CN110129645A - A kind of multi-functional tungsten alloy functionally gradient material (FGM) and preparation method thereof - Google Patents
A kind of multi-functional tungsten alloy functionally gradient material (FGM) and preparation method thereof Download PDFInfo
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- CN110129645A CN110129645A CN201910440857.8A CN201910440857A CN110129645A CN 110129645 A CN110129645 A CN 110129645A CN 201910440857 A CN201910440857 A CN 201910440857A CN 110129645 A CN110129645 A CN 110129645A
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- 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
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- 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
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- B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
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- B22F9/00—Making metallic powder or suspensions thereof
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Abstract
The invention discloses a kind of multi-functional tungsten alloy functionally gradient material (FGM)s and preparation method thereof.The multi-functional tungsten alloy functionally gradient material (FGM) is according to from one end of the material to the direction of the other end, including two material segments, leading portion material are made of tungsten and metallic addition, and wherein tungsten weight percentage ranges are 93-98%；Back segment material is made of tungsten and metallic addition, and wherein tungsten weight percentage ranges are 88-93%, and the W content of leading portion material is greater than the W content of back segment material.According to application demand, it is desirable that leading portion has higher-strength, and back segment has higher toughness.The preparation method of the multi-functional tungsten alloy functionally gradient material (FGM) includes: the preparation step of tungsten alloy powder, compression moulding step, sintering step and heat treatment step.The tungsten alloy functionally gradient material (FGM) that the present invention prepares has good comprehensive mechanical property.
Description
Technical field
The present invention relates to metal material field, in particular to a kind of multi-functional tungsten alloy functionally gradient material (FGM) and preparation method thereof.
Background technique
Tungsten alloy is one kind using tungsten as matrix, and the metal alloy of other elements composition is added.Tungsten has fusing point height, than great
The characteristics of, and addition other elements are designed by reasonable ingredient, the big characteristic of tungsten brittleness itself can be improved, have more alloy
Practicability, flexibility.It is developed by the effort of domestic and foreign scholars, tungsten and tungsten alloy have obtained a series of excellent properties: intensity
Height, ductility is good, and machinability is good, and thermal expansion coefficient is small, and thermal coefficient is big, excellent alpha ray shield effect, anti-oxidant and anti-corruption
Corrosion can well etc..Because having the above advantages, tungsten and tungsten alloy are widely used in medical treatment, electronic information, aerospace, army
The fields such as thing industry.But with the increasingly reinforcing of military, civilian fortification, increasingly higher demands are proposed to material property: not only
There is good comprehensive mechanical property, also to realize " multi-functional " property of material as far as possible.In order to cooperate modern science and technology to new metal
The demand direction of material improves tungsten alloy performance, promotes its adaptability under multi-environment, and expands the tungsten alloy scope of application
Equal research work are extremely urgent.
Summary of the invention
For the limitation of the prior art, one of the objects of the present invention is to provide a kind of multi-functional tungsten alloy gradient materials
Material.
The second object of the present invention is to provide a kind of preparation method of multi-functional tungsten alloy functionally gradient material (FGM).
A kind of multi-functional tungsten alloy functionally gradient material (FGM), according to from one end of the material to the direction of the other end, including two
Material segment, leading portion material are made of tungsten and metallic addition, and wherein tungsten weight percentage ranges are 93-98%；Back segment material by
Tungsten and metallic addition composition, wherein tungsten weight percentage ranges are 88-93%, and the W content of leading portion material is greater than back segment material
The W content of material.According to application demand, it is desirable that leading portion has higher-strength, and back segment has higher toughness.
Multi-functional tungsten alloy functionally gradient material (FGM) of the present invention is integrally formed, is matched wherein containing two kinds of different components
The material segment of ratio has a bound fraction between leading portion and back segment material, in use, leading portion and back segment material make
With direction depending on application environment.
In above-mentioned multi-functional tungsten alloy functionally gradient material (FGM), as a preferred implementation manner, in leading portion material and back segment material
In material, the metallic addition includes: nickel and iron, it is highly preferred that the metallic addition further includes cobalt and/or manganese, further
Preferably, the metallic addition further includes molybdenum；It is further preferred that in the leading portion material, by weight percentage, institute
The content for stating metallic addition is as follows: 1-5% nickel, 1-3% iron, 0-4% cobalt, 0-0.5% manganese；It is further preferred that cobalt is
0.5-3%, manganese 0.02-0.5%；In the back segment material, by weight percentage, the content of the metallic addition is such as
Under: 1-8% nickel, 1-3% iron, 0-4% cobalt, 0-0.5% manganese；It is further preferred that cobalt is 0.5-3%, manganese 0.02-0.5%.
It is as a preferred implementation manner, by weight percentage, described in above-mentioned multi-functional tungsten alloy functionally gradient material (FGM)
Leading portion material is made of following component: W 93%, Ni 5%, Fe 1%, Co 1%；The back segment material is by following component structure
At: W 90%, Ni 7%, Fe 2.5%, Co 0.5%；Alternatively, the leading portion material is made of following component: W 95%, Ni
2%, Fe 1%, Co 1.5%, Mn 0.5%；The back segment material is made of following component: W 93%, Ni 5%, Fe 1%,
Co 1%；Alternatively, the leading portion material is made of following component: W 97%, Ni 1%, Fe 0.5%, Co 1%, Mn
0.5%；The back segment material is made of following component: W 95%, Ni 2%, Fe 1.5%, Co 1.5%.
A kind of preparation method of multi-functional tungsten alloy functionally gradient material (FGM), comprising:
The preparation step of tungsten alloy powder: according in any one of the claim 1-4 multi-functional tungsten alloy functionally gradient material (FGM)
The ingredient and its weight ratio of leading portion material and back segment material weigh raw material, respectively by the raw material of the leading portion material and back segment material
Ball milling is carried out after mixing, is then sieved, and the tungsten alloy powder of leading portion material and the tungsten alloy powder of back segment material are obtained；
Compression moulding step: according to the design sequence of leading portion material and back segment material, by the tungsten alloy powder of leading portion material
It is sequentially loaded into mold with the tungsten alloy powder of back segment material, is then pressed, obtains green compact；
Sintering step: the green compact is sintered, and obtains tungsten alloy sintering briquette；
Heat treatment step: the tungsten alloy sintering briquette is heat-treated, tungsten alloy material is obtained.
In the above preparation method, the preparation method further includes machining steps as a preferred implementation manner, institute
State machining steps are as follows: the tungsten alloy material is machined out processing, obtains tungsten alloy end product part；
In the above preparation method, as a preferred implementation manner, in the ball milling step, the Fei Shi of the tungsten powder
Granularity is 2.0~4.0 μm (such as 2.2 μm, 2.5 μm, 3 μm, 3.5 μm, 3.8 μm), and the nickel powder is electrolytic nickel powder or carbonyl nickel
Powder, the iron powder are electrolytic iron powder or carbonyl iron dust, and the cobalt powder and manganese powder are regular industrial powder.
In the above preparation method, as a preferred implementation manner, in the ball milling step, the Ball-milling Time is
2~8 hours (such as 2h, 3h, 4h, 5h, 6h, 7h), the revolving speed of the ball milling be 100~500r/min (such as 120r/min,
150r/min, 200r/min, 250r/min, 300r/min, 350r/min, 400r/min, 450r/min), ratio of grinding media to material 2:1-
3:1；Preferably, the sieving was 80~140 meshes (such as 80 mesh, 100 mesh, 120 mesh, 140 mesh).
In the above preparation method, described to be pressed into as a preferred implementation manner, in the compression moulding step
Type is cold isostatic compaction, the pressure of the cold isostatic compaction be 180~250MPa (such as 185MPa, 200MPa,
220MPa, 235MPa, 245MPa), the dwell time is 5~15min (such as 6min, 8min, 10min, 13min, 14min).
In the above preparation method, described to be sintered in hydrogen as a preferred implementation manner, in the sintering step
Carried out in gas atmosphere, it is preferable that the temperature of the sintering be 1300~1550 DEG C (such as 1340 DEG C, 1360 DEG C, 1380 DEG C,
1405 DEG C, 1450 DEG C, 1485 DEG C, 1500 DEG C, 1520 DEG C, 1540 DEG C, 1545 DEG C), the time of the sintering is 0.5~4h (ratio
Such as 1h, 1.5h, 2h, 2.5h, 3h, 3.5h).
In the above preparation method, as a preferred implementation manner, in the heat treatment step, described be heat-treated is
It carries out under vacuum conditions, the temperature of the heat treatment be 905~1200 DEG C (such as 950 DEG C, 1000 DEG C, 1050 DEG C, 1100
DEG C, 1150 DEG C), time of the heat treatment is 1~8h (such as 1.5h, 2h, 2.5h, 3h, 4.5h, 5h, 6h, 7h, 7.5h).
The present invention makes full use of the performance characteristics of the tungsten alloy of existing different component by research and experiment, finds to not
The tungsten alloy material of same component, performance, the global facility for carrying out reasonable layout designs, preparing can significantly provide tungsten
The function adaptability of alloy.Such as in terms of national defence fortification, effectively improve that explosion fight the penetrating of component, effect is injured in explosion
Fruit.
Compared with prior art, the present invention has the advantages that are as follows:
One, tungsten alloy provided by the invention is the respective performance characteristics based on different component tungsten alloy, in rational design
On the basis of, different component material is effectively integrated, it is intended to provide All-in-One operational version for military and civilian's fortification actual demand.And it makes
Standby tungsten alloy material out, has good comprehensive mechanical property；
Two, preparation method of the invention carries out activation mixing to tungsten alloy raw material powder using high-energy ball milling method, with refinement
Powder particles increase specific grain surface product, make sintering process be easier to densify, not only reinforcing material sintering activity, improve material
Sintering character, and during the sintering process, more effectively guarantee to spread between variant component, strengthens joint face.
Three, raw material of the invention through product structure design, particular form charge, be made multistage and heterogeneity proportion it is whole
Root blank；Using firing, vacuum heat treatment, the techniques such as working hardening processing and ageing treatment.The present invention by reasonably at
Distribution ratio, structure design and preparation method, make the multi-functional tungsten alloy functionally gradient material (FGM) of the present invention have excellent, stable synthesis mechanics
Performance provides reference for the design and exploitation of new function armor-piercing bullet.
Detailed description of the invention
Fig. 1 is process flow chart of the invention.
Fig. 2 is the metallographic structure photo of the tungsten alloy material prepared using 1 preparation method of the embodiment of the present invention.
Specific embodiment
In order to make the content of the present invention more clearly understood, it below according to a specific embodiment of the invention and ties
Attached drawing is closed, the present invention is described in further detail.Described herein specific examples are only used to explain the present invention, not
For limiting the present invention.
The preparation flow of the multi-functional tungsten alloy functionally gradient material (FGM) of the present invention is referring to Fig. 1.
Embodiment 1
Step 1, the preparation of tungsten alloy powder
First component 93W5Ni1Fe1Co (respective digital is the mass percentage of each component in the alloy): it weighs respectively
3.5 μm of Fisher particle size of tungsten powder 930g, carbonyl nickel powder 50g, electrolytic iron powder 10g, cobalt powder 10g are packed into high energy ball mill after mixing
In, sintered carbide ball 2Kg is added, ball milling 4h under the conditions of revolving speed is 120r/min, the 1000g for obtaining being mixed with micro cobalt element is closed
Bronze end, then crosses 120 meshes, and use minus sieve as first group of powder.
Second component 90W7Ni2.5Fe0.5Co (respective digital is the mass percentage of each component in the alloy): respectively
3.5 μm of Fisher particle size of tungsten powder 900g, carbonyl nickel powder 70g, electrolytic iron powder 25g are weighed, cobalt powder 5g is packed into high-energy ball milling after mixing
In machine, sintered carbide ball 2Kg is added, ball milling 4h under the conditions of revolving speed is 120r/min obtains the 1000g for being mixed with micro cobalt element
Then tungsten alloy powder crosses 90 meshes, and uses minus sieve as second group of powder.
Step 2, cold isostatic compaction
First group of powder is fully enclosed in mold, ram-jolt, then is packed into second group of whole powders into mold, then will
The mold for filling raw material is placed into oil cylinder, and pressure maintaining 10min obtains the molding green compact that relative density is 65% under 180MPa pressure,
Green compact is formed having a size of 26 × 353mm of φ.
Step 3, sintering processes
Molding green compact in above-mentioned steps two is put into hydrogen sintering furnace and is sintered, sintering maximum temperature is
1485 DEG C, highest temperature soaking time is 1h, obtains sintering briquette, density 17.62g/cm3, having a size of 23 × 301mm of φ.
Step 4 is heat-treated after sintering
Sintering briquette in step 3 is put into vacuum sintering furnace and carries out vacuum heat treatment, temperature is 1100 DEG C, and heat preservation 3 is small
When, obtain tungsten alloy bar.
Step 5, machining
Tungsten alloy bar in step 4 is machined out, the tungsten alloy end product part for meeting actual demand is obtained.
Gained tungsten alloy end product part is tested according to GB/T228.1-2010, results of property such as the following table 1 is (wherein,
Interlude is the part that leading portion and back segment combine)；According to application demand, leading portion uses the higher 93W5Ni1Fe1Co of tensile strength
Material guarantees enough intensity but elongation percentage is relatively low, and back segment uses 90W7Ni2.5Fe0.5Co, has preferable ductility, prolongs
Stretch that rate is higher and leading portion intensity decreases, being located in the middle bound fraction also has ideal performance, this kind of material can
To effectively improve explosion fight the penetrating of component, explosion damage effectiveness.
1 embodiment of table each section of performance of 1 tungsten alloy product
Embodiment 2
Step 1, the preparation of tungsten alloy powder
First component 95W2Ni1Fe1.5Co0.5Mn (respective digital is the mass percentage of each component in the alloy):
3.5 μm of Fisher particle size of tungsten powder 950g, carbonyl nickel powder 20g, electrolytic iron powder 10g, cobalt powder 15g, manganese powder 5g, after mixing are weighed respectively
It is fitted into high energy ball mill, sintered carbide ball 2Kg is added, ball milling 4h under the conditions of revolving speed is 120r/min obtains being mixed with micro
The 1000g tungsten alloy powder of cobalt, manganese element, then sieves with 100 mesh sieve, and uses minus sieve as first group of powder.
Second component 93W5Ni1Fe1Co (respective digital is the mass percentage of each component in the alloy): it weighs respectively
3.2 μm of Fisher particle size of tungsten powder 930g, electrolytic nickel powder 50g, carbonyl iron dust 10g, cobalt powder 10g are packed into high energy ball mill after mixing
In, sintered carbide ball 2Kg is added, ball milling 4h under the conditions of revolving speed is 120r/min, the 1000g for obtaining being mixed with micro cobalt element is closed
Bronze end, then sieves with 100 mesh sieve, and use minus sieve as second group of powder.
Step 2, cold isostatic compaction
First group of powder is fitted into mold, ram-jolt, then is packed into second group of powder into mold, then will fill raw material
Mold is placed into oil cylinder, and pressure maintaining 10min obtains the molding green compact that relative density is 63% under 180MPa pressure, forms green compact ruler
Very little is 25 × 351mm of φ.
Step 3, sintering processes
Molding green compact in above-mentioned steps two is put into hydrogen sintering furnace and is sintered, sintering maximum temperature is
1485 DEG C, highest temperature soaking time is 1h, obtains sintering briquette, density 17.62g/cm3, having a size of φ 23 × 301.
Step 4 is heat-treated after sintering
Sintering briquette in step 3 is put into vacuum sintering furnace and carries out vacuum heat treatment, temperature is 1100 DEG C, and heat preservation 3 is small
When, obtain tungsten alloy bar.
Step 5, machining
Tungsten alloy bar in step 4 is machined out, the tungsten alloy end product part for meeting actual demand is obtained.
Gained tungsten alloy end product part is tested according to GB/T228.1-2010, results of property such as the following table 2 is (wherein,
Interlude is the part that leading portion and back segment combine)；According to application demand, leading portion is higher using tensile strength
95W2Ni1Fe1.5Co0.5Mn material guarantees enough intensity and the relatively low brittleness of elongation percentage is strong, and back segment uses
93W5Ni1Fe1Co, compared with 95W2Ni1Fe1.5Co0.5Mn, 93W5Ni1Fe1Co has preferable toughness, shows higher
Elongation percentage and its leading portion intensity decreases, being located in the middle bound fraction also has ideal performance, this kind of material
It can effectively improve explosion fight the penetrating of component, explosion damage effectiveness.
2 embodiment of table each section of performance of 2 tungsten alloy product
Embodiment 3
Step 1, the preparation of tungsten alloy powder
First component 97W1Ni0.5Fe1Co0.5Mn (respective digital is the mass percentage of each component in the alloy):
3.0 μm of Fisher particle size of tungsten powder 970g, carbonyl nickel powder 10g, electrolytic iron powder 5g, cobalt powder 10g, manganese powder 5g, after mixing are weighed respectively
It is fitted into high energy ball mill, sintered carbide ball 2Kg is added, ball milling 2h under the conditions of revolving speed is 150r/min obtains being mixed with micro
Then the 1000g tungsten alloy powder of cobalt, manganese element crosses 140 meshes, obtains first group of powder.
Second component 95W2Ni1.5Fe1.5Co (respective digital is the mass percentage of each component in the alloy): respectively
3.0 μm of Fisher particle size of tungsten powder 950g, carbonyl nickel powder 20g, electrolytic iron powder 15g, cobalt powder 15g are weighed, high energy ball is packed into after mixing
In grinding machine, sintered carbide ball 2Kg is added, ball milling 2h under the conditions of revolving speed is 150r/min obtains being mixed with micro cobalt element
1000g alloy powder, then crosses 120 meshes, and extracting screen underflow obtains second group of powder.
Step 2, cold isostatic compaction
First group of powder is fitted into mold, ram-jolt, then is packed into second group of powder into mold, then will fill raw material
Mold is placed into oil cylinder, and pressure maintaining 10min obtains the molding green compact that relative density is 64% under 180MPa pressure, forms green compact ruler
Very little is 26 × 354mm of φ.
Step 3, sintering processes
Molding green compact in above-mentioned steps two is put into hydrogen sintering furnace and is sintered, sintering maximum temperature is
1550 DEG C, highest temperature soaking time is 1h, obtains sintering briquette, density 18.23g/cm3, having a size of φ 22 × 298.
Step 4 is heat-treated after sintering
Sintering briquette in step 3 is put into vacuum sintering furnace and carries out vacuum heat treatment, temperature is 1150 DEG C, and heat preservation 4 is small
When, obtain tungsten alloy material.
Step 5, machining
Tungsten alloy material in step 4 is machined out, the tungsten alloy end product part for meeting actual demand is obtained.
Gained tungsten alloy end product part is tested according to GB/T228.1-2010, results of property such as the following table 3 is (wherein,
Interlude is the part that leading portion and back segment combine)；Leading portion is higher using tensile strength but elongation percentage is lower
97W1Ni0.5Fe1Co0.5Mn belonging to fragile material, meet the actual operation requirements requirement frangible to material leading portion, back segment
Using 95W2Ni1.5Fe1.5Co, meet the requirement to the preferable toughness of back segment.Being located in the middle bound fraction also has non-convention
The performance thought, this kind of material can effectively improve explosion fight the penetrating of component, explosion damage effectiveness.
3 embodiment of table each section of performance of 3 tungsten alloy product
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes still within the protection scope of the invention.
Claims (10)
1. a kind of multi-functional tungsten alloy functionally gradient material (FGM), which is characterized in that according to from one end of the material to the direction of the other end,
Including two material segments, leading portion material is made of tungsten and metallic addition, and wherein tungsten weight percentage ranges are 93-98%；Afterwards
Section material is made of tungsten and metallic addition, and wherein tungsten weight percentage ranges are 88-93%, and the W content of leading portion material is big
In the W content of back segment material.
2. multi-functional tungsten alloy functionally gradient material (FGM) according to claim 1, which is characterized in that in leading portion material and back segment material
In, the metallic addition includes: nickel and iron, it is preferable that the metallic addition further includes cobalt and/or manganese, it is highly preferred that institute
Stating metallic addition further includes molybdenum.
3. multi-functional tungsten alloy functionally gradient material (FGM) according to claim 2, which is characterized in that in the leading portion material, press
The content of weight percent meter, the metallic addition is as follows: 1-5% nickel, 1-3% iron, 0-4% cobalt, 0-0.5% manganese；It is preferred that
Ground, cobalt 0.5-3%, manganese 0.02-0.5%；
In the back segment material, by weight percentage, the content of the metallic addition is as follows: 1-8% nickel, 1-3% iron,
0-4% cobalt, 0-0.5% manganese；Preferably, cobalt 0.5-3%, manganese 0.02-0.5%.
4. multi-functional tungsten alloy functionally gradient material (FGM) according to claim 3, which is characterized in that
By weight percentage, the leading portion material is made of following component: W 93%, Ni 5%, Fe 1%, Co1%；It is described
Back segment material is made of following component: W 90%, Ni 7%, Fe 2.5%, Co 0.5%；Alternatively, the leading portion material is by such as
Lower component is constituted: W 95%, Ni 2%, Fe 1%, Co 1.5%, Mn 0.5%；The back segment material is made of following component:
W 93%, Ni 5%, Fe 1%, Co 1%；Alternatively, the leading portion material is made of following component: W 97%, Ni 1%, Fe
0.5%, Co 1%, Mn 0.5%；The back segment material is made of following component: W 95%, Ni 2%, Fe 1.5%, Co
1.5%.
5. a kind of preparation method of multi-functional tungsten alloy functionally gradient material (FGM) characterized by comprising
The preparation step of tungsten alloy powder: according to leading portion in any one of the claim 1-4 multi-functional tungsten alloy functionally gradient material (FGM)
The ingredient and its weight ratio of material and back segment material weigh raw material, respectively mix the raw material of the leading portion material and back segment material
After carry out ball milling, be then sieved, obtain the tungsten alloy powder of leading portion material and the tungsten alloy powder of back segment material；
Compression moulding step: according to the design sequence of leading portion material and back segment material, by the tungsten alloy powder of leading portion material with after
The tungsten alloy powder of section material is sequentially loaded into mold, is then pressed, is obtained green compact；
Sintering step: the green compact is sintered, and obtains tungsten alloy sintering briquette；
Heat treatment step: the tungsten alloy sintering briquette is heat-treated, tungsten alloy material is obtained.
6. the preparation method of multi-functional tungsten alloy functionally gradient material (FGM) according to claim 5, which is characterized in that the preparation side
Method further includes machining steps, the machining steps are as follows: the tungsten alloy material is machined out processing, obtains tungsten alloy
Whole product part.
7. the preparation method of multi-functional tungsten alloy functionally gradient material (FGM) according to claim 5, which is characterized in that in the ball milling
In step, the Fisher particle size of the tungsten powder is 2.0~4.0 μm, and the nickel powder is electrolytic nickel powder or carbonyl nickel powder, and the iron powder is
Electrolytic iron powder or carbonyl iron dust；Preferably, the Ball-milling Time is 2~8 hours, and the revolving speed of the ball milling is 100~500r/
Min, ratio of grinding media to material 2:1-3:1；Preferably, the sieving was 80~140 meshes.
8. the preparation method of multi-functional tungsten alloy functionally gradient material (FGM) according to claim 5, which is characterized in that in the compacting
In forming step, the compression moulding is cold isostatic compaction, and the pressure of the cold isostatic compaction is 180~250MPa, is protected
The pressure time is 5~15min.
9. the preparation method of multi-functional tungsten alloy functionally gradient material (FGM) according to claim 5, which is characterized in that in the sintering
In step, described be sintered to carries out in hydrogen atmosphere, it is preferable that the temperature of the sintering is 1300~1550 DEG C, the burning
The time of knot is 0.5~4h.
10. the preparation method of multi-functional tungsten alloy functionally gradient material (FGM) according to claim 5, which is characterized in that in the heat
In processing step, the heat treatment is carries out under vacuum conditions, and the temperature of the heat treatment is 905~1200 DEG C, the heat
The time of processing is 1~8h.
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| CN111155018A (en) * | 2020-01-21 | 2020-05-15 | 安泰天龙钨钼科技有限公司 | Preparation method of molybdenum-rhenium alloy gradient material |
| CN112458329A (en) * | 2020-11-27 | 2021-03-09 | 西安华山钨制品有限公司 | Method for preparing tungsten alloy with different components by sintering in same furnace |
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