A high-entropy (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C ceramic material and a method of making the same

Abstract

The application relates to the field of ultrahigh-temperature ceramic materials, in particular to a high-entropy (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C ceramic material containing a rare earth element Y and a preparation method thereof. The material is prepared by adopting induction heating pressureless sintering, and the specific operation steps are as follows: 1) HfC, TiC, WC, Mo2C, YH2 and C powders are proportionally put into a nylon tank, anhydrous ethanol is used as a medium, and a powder slurry is obtained by adopting a wet ball milling method; 2) the powder slurry is evaporated, dried and sieved to obtain HfC-TiC-WC-Mo2C-YH2-C mixed powder, and the mixed powder is cold-pressed into a shape in a stainless steel mold; 3) the shaped body is put into a graphite crucible and is placed into an ultrahigh-temperature induction heating furnace together with the crucible, and (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C ultrahigh-temperature ceramic is obtained by pressureless sintering under vacuum. The (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C ultrahigh-temperature material prepared by the method has the advantages of high purity, simple preparation process flow, short preparation period and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ultrahigh-temperature ceramic materials, in particular to a high-entropy (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C ceramic material containing rare earth element Y and a preparation method thereof. BACKGROUND

[0002] Ultrahigh-temperature ceramics refer to a class of non-oxide ceramic materials with a melting point exceeding 3000 DEG C, mainly including borides, carbides and nitrides of early transition metals, among which carbides and nitrides have a series of unique properties, including high density, chemical thermal stability, corrosion resistance and extremely high melting point, making them ideal candidate materials for ultrahigh-temperature thermal structures and thermal protection systems. A single-phase compound composed of equimolar or nearly equimolar ratios of not less than four elements of cations or anions is called high-entropy ceramic. These high-entropy ceramics have better mechanical properties, ionic conductivity, corrosion resistance and other properties than single-component ceramics. The emergence of ultrahigh-temperature high-entropy ceramics is expected to solve the problem of poor high-temperature oxidation resistance of single-phase ceramics, providing a new idea for the research of ultrahigh-temperature ceramics. It is one of the most promising ultrahigh-temperature thermal protection materials and has attracted widespread attention. In particular, there is no public report on the solid solution of rare earth element cations in high-entropy carbides and related properties at home and abroad, so the preparation of high-entropy ceramics containing rare earth element cations and the gradual development of high-temperature and ultrahigh-temperature performance research also have good application prospects. SUMMARY

[0003] The present application aims to provide a high-entropy (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C ceramic material containing rare earth element Y and a preparation method thereof. The method can quickly heat to the sintering temperature, has the characteristics of simple operation process and short sintering period, and can meet the demand of large-scale batch production.

[0004] The technical scheme of the present application is as follows:

[0005] A high-entropy (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C ceramic material containing rare earth element Y, wherein the chemical composition of the high-entropy ceramic material is (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C.

[0006] The high-entropy (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C ceramic material, preferably the stoichiometric ratio of Hf, Ti, W, Mo, Y, C is 1:1:1:1:1:5.

[0007] The high-entropy (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C ceramic material, the high-entropy (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C ceramic material realizes the uniform solid solution of metal elements and rare earth element Y, and the particle size is uniform, being 2-3 μm.

[0008] The high-entropy (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C ceramic material, the method comprising the following specific operation steps:

[0009] 1) The required HfC, TiC, WC, Mo2C, YH2 and C raw material powders are weighed according to the designed proportion, and are sequentially poured into a nylon tank containing Si3N4 grinding balls in a "more-less-more-less-more-less" manner, and anhydrous ethanol is added as a medium, wherein the mass ratio of Si3N4 grinding balls and raw material powders is 2.8-3.5:1, and the mass ratio of anhydrous ethanol and raw material powders is 3-6:10;

[0010] 2) The nylon tank containing the raw material powders and the anhydrous ethanol medium is fixed in a planetary ball mill for wet ball milling mixing, the ball milling time is 8-12 h, and the ball milling rotation speed is 240-300 rpm;

[0011] 3) The powder slurry obtained after wet ball milling is evaporated and dried, and is sieved to obtain a mixed powder, wherein the mesh number of the sieve is 80-120 mesh;

[0012] 4) The obtained mixed powder is loaded into a stainless steel mold for cold pressing forming, the applied pressure is in the range of 10-20 kN, the pressure holding time is 3-10 min, and the diameter of the stainless steel mold is 8-20 mm;

[0013] 5) the mixed powder after cold compaction is placed in a graphite crucible and placed in an ultra-high temperature induction heating pressureless sintering furnace, and pressureless sintering is carried out in a vacuum, the heating rate is 80-100 DEG C / min, the sintering temperature is 2400-2450 DEG C, and the sintering time is 0.5-1 h;

[0014] 6) after the end of the heat preservation, the temperature is decreased to 800-1000 DEG C at a rate of 60-100 DEG C / min, and then the furnace is cooled to room temperature, thereby obtaining a high-entropy (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C ceramic material containing rare earth element Y.

[0015] The preparation method of the high-entropy (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C ceramic material containing rare earth element Y, in step 1), the average particle size of the HfC powder is 0.8 mu m, the powder purity is greater than or equal to 99wt%; the average particle size of the TiC powder is 1-3 mu m, the powder purity is greater than or equal to 99.5wt%; the average particle size of the WC powder is 1-2 mu m, the powder purity is greater than or equal to 99.5wt%; the average particle size of the Mo2C powder is 1-2 mu m, the powder purity is greater than or equal to 99.5wt%; the average particle size of the YH2 powder is 1-2 mu m, the powder purity is greater than or equal to 99wt%; and the average particle size of the C powder is 1-2 mu m, the powder purity is greater than or equal to 99.9wt%.

[0016] The design idea of the application is:

[0017] The high-entropy (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C ceramic material containing rare earth element Y is prepared by induction heating pressureless sintering, because a large number of components are introduced into the high-entropy carbide ceramic, especially the rare earth element is first dissolved in the cation position of the carbide, which causes the existence of atomic size difference in the unit cell, generates a large number of lattice distortions, increases the resistance of dislocation movement, makes the sliding under external force very difficult, greatly improves the strength and hardness of the ceramic, and the change of thermal resistance caused by the increase of defects in the ceramic further improves the thermal conductivity of the ceramic, and the lattice distortion limits the movement of phonons, and for the high-entropy carbide ceramic, the contribution rate of phonons in thermal conductivity increases, thereby improving the thermal conductivity of the high-entropy carbide ceramic. 0.2 Y 0.2 W 0.2 Mo 0.2Ti 0.2 )C solid solution ceramic has super-high melting point, good thermal stability and great application prospect in super-high temperature.

[0018] The advantages and beneficial effects of the present application are:

[0019] 1. The new high-entropy (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C ceramic material contains rare earth element Y, and is prepared by pressureless sintering using super-high temperature induction heating equipment, so that the sample has high purity and no impurity phase.

[0020] 2. The new high-entropy (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C ceramic material contains rare earth element Y, and the prepared sample has high purity and no impurity phase.

[0021] 3. The new high-entropy (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C ceramic material has good thermal stability. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 Figure 1 is an X-ray diffraction spectrum of the (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C ceramic material prepared in Example 1.

[0023] Figure 2 Figure 2 is a surface morphology photograph (a) and an energy spectrum (b) of the high-entropy (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C ceramic material prepared in the present application (Example 2).

[0024] Figure 3 is a surface morphology photograph (a) and an energy spectrum (b) of the high-entropy (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti0.2 Surface morphology photograph (a) and energy spectrum (b) of the (Hf

[0025] Figure 4 Surface morphology photograph (a) and energy spectrum (b) of the (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 EDS element surface distribution analysis diagram of the (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 Surface morphology photograph (a) and energy spectrum (b) of the (Hf

[0026] Figure 5 Surface morphology photograph (a) and energy spectrum (b) of the (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 Thermogravimetric (TG) and differential scanning calorimetry (DSC) curves of the (Hf DETAILED DESCRIPTION

[0027] In the specific implementation process, the present application adopts a powder metallurgy method to prepare a high-entropy (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 C ceramic material containing a rare earth element Y by pressureless sintering, and the specific operation steps of the method are as follows:

[0028] 1) The required HfC, TiC, WC, Mo2C, YH2 and C raw material powders are weighed according to the designed proportion, and are sequentially poured into a nylon tank containing Si3N4 grinding balls, so that the samples are fully contacted and mixed uniformly. Anhydrous ethanol is added as a ball milling medium, and the mass ratio of the Si3N4 grinding balls and the raw material powders is 2.8-3.5:1, and the mass ratio of the anhydrous ethanol and the raw material powders is 3-6:10;

[0029] The average particle size of the HfC powder is 0.8 microns, the powder purity is greater than or equal to 99 wt%; the average particle size of the TiC powder is 1-3 microns, the powder purity is greater than or equal to 99.5 wt%; the average particle size of the WC powder is 1-2 microns, the powder purity is greater than or equal to 99.5 wt%; the average particle size of the Mo2C powder is 1-2 microns, the powder purity is greater than or equal to 99.5 wt%; the average particle size of the YH2 powder is 1-2 microns, the powder purity is greater than or equal to 99 wt%; and the average particle size of the C powder is 1-2 microns, the powder purity is greater than or equal to 99.9 wt%.

[0030] 2) The nylon tank containing the raw material powder and the anhydrous ethanol medium is fixed in the planetary ball mill for ball milling mixing, so as to reduce the particle size of the powder, expose the fresh active surface of the powder, and facilitate subsequent pressureless sintering, the ball milling time is 8-12 hours, and the ball milling speed is 240-300 rpm;

[0031] 3) The powder slurry obtained after mixing and crushing is evaporated and dried, and sieved to obtain the mixed powder, the mesh number of the sieve is 80-120 mesh;

[0032] 4) The obtained mixed powder is loaded into a stainless steel mold for cold pressing forming, the applied pressure is in the range of 10-20 kN, the pressure holding time is 3-10 minutes, and the diameter of the stainless steel mold is 8-20 mm;

[0033] 5) The mixed powder after cold pressing forming is placed in a graphite crucible and placed in an ultra-high temperature induction heating pressureless sintering furnace for pressureless sintering in a vacuum, the heating rate is 80-100 ℃ / min, the sintering temperature is 2400-2450 ℃, and the sintering time is 0.5-1 hour;

[0034] 6) After the holding is completed, the temperature is decreased to 800-1000 ℃ at a rate of 60-100 ℃ / min, and then the furnace is cooled to room temperature, to obtain a high-entropy (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C ceramic material containing rare earth element Y.

[0035] The ceramic material comprises a phase of (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C. The prepared sample realizes uniform solid solution of metal elements and rare earth elements at the cation position of the carbide, the particle size is uniform, is 2-3 microns, and the Hf, Ti, W, Mo, Y and C elements contained therein are uniformly distributed. Further, it is verified by the examples that the prepared ceramic material is uniform in composition.

[0036] The application will be further described in detail below by examples and drawings. However, the examples should not be used to explain the scope of the protection of the application, and all changes within the basic idea of the technical solution of the application or essentially equivalent to the technical solution of the application are within the protection scope of the application.

[0037] Example 1

[0038] First, 19.05 g of HfC powder with a particle size of 0.8 μm, 5.99 g of TiC powder with a particle size of 1 μm, 10.20 g of Mo2C powder with a particle size of 1 μm, 9.09 g of YH2 powder with a particle size of 1 μm, 19.58 g of WC powder with a particle size of 1 μm, and 1.80 g of C powder with a particle size of 1 μm (the prepared (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C material Hf, Ti, W, Mo, Y, C stoichiometric ratio of 1:1:1:1:1:5) were put into a nylon ball mill jar and ball milled for 12 h. After evaporation drying, the mixture ceramic powder was obtained by passing through an 80 mesh sieve. Then, the mixture ceramic powder was loaded into a stainless steel mold with a diameter of 20 mm and cold pressed at 15 kN for 5 min. Then, the cold-pressed mixture powder was placed in a graphite crucible and placed in an induction heating furnace for pressureless sintering in vacuum, heated to 2400℃ at a heating rate of 80℃ / min, and held for 0.5 h. After the holding period, the temperature was lowered to 1000℃ at a cooling rate of 60℃ / min, and air-cooled to room temperature to obtain a (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C ultra-high temperature ceramic material.

[0039] As Figure 1 shown, the X-ray diffraction spectrum of the high-entropy (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C ceramic material prepared in this example can be seen from the diffraction spectrum that after high-temperature sintering, the initial materials HfC, TiC, WC, Mo2C, YH2 and C are combined into (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C, and the HfC, TiC, WC, MoC, YC characteristic peaks are fused to achieve solid solution, obtaining a single-phase high-entropy (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2C phase, sample is pure without impurity peaks.

[0040] Example 2

[0041] First, HfC powder 9.53 g with particle size of 0.8 μm, TiC powder 2.99 g with particle size of 1 μm, Mo2C powder 5.10 g with particle size of 1 μm, YH2 powder 4.55 g with particle size of 1 μm, WC powder 9.79 g with particle size of 1 μm, and C powder 0.90 g with particle size of 1 μm were put into a nylon ball mill jar and ball milled for 12 h. After evaporation drying, the mixture ceramic powder was obtained by sieving through 80 mesh. Then, the mixture ceramic powder was cold pressed into a stainless steel mold with a diameter of 20 mm at 15 kN for 5 min. Then, the cold-pressed mixture powder was placed in a graphite crucible and placed in an induction heating furnace for pressureless sintering in vacuum, heated to 2400 °C at a heating rate of 90 °C / min, and held for 0.5 h. After the holding period, the temperature was decreased to 1000 °C at a cooling rate of 60 °C / min, and air-cooled to room temperature to obtain a (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C material with a stoichiometric ratio of 1:1:1:1:1:5. 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C ultra-high temperature ceramic material.

[0042] As Figure 2 shown in Table 1, the surface morphology photo, energy spectrum and the content of each element of the high-entropy (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C ceramic material prepared in this example can be seen that the content of each element of the obtained material meets the expectation and there is no element escaping and impurity element, and the Figure 2 content of each element of the (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C ultra-high temperature ceramic material is uniform and uniformly distributed.

[0043] Table 1. Content of each element of high-entropy (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C ceramic material

[0044] Element C Ti Y Mo Hf W Weight % 9.81 6.77 13.40 12.81 30.05 27.16 Atomic % 52.41 9.07 9.67 8.57 10.80 9.48

[0045] Example 3

[0046] First, HfC powder 6.35 g with a particle size of 0.8 μm, TiC powder 2.00 g with a particle size of 1 μm, Mo2C powder 3.40 g with a particle size of 1 μm, YH2 powder 3.03 g with a particle size of 1 μm, WC powder 6.53 g with a particle size of 1 μm, and C powder 0.60 g with a particle size of 1 μm (the prepared (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C material Hf, Ti, W, Mo, Y, C stoichiometric ratio of 1:1:1:1:1:5) were put into a nylon ball mill jar and ball milled for 12 h. After evaporation drying, the mixture ceramic powder was obtained by passing through an 80 mesh sieve. Next, the mixture ceramic powder was loaded into a stainless steel mold with a diameter of 20 mm and cold pressed at 15 kN for 5 min. Then, the cold-pressed mixture powder was placed in a graphite crucible and placed in an induction heating furnace for pressureless sintering in vacuum, heated to 2450 °C at a heating rate of 100 °C / min, and held for 0.5 h. After the holding period, the temperature was decreased to 1000 °C at a cooling rate of 60 °C / min, and air cooled to room temperature to obtain a (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C ultra-high temperature ceramic material.

[0047] As shown in FIG. 3- Figure 4 , Table 2, the high-entropy (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C ceramic material powder element face distribution analysis diagram prepared in this embodiment. As can be seen from the figure, the Hf element, Ti element, W element, Mo element, Y element, C element is uniformly distributed in the microstructure, and there is no other impurity phase in the sintered body.

[0048] Table 2 High-entropy (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C ceramic material powder element content

[0049] Element C Ti Y Mo Hf W Weight % 7.24 6.90 15.89 13.59 26.65 29.72 Atomic % 43.79 10.44 12.96 10.27 10.83 11.72

[0050] Example 4

[0051] First, 28.58 g of HfC powder with a particle size of 0.8 μm, 8.99 g of TiC powder with a particle size of 1 μm, 15.30 g of Mo2C powder with a particle size of 1 μm, 13.64 g of YH2 powder with a particle size of 1 μm, 29.37 g of WC powder with a particle size of 1 μm, and 2.70 g of C powder with a particle size of 1 μm were used to prepare (HfC powder). 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 The stoichiometric ratio of Hf, Ti, W, Mo, Y, and C in the material was 1:1:1:1:1:5. The mixture was ball-milled in a nylon ball mill jar for 12 hours. After evaporation and drying, it was passed through an 80-mesh sieve to obtain a mixed ceramic powder. Next, it was placed in a 20mm diameter stainless steel mold and cold-pressed at 15kN for 5 minutes. Then, the cold-pressed mixed powder was placed in a graphite crucible and sintered in a vacuum-heated furnace at a heating rate of 80℃ / min to 2450℃, held for 0.5 hours. After holding, it was cooled to 1000℃ at a cooling rate of 60℃ / min and air-cooled to room temperature to obtain (Hf... 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 C Ultra-high temperature ceramic materials.

[0052] like Figure 5 As shown, the high entropy (Hf) prepared in this embodiment 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 The TG and DSC curves of 19.66 mg of ultra-high temperature ceramic bulk material were obtained by heating it from 30 °C to 1600 °C at a rate of 10 °C / min under an argon atmosphere. Figure 5 The TG curve shows that the sample mass change is very small during the heating process, within 1.4 mg (7.12%). Furthermore, the DSC curve shows that the extrapolated onset temperature of the endothermic peak between 1250℃ and 1500℃ is 1280℃, and the peak temperature is 1471℃, both very high, indicating a high phase transition temperature. Combining the DSC and TG curves, the prepared material exhibits high thermal stability.

[0053] The results of the examples show that the high entropy (Hf) prepared by the present invention... 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2The C super-high-temperature ceramic material is not only uniform in particle size, but also pure in material prepared, free from impurity phase and high in thermal stability. In addition, the C super-high-temperature ceramic material has the advantages of simple preparation process flow and short preparation period.

Claims

1. A method for producing a high-entropy (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C ceramic material containing a rare earth element Y, characterized by, The specific operation steps of the method are as follows: 1) The required HfC, TiC, WC, Mo2C, YH2 and C raw material powders are weighed according to the design ratio, and are poured into a nylon tank containing Si3N4 grinding balls in the order of "more-less-more-less-more-less" with anhydrous ethanol as a medium, wherein the mass ratio of Si3N4 grinding balls to raw material powders is 2.8-3.5:1, and the mass ratio of anhydrous ethanol to raw material powders is 3-6:10; 2) The nylon tank containing the raw material powders and the anhydrous ethanol medium is fixed in a planetary ball mill for wet ball milling mixing, the ball milling time is 8-12 h, and the ball milling speed is 240-300 rpm; 3) The powder slurry obtained after wet ball milling is evaporated and dried, and sieved to obtain a mixed powder, wherein the mesh number of the sieve is 80-120; 4) The obtained mixed powder is loaded into a stainless steel mold for cold pressing forming, the applied pressure is in the range of 10-20 kN, the pressure holding time is 3-10 min, and the diameter of the stainless steel mold is 8-20 mm; 5) The cold-pressed mixed powder is placed in a graphite crucible and placed in an ultra-high temperature induction heating pressureless sintering furnace for pressureless sintering in a vacuum, the heating rate is 80-100 ℃ / min, the sintering temperature is 2400-2450 ℃, and the sintering time is 0.5-1 h; 6) After the end of the holding, the temperature is decreased to 800-1000 ℃ at a rate of 60-100 ℃ / min, and then the furnace is cooled to room temperature, to obtain a high-entropy (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C ceramic material.

2. The high-entropy (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C ceramic material according to claim 1, characterized in that High-entropy (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C ceramic material realizes uniform solid solution of metal elements and rare earth element Y, and the particle size is uniform, being 2-3 μm.

3. The high-entropy (Hf 0.2 Y 0.2 W 0.2 Mo 0.2 Ti 0.2 )C ceramic material according to claim 1, characterized in that In step 1), the average particle size of the HfC powder is 0.8 μm, and the powder purity is ≥99wt%; the average particle size of the TiC powder is 1-3 μm, and the powder purity is ≥99.5wt%; the average particle size of the WC powder is 1-2 μm, and the powder purity is ≥99.5wt%; The average particle size of the Mo2C powder is 1-2 μm, and the powder purity is ≥99.5wt%; the average particle size of the YH2 powder is 1-2 μm, and the powder purity is ≥99wt%; the average particle size of the C powder is 1-2 μm, and the powder purity is ≥99.9wt%.

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