CN114606406A - NbCr2Bonded WCrRuTaV hard alloy and preparation method thereof - Google Patents
NbCr2Bonded WCrRuTaV hard alloy and preparation method thereof Download PDFInfo
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- CN114606406A CN114606406A CN202210100404.2A CN202210100404A CN114606406A CN 114606406 A CN114606406 A CN 114606406A CN 202210100404 A CN202210100404 A CN 202210100404A CN 114606406 A CN114606406 A CN 114606406A
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- 239000000956 alloy Substances 0.000 title claims abstract description 86
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 83
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 239000000843 powder Substances 0.000 claims abstract description 71
- 239000011230 binding agent Substances 0.000 claims abstract description 12
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 10
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 9
- 229910052751 metal Inorganic materials 0.000 claims abstract description 6
- 238000000498 ball milling Methods 0.000 claims description 33
- 238000005245 sintering Methods 0.000 claims description 32
- 238000000034 method Methods 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 10
- 229910052715 tantalum Inorganic materials 0.000 claims description 8
- 238000005303 weighing Methods 0.000 claims description 8
- 229910052707 ruthenium Inorganic materials 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 239000011261 inert gas Substances 0.000 claims description 6
- 238000004886 process control Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000004663 powder metallurgy Methods 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 150000002739 metals Chemical class 0.000 claims description 3
- 238000005551 mechanical alloying Methods 0.000 abstract description 4
- 238000002490 spark plasma sintering Methods 0.000 abstract description 4
- 239000003870 refractory metal Substances 0.000 abstract description 3
- 229910052721 tungsten Inorganic materials 0.000 abstract description 3
- 238000009826 distribution Methods 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract 1
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 12
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 8
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 238000003723 Smelting Methods 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000005275 alloying Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 229910001068 laves phase Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000004626 scanning electron microscopy Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 1
- 229910052726 zirconium Inorganic materials 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
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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
-
- 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
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
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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
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/043—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by ball milling
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Abstract
The invention discloses a hard alloy made of NbCr2The WCrRuTaV refractory high-entropy hard alloy used as a binder and the preparation method thereof are characterized in that refractory metal elements of W, Cr, Ru, Ta and V are used as raw materials, high-entropy hard alloy powder is prepared by mechanical alloying, and the high-entropy hard alloy powder and NbCr are mixed2And after the powder is uniformly mixed, performing spark plasma sintering to obtain the block hard alloy material. NbCr obtained by the invention2The bonded WCrRuTaV refractory high-entropy hard alloy has superfine grain size and higher compactness, and meanwhile, the hard alloy has uniform component distribution and excellent performance, thereby having good application prospect.
Description
Technical Field
The invention relates to the technical field of hard alloy materials, in particular to NbCr2Bonded WCrRuTaV difficultiesA melting high-entropy hard alloy and a preparation method thereof.
Background
The hard alloy is mainly a wear-resistant alloy material with higher hardness and strength, is widely applied to the machining industry, and is mainly used for manufacturing cutting tools, wear-resistant parts, dies and the like. However, in recent years, with the development of some difficult-to-machine materials and the mechanical processing industry, higher requirements are put on the high-temperature performance of the hard alloy cutter under the complicated working conditions. The refractory metal generally refers to tungsten, molybdenum, niobium, tantalum, vanadium, zirconium and the like, and has excellent properties of high refractoriness, good high-temperature strength, high-temperature corrosion resistance and the like. At present, high-entropy hard alloy consisting of refractory metal elements is mostly prepared by a smelting method. However, because the melting points of the main elements are high, serious component segregation is easy to occur in the high-entropy hard alloy smelting process to influence the performance of the alloy, and the service life of smelting equipment is short; meanwhile, the high-entropy refractory hard alloy always shows a brittleness tendency at room temperature, so that the cast ingot is difficult to process. Laves phase NbCr2Is a novel high-temperature alloy, has excellent performances of high melting point, high hardness, high-temperature oxidation resistance and the like, and is a good novel adhesive (Nie Xiaowu. Laves phase NbCr)2Mechanical properties of (2) and its use [ M]The success rate is as follows: southwest university of transportation publishers, 1 month 2020, ISBN 978-7-5643-.
Based on the NbCr, the invention designs the NbCr2A bonded WCrRuTaV refractory high-entropy hard alloy and a preparation method thereof, which aim to solve the problems.
Disclosure of Invention
The invention aims to provide NbCr2A bonded WCrRuTaV refractory high-entropy hard alloy and a preparation method thereof are used for solving the processing problem of a material difficult to process.
In order to achieve the purpose, the invention provides the following technical scheme: NbCr2The bonded WCrRuTaV refractory high-entropy hard alloy comprises the following metals in atomic percentage: w: 10% -50%, Cr: 10% -50%, Ru: 10% -50%, Ta: 10% -50%, V: 10 to 50 percent.
Preferably, the NbCr2The powder is used as a sintering binder of the high-entropy hard alloy powder.
Preferably, the refractory high-entropy hard alloy with equal atomic percent comprises the following components: w: 32.31 wt%, Cr: 9.14 wt%, Ru: 17.76 wt%, Ta: 31.82 wt%, V: 8.97 wt%, NbCr2：9.09wt％。
The invention also provides NbCr2The preparation method of the bonded WCrRuTaV refractory high-entropy hard alloy specifically comprises the following steps:
1) weighing of original powder: weighing each element powder according to the component proportion of the alloy, and preliminarily mixing;
2) preparing alloy powder: adding the powder obtained in the step 1) and grinding balls with different sizes into a ball milling tank, adding a process control agent under the protection of inert gas, and carrying out star ball milling to prepare high-entropy hard alloy powder;
3) preparation of sintering powder: adding the binder into the high-entropy hard alloy powder obtained in the step 2) under the protection of the inert gas to obtain the NbCr2The powder and the process control agent are subjected to ball milling and mixing to prepare (WCrRuTaV) NbCr2Sintering the powder;
4) powder metallurgy preparation of the alloy: the (WCrRuTaV) NbCr obtained in the step 3)2And (3) carrying out discharge plasma sintering on the sintering powder, wherein the sintering process parameters are as follows: the sintering temperature is 1200-1700 ℃, the sintering pressure is 40-60 MPa, the heating rate is 50-100 ℃/min, and the heat preservation time is 30-50 min;
5) when the sample is cooled to below 100 ℃ along with the furnace, the pressure is relieved and the (WCrRuTaV) NbCr is taken out2Bulk samples.
Preferably, the planetary ball milling parameters in step 2) are as follows: the ball-material ratio is 12: 1-15: 1, the ball milling rotation speed is 300-400 r/min, and the ball milling time is 20-40 h.
Preferably, the binder in step 3) is said NbCr2The addition amount of the powder is 5-15% of the mass of the high-entropy hard alloy powder.
Preferably, the ball milling and mixing process parameters in the step 3) are as follows: the ball milling speed is 100-150 r/min, and the mixing time is 20-30 h.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention adopts planetary ball milling, the alloying is gradually formed by the repeated collision between the powder and the milling balls, and the high-entropy hard alloy powder is prepared by a mechanical alloying method, so that the composition segregation caused by a melting method can be effectively avoided.
(2) The method adopts spark plasma sintering, can obtain the high-entropy hard alloy block material with fine grains, uniform components, compact structure and good performance without heating the material to be completely melted, and can obtain (approximate) the shape of a component by sintering in a specific die, thereby avoiding the problem of difficult processing of the high-entropy hard alloy cast ingot, and having the characteristics of simple operation, high production efficiency, energy conservation, environmental protection and the like in the process.
(3) The invention adopts NbCr2The powder is used as a powder metallurgy binder of the high-entropy hard alloy, the mechanical property of the hard alloy can be further improved, and the obtained NbCr2The bonded WCrRuTaV refractory high-entropy hard alloy has superfine grain size and higher density, and meanwhile, the components of the alloy are uniformly distributed and have excellent performance, so that the preparation channel of the refractory high-entropy hard alloy is expanded.
Drawings
FIG. 1 shows an example of the present invention (WCrRuTaV) NbCr2Scanning electron microscope morphology of the sintered powder;
FIG. 2 shows an embodiment of the present invention (WCrRuTaV) NbCr2The sintered mass was subjected to scanning electron microscopy.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.
The invention provides a technical scheme that: NbCr2The bonded WCrRuTaV refractory high-entropy hard alloy comprises the following metals in atomic percentage: w: 10% -50%, Cr: 10% -50%, Ru: 10% -50%, Ta: 10% -50%, V: 10 to 50 percent.
Further, NbCr2The powder is used as a sintering binder of the high-entropy hard alloy powder, has good wettability, high hardness and high melting point, and the prepared high-entropy hard alloy has superfine grain size and higher density, and has uniform component distribution and excellent performance.
Further, the crystal structure of the obtained refractory high-entropy hard alloy is a simple face centered cubic (BCC) structure, a body centered cubic (FCC) structure and an intermetallic compound.
Further, the refractory high-entropy hard alloy with equal atomic percent comprises the following components: w: 32.31 wt%, Cr: 9.14 wt%, Ru: 17.76 wt%, Ta: 31.82 wt%, V: 8.97 wt%, NbCr2：9.09wt％。
The invention also provides NbCr2The preparation method of the bonded WCrRuTaV refractory high-entropy hard alloy specifically comprises the following steps:
1) weighing of the original powder: weighing each element powder according to the component proportion of the alloy, and preliminarily mixing, wherein the purity of the elementary powder of the five elements of W, Cr, Ru, Ta and V is more than or equal to 99.9%;
2) preparing alloy powder: adding the powder obtained in the step 1) and grinding balls with different sizes into a ball milling tank, adding a process control agent n-heptane and carrying out star-type ball milling under the protection of inert gas argon to prepare high-entropy hard alloy powder, reducing the oxidation of metal powder in the process of the star-type ball milling, and refining crystal grains and gradually forming alloying through repeated collision between the powder and the grinding balls;
3) preparation of sintering powder: adding a binder NbCr into the high-entropy hard alloy powder obtained in the step 2) under the protection of inert gas argon2Powder and process control agent n-heptane and ball milling mixing to prepare (WCrRuTaV) NbCr2Sintered powder, NbCr2The powder is used as a bonding agent, so that the sintering temperature of the high-entropy hard alloy is reduced, the obtained high-entropy hard alloy has superfine grain size and higher density, the components of the alloy are uniformly distributed, and the high-entropy hard alloy has excellent performance;
4) powder metallurgy preparation of the alloy: the (WCrRuTaV) NbCr obtained in the step 3)2The sintering powder is subjected to spark plasma sintering to solidify the high-entropy hard alloy powder to obtain (WCrRuTaV) NbCr2Sintering the block body, wherein the sintering process parameters are as follows: the sintering temperature is 1200-1700 ℃, the sintering pressure is 40-60 MPa, the heating rate is 50-100 ℃/min, and the heat preservation time is 30-50 min;
5) when the sample is cooled to below 100 ℃ along with the furnace, the pressure is relieved and the (WCrRuTaV) NbCr is taken out2Bulk samples.
Further, the planetary ball milling parameters in the step 2) are as follows: the ball-material ratio is 12: 1-15: 1, the ball milling rotation speed is 300-400 r/min, and the ball milling time is 30-50 h.
Further, the binder NbCr in the step 3)2The addition amount of the powder is 5-15% of the mass of the high-entropy hard alloy powder.
Further, the ball milling mixing process parameters in the step 3) are as follows: the ball milling speed is 100-150 r/min, and the mixing time is 20-30 h.
One specific application of this embodiment is: the refractory high-entropy hard alloy comprises the following components in atomic percentage: the refractory high-entropy hard alloy with equal atomic percent comprises the following elements in a molar ratio of W: cr: ru: ta: and V is 1: 1: 1: 1: 1.
the NbCr2The preparation method of the bonded WCrRuTaV refractory high-entropy hard alloy comprises the following steps:
step 1) weighing of original powder: weighing element powder according to the component proportion of the high-entropy hard alloy with equal atomic percent, wherein W: 25.848g, Cr: 7.312g, Ru: 14.208g, Ta: 25.456g, V: 7.176g, 80g in total, and carrying out primary mixing in a powder mixer;
step 2) preparation of alloy powder: pouring the primarily mixed powder into a hard alloy ball milling tank, and putting hard alloy balls according to a ball-to-material ratio of 15: 1; putting the ball milling tank into a transition cabin of a vacuum glove box, vacuumizing, filling argon into the cabin to enable the powder to be in an argon protection state, then transferring the ball milling tank to a working cabin of the glove box, adding a little n-heptane into the tank, and sealing; taking out the ball milling tank, placing the ball milling tank in a planetary ball mill, and preparing high-entropy hard alloy powder by mechanical alloying, wherein the rotating speed of the ball mill is 350r/min, and the ball milling time is 40 h;
step 3) preparation of sintering powder: adding NbCr into a ball milling tank for completing mechanical alloying in a vacuum glove box2The powder is used as a binder of WCrRuTaV high-entropy hard alloy powder, and the addition amount of the powder is 10 wt% of the mass of the high-entropy hard alloy powder, namely 8 g; after adding a little n-heptane, mixing of the powders was performed in a ball mill to prepare (WCrRuTaV) NbCr2Sintering the powder, wherein the rotating speed of the ball mill is 150r/min, and the powder mixing time is 20 h; after mixing, vacuum drying treatment is carried out to obtain (WCrRuTaV) NbCr2Sintered powder (WCrRuTaV, FIG. 1, NbCr)2SEM of sintered powder);
step 4), powder metallurgy preparation of the alloy: (WCrRuTaV) NbCr obtained by adopting spark plasma sintering process2Sintering refractory high-entropy hard alloy powder with the inner diameter of
The high-strength graphite mold is used as a sintering mold; the sintering process parameters are as follows: the sintering temperature is 1400 ℃, the sintering pressure is 50MPa, the heating rate is 100 ℃/min, and the heat preservation time is 40 min;
step 5) when the sample is cooled to below 100 ℃ along with the furnace, the pressure is removed and the sintered (WCrRuTaV) NbCr is taken out2Bulk sample of size
(FIG. 2 is (WCrRuTaV) NbCr2Bulk sample texture SEM) of NbCr2The components of the bonded WCrRuTaV refractory high-entropy hard alloy are W: 32.31 wt%, Cr: 9.14 wt%, Ru: 17.76 wt%, Ta: 31.82 wt%, V: 8.97 wt%, NbCr2：9.09wt％。
NbCr obtained in this example2The bonded WCrRuTaV refractory high-entropy hard alloy is in a BCC and FCC structure, has superfine grain size and higher compactness, and has a hardness value as high as 5583.7HV and a relative density of 88.91%.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (7)
1. NbCr2The bonded WCrRuTaV refractory high-entropy hard alloy is characterized in that: the high-entropy hard alloy comprises the following metals in atomic percentage: w: 10-50%, Cr: 10% -50%, Ru: 10% -50%, Ta: 10% -50%, V: 10 to 50 percent.
2. NbCr according to claim 12The bonded WCrRuTaV refractory high-entropy hard alloy is characterized in that: the NbCr2The powder is used as a sintering binder of the high-entropy hard alloy powder.
3. NbCr according to claim 12The bonded WCrRuTaV refractory high-entropy hard alloy is characterized in that: the refractory high-entropy hard alloy with equal atomic percent comprises the following components: w: 32.31 wt%, Cr: 9.14 wt%, Ru: 17.76 wt%, Ta: 31.82 wt%, V: 8.97 wt%, NbCr2：9.09wt％。
4. NbCr2The preparation method of the bonded WCrRuTaV refractory high-entropy hard alloy is characterized by comprising the following steps of: the method specifically comprises the following steps:
1) weighing of the original powder: weighing each element powder according to the component proportion of the alloy, and preliminarily mixing;
2) preparing alloy powder: adding the powder obtained in the step 1) and grinding balls with different sizes into a ball milling tank, adding a process control agent under the protection of inert gas, and carrying out star ball milling to prepare high-entropy hard alloy powder;
3) preparation of sintering powder: adding the binder into the high-entropy hard alloy powder obtained in the step 2) under the protection of the inert gas to obtain the NbCr2The powder and the process control agent are subjected to ball milling and mixing to prepare (WCrRuTaV) NbCr2Sintering the powder;
4) powder metallurgy preparation of the alloy: the (WCrRuTaV) NbCr obtained in the step 3)2And (3) carrying out discharge plasma sintering on the sintering powder, wherein the sintering process parameters are as follows: the sintering temperature is 1200-1700 ℃, the sintering pressure is 40-60 MPa, the heating rate is 50-100 ℃/min, and the heat preservation time is 30-50 min;
5) when the sample is cooled to below 100 ℃ along with the furnace, the pressure is relieved and the (WCrRuTaV) NbCr is taken out2Bulk samples.
5. NbCr according to claim 42The preparation method of the bonded WCrRuTaV refractory high-entropy hard alloy is characterized by comprising the following steps of: step 2) the planetary ball milling parameters are as follows: the ball-material ratio is 12: 1-15: 1, the ball milling rotation speed is 300-400 r/min, and the ball milling time is 30-50 h.
6. NbCr according to claim 42The preparation method of the bonded WCrRuTaV refractory high-entropy hard alloy is characterized by comprising the following steps of: the binder in the step 3) is NbCr2The addition amount of the powder is 5-15% of the mass of the high-entropy hard alloy powder.
7. NbCr according to claim 42High entropy of bonded WCrRuTaV refractoryThe preparation method of the hard alloy is characterized by comprising the following steps: the ball milling mixing process parameters in the step 3) are as follows: the ball milling speed is 100-150 r/min, and the mixing time is 20-30 h.
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Application publication date: 20220610 |