CN108103387A - A kind of nanometer of WC particle enhances high chromium iron-base powder metallurgy material - Google Patents
A kind of nanometer of WC particle enhances high chromium iron-base powder metallurgy material Download PDFInfo
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- CN108103387A CN108103387A CN201611045675.3A CN201611045675A CN108103387A CN 108103387 A CN108103387 A CN 108103387A CN 201611045675 A CN201611045675 A CN 201611045675A CN 108103387 A CN108103387 A CN 108103387A
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- 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
- C22C32/0047—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 carbides, nitrides, borides or silicides as the main non-metallic constituents
- C22C32/0052—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 carbides, nitrides, borides or silicides as the main non-metallic constituents only carbides
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- 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
- C22C32/0084—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 carbon or graphite as the main non-metallic constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/006—Making ferrous alloys compositions used for making ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/02—Making ferrous alloys by powder metallurgy
- C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
- C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
- C22C33/0285—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5% with Cr, Co, or Ni having a minimum content higher than 5%
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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Abstract
A kind of nanometer of WC particle enhances high chromium iron-base powder metallurgy material, the high ferrochrome based composites of high-performance powder metallurgy enhanced by the preparation of high-energy ball milling combination hot pressing and sintering technique by nanometer WC particle.After 40h ball millings, powder average particle size is refined to about 5 μm, and the alloying elements such as Cu, Ni, Mo and C are fully solid-solution in Fe, forms crystalline state nanometer Fe based solid solutions, and WC phases do not occur substantially to decompose.Sintering temperature is improved by 900 DEG C to 950 DEG C, and sintering sample porosity drastically reduces, and density, hardness significantly improve；Continue to raise sintering temperature, density, the hardness of sample gradually increase, but occur decline phenomenon instead when being sintered for 1100 DEG C.When sintering temperature is at 1000 DEG C or more, ball-milled powder can be with fabricated in situ M in hot pressed sintering7C3Phase.When sintering temperature is 1000 DEG C, can obtain close to fully dense sintered state sample, hardness, the bending strength of sample reach 47.7HRC and 1952MPa respectively.
Description
Technical field
The present invention relates to a kind of powdered metallurgical materials more particularly to a kind of nanometer of WC particle to enhance high ferrochrome base powder metallurgy
Material.
Background technology
Iron-base powder metallurgy material is a kind of powdered metallurgical material of dosage maximum, is mainly used in constitutional detail, bearing
With abrasives etc..Iron-base powder metallurgy material has a systems such as at low cost, machinability is good, solderability is good, can be heat-treated
Row advantage.In recent years, high chromium iron-base powder metallurgy material is because with excellent obdurability, hardness and wear-resisting property, it has also become iron
The hot spot of base powder metallurgy material development.And granule enhancement type iron-base powder metallurgy material can be resistance to by reinforcement high rigidity, height
Mill performance and the high intensity of matrix, excellent toughness combine, thus are suitble to harsh in service condition（As temperature in use is high, profit
Slip difference etc.）Environment in use, be a kind of ideal, extremely potential new material.
High-energy ball milling（High-energy ball milling, HEBM）It is that a kind of to prepare alloy general with composite material
Technology.It is by the shock of abrading-ball, roll the effects that so that the generation welding repeatedly of mixed-powder in ball milling, fracture, again
Welding, so as to introduce defect（Such as stacking fault and dislocation）Or chemically react, greatly change starting powder performance and
Structure is finally prepared and forces solid solution, Ultra-fine Grained, non-crystalline material or synthesize new material.Hot pressed sintering（hot-press
sintering, HPS）It is a kind of more ripe technology of development, compared with traditional sintering method, hot pressed sintering can make metal
Powder is in lower temperature and high densification is realized in the shorter cycle, is especially preparing difficult shaping and sinter powder metal material
There is unique advantage in terms of material.
The content of the invention
The purpose of the invention is to improve the density and hardness of iron-base powder metallurgy material, devise a kind of using nanometer
WC particle enhances high chromium iron-base powder metallurgy material.
The technical solution adopted by the present invention to solve the technical problems is：
The raw material for preparing that nanometer WC particle enhances high chromium iron-base powder metallurgy material includes：Water atomization Fe powder, electrolysis Cr powder, electrolysis
Cu powder, electrolysis Ni powder, electrolysis Mo powder, aquadag powder and WC powder.
The preparation process that nanometer WC particle enhances high chromium iron-base powder metallurgy material is：Initial powder presses 95%（Fe-10Cr-
1Cu-1Ni-1Mo-2C）+5%WC（Mass fraction）It is matched, after being pre-mixed 48h, using the planetary ball of QM-2SP20-CL types
Grinding machine carries out high-energy ball milling under high-purity argon gas protection, and ball grinder material is stainless steel, and Material quality of grinding balls is tungsten carbide, ball material quality
Than for 8:1.Drum's speed of rotation is 226r/min, and rotating alt time is respectively 12min, and the acceleration, deceleration time is 10s.Often
During secondary sintering, 20g powder is taken, is fitted into the graphite jig that internal diameter is 20mm, and uses HP-12 × 12 × 12（The U.S.
Centorr Vacuum Industries）Hot pressing furnace is sintered shaping.It is evacuated to about 1.3 × 10-2WC will be contained after Pa
Grain enhances high ferrochrome based powders and is first heated to 400 DEG C from room temperature with the rate of 5 DEG C/min, then is heated with the rate of 20 DEG C/min
To 800 DEG C, heat preservation 20min, different target firing temperatures, heat preservation 30min are then warming up to the rate of 10 DEG C/min, then
Cool to sample with the furnace room temperature.Apply 50MPa axial compressive forces in heating and insulating process.
The detecting step that nanometer WC particle enhances high chromium iron-base powder metallurgy material is：Using D8 Advance type X-rays
Diffractometer and NETSCHSTA449C types differential scanning calorimeter analyze the phase composition and thermal behavior of ball-milled powder.Using
430 type scanning electron microscopic observations of Nova Nano SEM are through 4%（Volume fraction）Sintered specimen after nital corrosion it is aobvious
Micro-assembly robot and sample bending fracture apperance.Using the density of Archimedes method measurement sample, each sample is surveyed 3 times and is averaged.
Using TH320 types full Rockwell apparatus test hardness, applications load is 150kgf, dwell time 20s, in sample during test
Surface takes 5 points at random, finally calculates average value.
The beneficial effects of the invention are as follows：
After 40h ball millings, powder average particle size is refined to about 5 μm, and the alloying elements such as Cu, Ni, Mo and C are fully solid-solution in Fe
In, crystalline state nanometer Fe based solid solutions are formed, and WC phases do not occur substantially to decompose.Sintering temperature is improved by 900 DEG C to 950 DEG C, is burnt
Knot sample porosity drastically reduces, and density, hardness significantly improve；Continue to raise sintering temperature, density, the hardness of sample gradually increase
Add, but occur decline phenomenon instead when being sintered for 1100 DEG C.When sintering temperature is at 1000 DEG C or more, ball-milled powder is burnt in hot pressing
It can be with fabricated in situ M in knot7C3Phase.When sintering temperature is 1000 DEG C, can obtain close to fully dense sintered state sample, examination
Hardness, the bending strength of sample reach 47.7HRC and 1952MPa respectively.
Specific embodiment
Case study on implementation 1：
The raw material for preparing that nanometer WC particle enhances high chromium iron-base powder metallurgy material includes：Water atomization Fe powder, electrolysis Cr powder, electrolysis
Cu powder, electrolysis Ni powder, electrolysis Mo powder, aquadag powder and WC powder.Nanometer WC particle enhances high chromium iron-base powder metallurgy material
Preparation process is：Initial powder presses 95%（Fe-10Cr-1Cu-1Ni-1Mo-2C）+5%WC（Mass fraction）It is matched, is premixed
After closing 48h, high-energy ball milling, ball grinder material are carried out under high-purity argon gas protection using QM-2SP20-CL types planetary ball mill
For stainless steel, Material quality of grinding balls is tungsten carbide, and ball material mass ratio is 8:1.Drum's speed of rotation is 226r/min, rotating alt time
Respectively 12min, acceleration, deceleration time are 10s.Every time during sintering, 20g powder is taken, is packed into the graphite jig that internal diameter is 20mm
In, and use HP-12 × 12 × 12（U.S. Centorr Vacuum Industries）Hot pressing furnace is sintered shaping.It takes out true
Sky is to about 1.3 × 10-2The high ferrochrome based powders of WC particle enhancing will be contained after Pa to be first heated to from room temperature with the rate of 5 DEG C/min
400 DEG C, then 800 DEG C, heat preservation 20min are heated to the rate of 20 DEG C/min, difference is then warming up to the rate of 10 DEG C/min
Target firing temperature, heat preservation 30min, then cool to sample with the furnace room temperature.Apply 50MPa axis in heating and insulating process
To pressure.Nanometer WC particle enhances the detecting step of high chromium iron-base powder metallurgy material to spread out using D8 Advance type X-rays
Instrument and NETSCHSTA449C types differential scanning calorimeter is penetrated to analyze the phase composition and thermal behavior of ball-milled powder.Using
430 type scanning electron microscopic observations of Nova Nano SEM are through 4%（Volume fraction）Sintered specimen after nital corrosion it is aobvious
Micro-assembly robot and sample bending fracture apperance.Using the density of Archimedes method measurement sample, each sample is surveyed 3 times and is averaged.
Using TH320 types full Rockwell apparatus test hardness, applications load is 150kgf, dwell time 20s, in sample during test
Surface takes 5 points at random, finally calculates average value.
Case study on implementation 2：
After ball milling 20h, the grain size of mixed-powder reduces, most of powder in the case where abrading-ball rolls rolling and cold-heading effect soldering one
It rises, and is observed that there are the trace of tear in the edges and corners of powder in the form of sheets, show that soldering occurs in mechanical milling process for powder
It ruptures simultaneously；After 30h ball millings, since work-hardening effect is more notable, larger powder particle is gradually broken into
The smaller particle of size, the average grain diameter and particle size range of powder particle are obviously reduced；After 40h ball millings, powder size compared with
Powder size after 30h ball millings only slightly reduces, and powder more they tends to uniformly in shaft-like, the size such as near substantially at this time
Change, average powder diameter is about 5m.It can be seen that significant change has occurred in the shape and size of powder particle in mechanical milling process, with ball
Time consuming extends, and powder particle becomes more uniformly tiny.In addition to abrading-ball is to the effect of powder, due to powder, there are hard phase WC
Particle is exacerbated to the grinding of soft phase and fragmentation in powder so that the powder particle after ball milling becomes more even and fine
It is small.The grain size of powder is close after ball milling 30h and 40h, and after being primarily due to ball milling 30h, powder has stored substantial amounts of deformation
Can, hereafter intensity, hardness increase continue ball milling, deformation dislocation increase becomes more difficult, and powder fracture and cold welding tend to be flat
Weighing apparatus, thus the particle size of powder no longer occurs significantly to change.
Case study on implementation 3：
900 DEG C of sintered samples contain larger-size hole, and pore shape is in the hole of crackle shape and small pore-like, wherein crackle shape
Longitudinal size is about 2-3 μm or so, illustrates that sintering temperature is relatively low, and the diffusion between each element is not yet abundant, causes sintered sample
Not fine and close, there are still the intergranular borders of sintering initial powder；The SEM of sintered sample has homodisperse as at 950 DEG C
Hole, but bore hole size is obviously reduced, and occur it is big block, while 950 DEG C of main objects of sintered sample be mutually ferrite and
(Fe, Ni)23C6.This is because sintering temperature improves, atom has stronger diffusivity, and the phase counterdiffusion between element
It is more abundant with reacting so that 950 DEG C of sintered density is greatly improved compared with 900 DEG C；Sintered sample at 1000 DEG C and 1050 DEG C
Substantially do not observe hole, and a large amount of tiny, of different shapes raised phases occur, in block, dotted and tiny needle-shaped etc.
Variform, phase composition are mainly ferrite, M7C3And austenite.Think, alloying element has stronger expansion at a temperature of this
Inter-diffusion reaction occurs for the ability of dissipating so that sintered specimen can be generated close to full densification with M7C3Based on it is a variety of not
With the carbide of form；1100 DEG C of sintered sample patterns are mainly nearly round block shape, size compared with 1000 DEG C, 1050 DEG C of bigger, and
And the pearlite region being corroded can also be clearly visible and become larger, this illustrates that sintering temperature is increased to 1100 DEG C, carbide and base
Body crystal grain may grow up.In addition, there is apparent cementite phase diffraction maximum, while M in the sample of 1100 DEG C of sintering7C3Diffraction maximum
Remitted its fury.When to illustrate sintering temperature be 1100 DEG C, the cementite content showed increased in sample may cause M in sample7C3
Content Deng other carbide is reduced.
Case study on implementation 4：
It is raised with sintering temperature, the density and hardness of sintered sample is in downward trend after first raising.When sintering temperature is
At 900 DEG C, the density and hardness of sample is respectively 7.27g/cm3And 40.5HRC, when sintering temperature is increased to 950 DEG C, alloy
It is greatly improved when hardness and density are compared with 900 DEG C, density and hardness respectively reaches 7.58g/cm3And 46.8HRC.When sintering temperature is
At 1000 DEG C and 1050 DEG C, the density for being sintered sample is respectively 7.63g/cm3And 7.64g/cm3, consistency is more than 99.6%, simultaneously
Hardness more than 47.5HRC, contains 10% higher than what is prepared using mechanical alloying combination warm-pressing method（Mass fraction）NbC particles
Hardness 33HRC and Fe-Cr-Ni-Co-C the powdered metallurgical material heat of the Fe-Cu-Ni-Mo-C-P powdered metallurgical materials of enhancing
Treated hardness 40-43HRC.Increase is had exponent relation since elements diffusion speed is raised with sintering temperature, works as sintering temperature
For 900 DEG C when, each element diffusion velocity is relatively low；Sintering temperature is increased to 950 DEG C, and diffusion of alloy elements speed increases very
Soon, diffusion velocity increase necessarily causes crystal grain to be grown up, and by the inswept place of crystal boundary, a large amount of holes disappear, and make the density of material
Rise, the density and hardness of sintered sample are also significantly increased.In addition raised with sintering temperature, the plastic deformation ability of ferrous powder granules
It improves, and the reciprocation enhancing between each constituent element, sintering process progress is further promoted, is conducive to sintering densification.Therefore
Sintering can be obtained close to fully dense sample at 1000 DEG C and 1050 DEG C, and sintered sample has higher hardness.However,
The density of sintered sample declines at 1100 DEG C, it may be possible to which, since sintering temperature is higher, grain growth driving force is big, causes crystal boundary
Rate travel is more than stomata rate travel, and stomata is enclosed in intra-die and is difficult to discharge so that the porosity of sample increases.This
Outside, sintering temperature is higher, and crystal grain is more easily grown up, and sintered sample hardness may be caused to decline.
Case study on implementation 5：
Have a large amount of highdensity short and curved tear crest line items on sample bending fracture, dotted formation of crack from the middle part of section to four
The river pattern of week radiation has the feature of quasi-cleavage crack.Meanwhile there are some holes at some basin centers, this may
Due to small hole present in sintered sample, hole can cause strong stress concentration under the effect of external force, from into
For formation of crack.In addition, the tiny carbide generated in additional nanoscale WC particle and sintering process is under the effect of external force,
It may separate to form cavity with basis material, be eventually developed to as formation of crack.
Claims (4)
1. a kind of nanometer of WC particle enhances high chromium iron-base powder metallurgy material, preparing raw material includes：Water atomization Fe powder, electrolysis Cr
Powder, electrolysis Cu powder, electrolysis Ni powder, electrolysis Mo powder, aquadag powder and WC powder.
2. according to claim 1 nanometer of WC particle enhances high chromium iron-base powder metallurgy material, it is characterized in that nanometer WC
The preparation process that grain enhances high chromium iron-base powder metallurgy material is：Initial powder presses 95%（Fe-10Cr-1Cu-1Ni-1Mo-2C）+
5%WC（Mass fraction）It is matched, after being pre-mixed 48h, is protected using QM-2SP20-CL types planetary ball mill in high-purity argon gas
Shield is lower to carry out high-energy ball milling, and ball grinder material is stainless steel, and Material quality of grinding balls is tungsten carbide, and ball material mass ratio is 8:1；Ball mill turns
Speed is 226r/min, and rotating alt time is respectively 12min, and the acceleration, deceleration time is 10s；Every time during sintering, 20g powder is taken
End is fitted into the graphite jig that internal diameter is 20mm, and uses HP-12 × 12 × 12（U.S. CentorrVacuum
Industries）Hot pressing furnace is sintered shaping；It is evacuated to about 1.3 × 10-2WC particle will be contained after Pa enhances high ferrochrome base
Powder is first heated to 400 DEG C with the rate of 5 DEG C/min from room temperature, then is heated to 800 DEG C, heat preservation with the rate of 20 DEG C/min
Then 20min is warming up to different target firing temperatures, heat preservation 30min, then by sample with furnace cooling with the rate of 10 DEG C/min
But to room temperature；Apply 50MPa axial compressive forces in heating and insulating process.
3. according to claim 1 nanometer of WC particle enhances high chromium iron-base powder metallurgy material, it is characterized in that nanometer WC
The detecting step that grain enhances high chromium iron-base powder metallurgy material is：Using D8 Advance types X-ray diffractometers and
NETSCHSTA449C types differential scanning calorimeter analyzes the phase composition and thermal behavior of ball-milled powder；Using Nova Nano
430 type scanning electron microscopic observations of SEM are through 4%（Volume fraction）The microscopic structure of sintered specimen after nital corrosion and examination
Sample bends fracture apperance；Using the density of Archimedes method measurement sample, each sample is surveyed 3 times and is averaged；Using TH320
Type full Rockwell apparatus test hardness, applications load are 150kgf, dwell time 20s, take 5 at random in specimen surface during test
It is a, finally calculate average value.
4. according to claim 1 nanometer of WC particle enhances high chromium iron-base powder metallurgy material, it is characterized in that by 40h balls
After mill, powder average particle size is refined to about 5 μm, and the alloying elements such as Cu, Ni, Mo and C are fully solid-solution in Fe, is formed nanocrystalline
State Fe based solid solutions, and WC phases do not occur substantially to decompose；Sintering temperature is improved by 900 DEG C to 950 DEG C, and sintering sample porosity is drastically
It reduces, density, hardness significantly improve；Continuing to raise sintering temperature, density, the hardness of sample gradually increase, but in 1100 DEG C of burnings
Occurs decline phenomenon during knot instead；When sintering temperature is at 1000 DEG C or more, ball-milled powder can close in situ in hot pressed sintering
Into M7C3Phase；When sintering temperature is 1000 DEG C, can obtain close to fully dense sintered state sample, the hardness of sample, bending resistance
Intensity reaches 47.7HRC and 1952MPa respectively.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109249019A (en) * | 2018-10-24 | 2019-01-22 | 湖南大学 | A kind of alternating temperature sintering process of rich chromium cast iron |
| CN109457190A (en) * | 2018-06-27 | 2019-03-12 | 河源市山峰金属制品有限公司 | A kind of WC particle enhancing Fe base powder metallurgy material and preparation method thereof |
| CN109482889A (en) * | 2018-11-27 | 2019-03-19 | 湖南英捷高科技有限责任公司 | A kind of material and powder metallurgy preparation technique of motor turning constitutional detail ball bowl |
| CN111101049A (en) * | 2018-10-26 | 2020-05-05 | 青海民族大学 | In-situ NbC particle and iron-based amorphous alloy synergistically reinforced manganese steel-based composite material and preparation method thereof |
| CN114769602A (en) * | 2022-05-06 | 2022-07-22 | 中南大学 | Tungsten-rhenium solid alloy powder with nanocrystalline structure and preparation method and application thereof |
| CN115029606A (en) * | 2022-06-14 | 2022-09-09 | 西安稀有金属材料研究院有限公司 | Powder metallurgy preparation method of double-enhanced-phase high-chromium cast iron wear-resistant composite material |
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2016
- 2016-11-24 CN CN201611045675.3A patent/CN108103387A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109457190A (en) * | 2018-06-27 | 2019-03-12 | 河源市山峰金属制品有限公司 | A kind of WC particle enhancing Fe base powder metallurgy material and preparation method thereof |
| CN109249019A (en) * | 2018-10-24 | 2019-01-22 | 湖南大学 | A kind of alternating temperature sintering process of rich chromium cast iron |
| CN109249019B (en) * | 2018-10-24 | 2020-08-25 | 湖南大学 | Variable-temperature sintering process for 25% Cr high-chromium cast iron and product thereof |
| CN111101049A (en) * | 2018-10-26 | 2020-05-05 | 青海民族大学 | In-situ NbC particle and iron-based amorphous alloy synergistically reinforced manganese steel-based composite material and preparation method thereof |
| CN109482889A (en) * | 2018-11-27 | 2019-03-19 | 湖南英捷高科技有限责任公司 | A kind of material and powder metallurgy preparation technique of motor turning constitutional detail ball bowl |
| CN114769602A (en) * | 2022-05-06 | 2022-07-22 | 中南大学 | Tungsten-rhenium solid alloy powder with nanocrystalline structure and preparation method and application thereof |
| CN114769602B (en) * | 2022-05-06 | 2023-05-26 | 中南大学 | Tungsten-rhenium solid alloy powder with nanocrystalline structure, and preparation method and application thereof |
| CN115029606A (en) * | 2022-06-14 | 2022-09-09 | 西安稀有金属材料研究院有限公司 | Powder metallurgy preparation method of double-enhanced-phase high-chromium cast iron wear-resistant composite material |
| CN115029606B (en) * | 2022-06-14 | 2022-11-04 | 西安稀有金属材料研究院有限公司 | Powder metallurgy preparation method of double-reinforcement-phase high-chromium cast iron wear-resistant composite material |
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