CN113106281B - Preparation method of yttrium oxide doped tungsten-based nano composite powder and alloy thereof - Google Patents
Preparation method of yttrium oxide doped tungsten-based nano composite powder and alloy thereof Download PDFInfo
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- 239000000843 powder Substances 0.000 title claims abstract description 60
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 229910052721 tungsten Inorganic materials 0.000 title claims abstract description 58
- 239000010937 tungsten Substances 0.000 title claims abstract description 58
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 32
- 239000000956 alloy Substances 0.000 title claims abstract description 32
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 239000002114 nanocomposite Substances 0.000 title claims abstract description 18
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000002245 particle Substances 0.000 claims abstract description 22
- 238000005245 sintering Methods 0.000 claims abstract description 20
- 239000002131 composite material Substances 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 12
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 4
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims abstract 3
- 239000007788 liquid Substances 0.000 claims abstract 2
- 238000010438 heat treatment Methods 0.000 claims description 16
- 239000001257 hydrogen Substances 0.000 claims description 15
- 229910052739 hydrogen Inorganic materials 0.000 claims description 15
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 13
- 239000002243 precursor Substances 0.000 claims description 10
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- NGDQQLAVJWUYSF-UHFFFAOYSA-N 4-methyl-2-phenyl-1,3-thiazole-5-sulfonyl chloride Chemical compound S1C(S(Cl)(=O)=O)=C(C)N=C1C1=CC=CC=C1 NGDQQLAVJWUYSF-UHFFFAOYSA-N 0.000 claims description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 239000012159 carrier gas Substances 0.000 claims description 3
- 239000003638 chemical reducing agent Substances 0.000 claims description 3
- 238000005056 compaction Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 239000004570 mortar (masonry) Substances 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000000354 decomposition reaction Methods 0.000 claims description 2
- 150000002431 hydrogen Chemical class 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- 238000006722 reduction reaction Methods 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims 2
- 238000001035 drying Methods 0.000 claims 1
- 238000001704 evaporation Methods 0.000 claims 1
- 238000000227 grinding Methods 0.000 claims 1
- 238000007873 sieving Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 5
- 239000013078 crystal Substances 0.000 abstract description 4
- 229910001080 W alloy Inorganic materials 0.000 description 6
- 238000005728 strengthening Methods 0.000 description 5
- 239000006185 dispersion Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005551 mechanical alloying Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000002105 nanoparticle Substances 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000002173 high-resolution transmission electron microscopy Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000011224 oxide ceramic Substances 0.000 description 1
- 229910052574 oxide ceramic Inorganic materials 0.000 description 1
- 229910001175 oxide dispersion-strengthened alloy Inorganic materials 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- -1 rare earth yttrium oxide Chemical class 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- QBAZWXKSCUESGU-UHFFFAOYSA-N yttrium(3+);trinitrate;hexahydrate Chemical compound O.O.O.O.O.O.[Y+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O QBAZWXKSCUESGU-UHFFFAOYSA-N 0.000 description 1
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/05—Mixtures of metal powder with non-metallic powder
- C22C1/058—Mixtures of metal powder with non-metallic powder by reaction sintering (i.e. gasless reaction starting from a mixture of solid metal compounds)
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1003—Use of special medium during sintering, e.g. sintering aid
- B22F3/1007—Atmosphere
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1039—Sintering only by reaction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/105—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
- C22C27/04—Alloys based on tungsten or molybdenum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/001—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides
- C22C32/0015—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides with only single oxides as main non-metallic constituents
- C22C32/0031—Matrix based on refractory metals, W, Mo, Nb, Hf, Ta, Zr, Ti, V or alloys thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/105—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding
- B22F2003/1051—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding by electric discharge
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
Abstract
A preparation method of yttrium oxide doped tungsten-based nano composite powder and an alloy thereof belongs to the technical field of tungsten-based materials. First, Y is introduced by liquid-liquid mixing 2 O 3 And combining with the thermal plasma synthesis technology to obtain W-Y 2 O 3 Nano composite powder; and then sintering the tungsten-based composite powder by adopting a traditional sintering method, thereby obtaining the tungsten-based alloy with high density and yttrium oxide particles dispersed in tungsten crystal particles. Relative Density of sintered tungsten-based alloy of the invention>98 percent, tungsten crystal grain size of about 970nm and yttrium oxide particle size of 100nm, and the prepared W-Y 2 O 3 The alloy has high thermal conductivity of 96 W.m ‑1 ·K ‑1 (500℃)。
Description
Technical Field
The invention relates to a preparation method of tungsten-based nano composite powder and a tungsten-based alloy, in particular to a preparation method of yttrium oxide doped tungsten-based nano composite powder and an alloy thereof, belonging to the technical field of tungsten-based materials.
Background
The tungsten-based alloy has the characteristics of high melting point, good heat conductivity, good radiation resistance and the like, and is widely applied to the fields of aerospace, nuclear industry, electronic chemical industry and the like. The metal tungsten has the problems of low recrystallization temperature, low temperature brittleness and the like, and the application of the tungsten in the actual production is restricted. Y is 2 O 3 High melting point and good high-temperature stability, and is often used as a dispersion strengthening phase of tungsten. In the sintering process, the yttrium oxide can not only inhibit the growth of tungsten grains, but also improve the recrystallization temperature of the tungsten alloy and improve the toughness of the tungsten alloy. Therefore, the preparation of the yttrium oxide dispersion strengthening tungsten-based alloy is an important means for improving the performance of the tungsten material.
The dispersion strengthening effect of yttrium oxide on the tungsten alloy is related to the size, distribution and dispersity of yttrium oxide particles in the alloy; however, the yttria particles dispersed in the alloy tend to agglomerate and grow (even to micron size) at the tungsten grain boundaries, which greatly inhibits the strengthening effect of the oxide on the tungsten alloy. At present, the yttrium oxide dispersion strengthening tungsten alloy mainly adopts a powder metallurgy preparation process, and the structural characteristics of the prepared composite material are determined to a great extent by the characteristics of the powder material, so that the tungsten-based nano composite powder material with uniform structure and high performance is provided, which can be beneficial to the preparation of the high-performance tungsten-based alloy.
The nano-scale composite powder has lower sintering activity and can solve the problem of difficult sintering of tungsten alloy, but nano-particles have nano-functional energy, so that the nano-particles are mutually agglomerated, which is also a great difficulty in preparing high-performance nano-composite powder. The existing preparation method of the nano composite powder mainly has the defects of a mechanical alloying method and a wet chemical method. The mechanical alloying method is to mix the metal tungsten and the yttrium oxide ceramic particles and then carry out ball milling by a high-energy ball mill, and the obtained powder has irregular shape and is easy to introduce impurities. In recent years, a great deal of research is carried out on nano composite powder prepared by a wet chemical method, but the technological process is strict and the preparation process is complex.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problem to be solved by the invention is to provide a method for synthesizing W-Y nano composite powder with uniform structure and high performance by adopting plasma 2 O 3 And sintering the tungsten-based composite powder by adopting a traditional sintering method to obtain the tungsten-based alloy with high compactness and yttrium oxide dispersed in tungsten crystal grains.
A preparation method of yttrium oxide doped tungsten-based nano composite powder and an alloy thereof comprises the following steps:
step 1: preparation of powder precursor
Adding a certain amount of yttrium nitrate (Y (NO) 3 ) 3 ·6H 2 O, aladdin with the purity of more than or equal to 99.9 percent) and ammonium metatungstate (AMT, aladdin with the purity of more than or equal to 99.95 percent) are respectively dissolved in a certain amount of deionized water, mixed and stirred uniformly, heated, stirred and evaporated to dryness at 80 ℃, dried in an oven at 80 ℃ for 12 hours, and the dried agglomerates are ground into fine powder by an agate mortar and sieved by a 100-mesh sieve to obtain precursor powder.
Preferably, the yttrium nitrate is present in the precursor powder in an amount of 0.5 to 3wt%.
Step 2: thermal plasma synthesis
Sending the precursor powder obtained in the step 1 into an argon plasma torch through carrier gas hydrogen, wherein the hydrogen flow is 200ml/min, the powder sending rate is 10g/min, and the hydrogen is also used as a reducing agent; and after the decomposition reduction reaction is finished, the product enters a cooling cavity, and after the product is cooled for 24 hours, spherical nano composite powder with uniform particle size distribution is collected at the bottom of the cavity, wherein the particle size of the powder is about 30nm.
And step 3: powder compaction
Putting the spherical nano composite powder obtained in the step 2 into a stainless steel mold, and then carrying out cold press molding on a press machine, wherein the preferable pressing pressure is 400MPa, and the pressure maintaining time is 5min;
and 4, step 4: sintering process
Putting the pressed blank obtained in the step 3 into a burning boat, then pushing the burning boat into a heating area of a tube furnace, and sintering in a hydrogen atmosphere, wherein the hydrogen flow is 300ml/min; after sintering, heating to 900 ℃ at a heating rate of 10 ℃/min, and preserving heat for 60min, and then heating to 1600 ℃ at a heating rate of 5 ℃/min, and preserving heat for 60min; after the heat preservation is finished, the temperature is reduced to 600 ℃ at the speed of 10 ℃/min, and then the tungsten-based alloy block is cooled to room temperature along with the furnace to obtain the tungsten-based alloy block.
The invention has the beneficial effects that:
the invention provides a method for preparing nano-grade rare earth yttrium oxide doped tungsten-based composite powder, which combines the traditional sintering mode to prepare a tungsten-based alloy with high density and nano yttrium oxide dispersed and distributed in tungsten crystals. The particle size of the prepared nano-grade tungsten-based composite powder is about 30nm, and the yttrium oxide component is uniformly distributed in the tungsten particles; relative density of tungsten-based alloy after sintering>98 percent, the tungsten grain size is about 1 mu m, the yttrium oxide grain size is 100nm, and the prepared W-Y 2 O 3 The alloy has high thermal conductivity of 96 W.m -1 ·K -1 (500℃)。
Drawings
FIG. 1 is W-Y 2 O 3 SEM of the composite powder. As can be seen from FIG. 1, the powder particles are fine and uniformAnd (4) homogenizing.
FIG. 2 is W-Y 2 O 3 TEM of the composite powder. As can be seen from FIG. 2, the powder particle size is about 30nm.
FIG. 3 is W-Y 2 O 3 In the HRTEM of the composite powder, it can be seen from fig. 3 that the tungsten particle lattice is distorted.
FIG. 4 is W-Y 2 O 3 In the MAPPING diagram of the composite powder, it can be seen from FIG. 4 that the Y and O elements are uniformly distributed in the non-particle state.
Fig. 5 is a fracture SEM of the tungsten-based alloy after sintering.
FIG. 6 is a TEM of the sintered tungsten-based alloy, and it can be seen from FIG. 6 that the yttrium oxide particles are dispersed in the tungsten grains.
Detailed Description
The following describes the technical solution of the present invention in detail, but the present invention is not limited to the following examples.
Example 1:
the preparation method of the yttrium oxide dispersion strengthened tungsten-based alloy in the embodiment comprises the following steps:
step 1: preparation of powder precursor
500g of ammonium metatungstate (AMT, aladdin, purity is more than or equal to 99.95%) and 12.7g of yttrium nitrate hexahydrate (Y (NO) 3 ) 3 ·6H 2 O, aladdin, the purity is more than or equal to 99.9 percent) are respectively dissolved in 2000ml of deionized water, the mixture is uniformly mixed and stirred, the solution is heated, stirred and evaporated to dryness at 80 ℃, then the dried solution is dried in an oven at 80 ℃ for 12 hours, the dried agglomeration is ground into fine powder by an agate mortar, and the fine powder is sieved by a 100-mesh sieve.
And 2, step: thermal plasma synthesis
500g of precursor powder is fed into an argon plasma torch through carrier gas (hydrogen), the hydrogen flow is 200ml/min, the powder feeding rate is 10g/min, and the hydrogen is also used as a reducing agent. After the reaction is finished, the powder enters a cooling cavity, and after the powder is cooled for 24 hours, the W-Y is collected at the bottom of the cavity 2 O 3 Composite powder (Y) 2 O 3 Occupy W-Y 2 O 3 1% of the total mass of the composite powder).
And 3, step 3: powder compaction
And (3) filling 0.8g of tungsten-based composite powder into a stainless steel mold with the inner diameter of 10mm, and then performing cold press molding on the tungsten-based composite powder on a press machine, wherein the pressure is 400MPa, and the pressure maintaining time is 5min.
And 4, step 4: sintering process
Putting the pressed compact into a burning boat, then pushing the burning boat into a heating area of a tube furnace, and sintering in a hydrogen atmosphere, wherein the hydrogen flow is 300ml/min; after sintering, firstly heating to 900 ℃ at the heating rate of 10 ℃/min, and preserving heat for 60min, and then heating to 1600 ℃ at the heating rate of 5 ℃/min, and preserving heat for 60min; after the heat preservation is finished, the temperature is reduced to 600 ℃ at the speed of 10 ℃/min, and then the tungsten-based alloy block is cooled to room temperature along with the furnace to obtain the tungsten-based alloy block.
The particle size of the nano-grade tungsten-based composite powder prepared by the invention is about 30nm, and the yttrium oxide component is uniformly distributed in the tungsten particles; the relative density of the sintered tungsten-based alloy is more than 98%, the grain size is about 970nm, and yttrium oxide particles are dispersed and distributed in tungsten grains.
The above embodiments describe the technical solution of the present invention in detail. It will be clear that the invention is not limited to the described embodiments. Various changes may be made by those skilled in the art based on the embodiments of the invention, and any changes which are equivalent or similar to the embodiments of the invention are intended to be within the scope of the invention.
Claims (2)
1. A preparation method of yttrium oxide doped tungsten-based nano composite powder and an alloy thereof is characterized by comprising the following steps:
step 1: preparation of powder precursor
Mixing a certain amount of molecular formula Y (NO) 3 ) 3 ·6H 2 Respectively dissolving O, yttrium nitrate with the purity of more than or equal to 99.9 percent and ammonium metatungstate with the purity of more than or equal to 99.95 percent in a certain amount of deionized water, mixing and stirring uniformly, heating and stirring at 80 ℃, evaporating the liquid to dryness, then drying in an oven at 80 ℃ for 12 hours, grinding the dried agglomerates into fine powder by using an agate mortar, and sieving by using a 100-mesh sieve to obtain precursor powder; the content of yttrium nitrate in the precursor powder is 0.5-3wt%;
step 2: thermal plasma synthesis
Sending the precursor powder obtained in the step 1 into an argon plasma torch through carrier gas hydrogen, wherein the hydrogen flow is 200mL/min, the powder sending rate is 10g/min, and the hydrogen is also used as a reducing agent; after the decomposition reduction reaction is finished, the product enters a cooling cavity, and spherical nano composite powder with uniform particle size distribution is collected at the bottom of the cavity after being cooled for 24 hours, wherein the particle size of the spherical nano composite powder is 30nm;
and 3, step 3: powder compaction
Putting the spherical nano composite powder obtained in the step 2 into a stainless steel mold, and then carrying out cold press molding on a press machine, wherein the pressing pressure is 400MPa, and the pressure maintaining time is 5min;
and 4, step 4: sintering process
Putting the pressed blank obtained in the step 3 into a burning boat, then pushing the burning boat into a heating area of a tube furnace, and sintering in a hydrogen atmosphere, wherein the hydrogen flow is 300mL/min; after sintering, firstly heating to 900 ℃ at the heating rate of 10 ℃/min, and preserving heat for 60min, and then heating to 1600 ℃ at the heating rate of 5 ℃/min, and preserving heat for 60min; after the heat preservation is finished, the temperature is reduced to 600 ℃ at the speed of 10 ℃/min, and then the tungsten-based alloy block is cooled to room temperature along with the furnace to obtain the tungsten-based alloy block.
2. The yttrium oxide doped tungsten-based alloy prepared by the method of claim 1, wherein the particle size of the nano-scale tungsten-based composite powder is 30nm, and yttrium oxide components are uniformly distributed in tungsten particles; relative density of tungsten-based alloy after sintering>98 percent of tungsten grain with the size of 1 mu m and the grain size of yttrium oxide with the size of 100nm, and the prepared W-Y 2 O 3 The alloy has high thermal conductivity, and the thermal conductivity at 500 ℃ is 96 W.m -1 ·K -1 。
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