenium alloy containing a second-phase tungsten carbide as described in claim 1, characterized in that, In step S2, the gradient calcination conditions are set as follows: First stage, calcination temperature 300-400℃, calcination heating rate 8-12℃ / min, calcination time 0.5-1.5h; Second stage, calcination temperature 600-760℃, calcination heating rate 8-12℃ / min, calcination time 0.5-1.5h; Both stages of calcination are carried out under an inert gas atmosphere, and the inert gas flow rate is 3-5L / min. And / or, the hydrogen reduction temperature is 900-1100℃, the heating rate is 8-12℃ / min, the hydrogen reduction time is 1-2h, and the hydrogen flow rate is 3-5L / min; And / or, after the hydrogen reduction is completed, the temperature is lowered to 400°C or below, and then lowered to 25-30°C in an inert gas atmosphere.
5. The method for preparing tungsten-rhenium alloy containing a second-phase tungsten carbide as described in claim 1, characterized in that, In step S3, the pressure of cold isostatic pressing is 150-200 MPa, and the holding time of cold isostatic pressing is 10-20 min; the sintering temperature is 2200-2300℃, and the time is 4-8 h.
6. A tungsten-rhenium alloy containing a second-phase tungsten carbide prepared by a method according to any one of claims 1-5.
7. The tungsten-rhenium alloy containing a second-phase tungsten carbide as described in claim 6, characterized in that, The tungsten-rhenium alloy containing the second-phase tungsten carbide has a density >90%, a hardness >520HV, and a wear volume <0.1400mm. 3 .
8. The application of the tungsten-rhenium alloy containing second-phase tungsten carbide as described in claim 6 in the preparation of aerospace engine components, nuclear reactor structural materials, high-temperature furnaces, or friction stir welding.