CN109570519A - A kind of preparation method of the CoCrMo alloy powder for 3D printing - Google Patents
A kind of preparation method of the CoCrMo alloy powder for 3D printing Download PDFInfo
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- CN109570519A CN109570519A CN201910099068.2A CN201910099068A CN109570519A CN 109570519 A CN109570519 A CN 109570519A CN 201910099068 A CN201910099068 A CN 201910099068A CN 109570519 A CN109570519 A CN 109570519A
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
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- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y70/00—Materials specially adapted for additive manufacturing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C19/00—Alloys based on nickel or cobalt
- C22C19/07—Alloys based on nickel or cobalt based on cobalt
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
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- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/088—Fluid nozzles, e.g. angle, distance
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0896—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid particle transport, separation: process and apparatus
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Abstract
The present invention relates to a kind of preparation methods of CoCrMo alloy powder for 3D printing, this method uses process for vacuum induction smelting and Close-Coupled Gas Atomization technology, applying vibration screening, air current classifying method carry out grain size proportion to powder, and the CoCrMo alloy powder suitable for selective laser smelting technology is prepared.Compared with prior art, the performance characteristics such as CoCrMo alloy powder prepared by the present invention has sphericity height, even particle size distribution, oxygen content is low, impurity content is low, selective laser smelting technology is met to the performance requirement of dusty material, promotes the development of metal increases material manufacturing technology.
Description
Technical field
The present invention relates to a kind of preparation methods of metal powder, more particularly, to a kind of CoCrMo alloy for 3D printing
The preparation method of powder, belongs to material increasing field.
Background technique
3D printing is a kind of using means such as laser or electron beams, and foundation three-dimensional modeling successively adds under the control of the computer
Add accumulation material that the manufacturing technology of part is directly quickly precisely formed, also referred to as " increasing material manufacturing ".Increases material manufacturing technology does not need to pass
Cutter, fixture and the multi-step process of system can be produced rapidly and precisely on one device using three-dimensional design data
The part of arbitrarily complicated shape, traditional processing and common special processing technology compared to material removal (or deformation), increases material
Manufacturing technology has high stock utilization.
Selective laser smelting technology (Selective Laser Melting, SLM) is one kind of metal parts straight forming
Method is the latest development of metal increases material manufacturing technology.Most basic thought of the technology based on rapid shaping, i.e., layer-by-layer cladding
" increment " manufacture has the part of geometry in particular, metal powder in forming process according to threedimensional model straight forming
It is completely melt, generates metallurgical bonding.SLM can produce the shape and structure that can not be manufactured using traditional machining means
Complicated metal parts, and manufacturing procedure is greatly reduced, shorten the process-cycle.It is currently used in the metal powder material of SLM
There are titanium alloy, aluminium alloy, stainless steel, mould steel, nickel-base alloy, cochrome etc..
Vacuum induction melting (Vacuuminduction melting, abbreviation VIM) is a kind of under vacuum conditions using electric
Magnetic induction principle of heating carrys out the smithcraft processing procedure of smelting metal.Eddy current can be generated during electromagnetic induction, keep metal molten
Change.This processing procedure can be used to improve the purity of alloy, the low-alloyed oxygen content of drop.
Vitallium (CoCrMo) is one of cobalt-base alloys, and the Si Taili (Stellite) being also known as is closed
One kind of gold.CoCrMo alloy has good mechanical performance and physicochemical property, as one of common cobalt-based material, molding
Ability is prominent.The CoCrMo alloy prosthesis of casting can be used as metal ball-head and carry out with ultra-high molecular weight polyethylene with pair, composition
Artificial hip prosthesis etc. can also be shaped to alone metal implant.According to the requirement of ASTMF75 standard, CoCrMo is cast
Alloy is widely used for the medical domains such as dentistry, implant.However the processing hand complicated, traditional due to implant planform
Section can not meet the needs of patient in a short time, and use 3D printing technique, can effectively overcome disadvantages mentioned above.
The mainly gas atomization and plasma rotating electrode process etc. of alloy powder preparation method at present.The base of gas atomization
Present principles are that flow of liquid metal is broken into droplet and is quickly solidified with high-speed flow to form powder；Plasma rotating electrode process
Cardinal principle be that will make alloy bar that local melting occur using plasma arc, while alloy electrode is in inert gas high speed
Rotation, molten metal forms alloy powder under the action of the centrifugal force.The two is compared, and the obtained powder size of atomization is thinner, but
It is that traditional atomization process easily causes powder to be mingled with content height, satellite ball, hollow spherical powder；The powder of plasma rotating electrode process preparation
End, sphericity is high, and degree of purity is high, but powder size is thicker, is not suitable for 3D printing technique, therefore, using novel atomized skill
A series of art, comprehensive powder-processed techniques, it is most important to provide a kind of method for preparing 3D printing alloy powder.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of for 3D printing
The preparation method of CoCrMo alloy powder.
The present invention uses process for vacuum induction smelting and Close-Coupled Gas Atomization technology, vibrated with ultrasonic vibration, bounder,
Air current classifying method matches varigrained powder, and the CoCrMo alloy powder finally prepared has ingredient uniform, miscellaneous
Matter content is low, the performance characteristics such as sphericity height, even particle size distribution, can be good at being suitable for selective laser smelting technology.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of preparation method of the CoCrMo alloy powder for 3D printing, comprising the following steps:
(1) alloy melting: vacuum induction melting is carried out to CoCrMo alloy raw material, obtains alloy melt；
(2) powder by atomization: alloy melt is poured into intermediate bottom pour ladle, opens material leakage valve, alloy melt is through intermediate bottom pour ladle bottom
Leak hole freely flow downwardly into gas atomization furnace, under the percussion of supersonic airstream, alloy melt is ground into fine droplets,
CoCrMo alloy powder is obtained after cooling, solidification, powder drops to atomization tower bottom, is brought into the powder under cyclone by gas later
Last collection device；
(3) CoCrMo alloy powder made from step (2) powder sieving: is subjected to vibrosieve；Then to vibrosieve
Obtained powder carries out air current classifying, and the CoCrMo alloy powder for 3D printing technique is finally made.
In a more excellent embodiment of the invention, in step (1), carry out controlling vaccum sensitive stove when vacuum induction melting
Interior vacuum degree is < 1 × 10-2Pa.3D printing alloy powder has strict requirements to oxygen content, and high vacuum advantageously reduces
The oxygen content of powder.
In a more excellent embodiment of the invention, in step (1), it is completely melt to obtain alloy to CoCrMo alloy raw material
After melt, continue to heat, so that aluminium alloy temperature is reached 1600~1650 DEG C, and keep the temperature 15~20min.
In step (1), CoCrMo alloy raw material ingredient meets following requirement: Co: surplus by percentage to the quality, Cr:
26.5%~30.0%, Mo:4.5%~7.0%, Ni≤1.0%, Fe≤1.0%, C≤0.35%, Si≤1.0%, Mn≤
1.0%.
In a more excellent embodiment of the invention, in step (2), temperature control is 1150~1200 in intermediate bottom pour ladle
℃.It should be noted that bottom pour ladle temperature has large effect for atomization process, and when bottom pour ladle temperature is too low, aluminium alloy heat dissipation
Excessive velocities easily condense in bottom pour ladle, and be easy to cause blocking of leting slip a remark；Therefore it under the permission of appointed condition, should mention as far as possible
The temperature of bottom pour ladle between senior middle school.Meanwhile the application innovatively devises heating system of leting slip a remark, and is passed using graphite to leting slip a remark
Heat, and temperature is controlled at 1200-1300 DEG C, it further reduced the probability for blocking of leting slip a remark.
In a more excellent embodiment of the invention, in step (2), supersonic airstream is to spray disk by Lavalle formula to provide
, inert gas is high-purity argon gas or high pure nitrogen, and the atomizing pressure in gas atomization furnace is 2.0~3.5MPa.It is usually used
Atomization gas be subsonic speed, the application sprays disk using Lavalle formula, air velocity can be promoted to supersonic speed, effectively improves thin
Powder recovery rate reduces gas pressure, saves atomization cost.
In a more excellent embodiment of the invention, in step (3), vibrosieve is sieved using bounder.Tradition screening
In, it is usually all individually to be sieved using ultrasonic wave or bounder.Through testing, it has been found that for thicker powder, surpass
Sound wave can efficiently separate large or fine granule, reduce the ratio that fine grained is taken away by coarse granule, improve screening efficiency；For relatively thin but
The high amplitude of the preferable powder of mobility, bounder vibration can reduce sieve by the probability of particles plug, improve the mistake of powder
Net rate.The CoCrMo powder of the application preparation is thinner, therefore bounder is used to sieve, and can effectively improve production efficiency.
In a more excellent embodiment of the invention, in step (3), sieve mesh number is 300 mesh.It is sent out through a large amount of sieve tests
Existing, 53 μm of corresponding 270 mesh screens can not effectively remove 53 μm or more of powder, and remove 15 μm or less powder by air current classifying
Last, the accounting of 53 μm or more powder can further increase, and be unable to satisfy the requirement of selective laser smelting technology, and 300 mesh
Sieve then can be effectively controlled the accounting of 53 μm or more powder.
In a more excellent embodiment of the invention, in step (3), the grain size proportion of air current classifying are as follows: according to partial size 3~
15 μm of powder accounting 0~3%, 15~53 μm of partial size of powder accounting 87%~95%, 53~100 μm of partial size of powder accounting
5%~10% mass ratio relationship is matched.
The CoCrMo alloy powder for selective laser smelting technology of prior art preparation only simply sieves powder
Point, SLM molding equipment is directly used in after obtaining the suitable powder of particle size range.The application has found by experimental study: same grain
The powder of diameter range, different grain size proportion, laser fusing formability differ greatly.Co-based alloy powder prepared by the present invention,
Its average grain diameter is less than powdering stack layer thickness, is accurately matched by weight to the powder of different grain size rank, guarantees powdering
During selective laser is melted and shaped phenomenon of " splashing ", forming part deformation do not occur for the powder bed for forming high-compactness afterwards
It is small, precision is high, performance can satisfy requirement.
The present invention is directed to selective laser smelting technology feature, and in conjunction with different powder technologies of preparing, the CoCrMo of preparation is closed
Bronze end degree of purity is high, impurity and oxygen content are low, particle sphericity is high, particle diameter distribution is uniform, different-grain diameter rank powder is matched
It is more appropriate than relationship, there is good mobility and higher apparent density, meet selective laser smelting technology for powder property
Particular/special requirement.
In conclusion compared with prior art, the present invention has the following advantages and beneficial effects:
1, CoCrMo alloy powder impurity content prepared by the present invention is low, and particle diameter distribution is uniform, and powder particle sphericity is high,
Average spherical degree >=0.90, powder flowbility is good (≤18s/50g), apparent density height (>=4.5g/cm3), it is obtained by 3D printing
The drip molding even tissue that arrives, densification, dimensional accuracy is high, good mechanical performance.
2, the present invention is directed to requirement of the different metal 3D printing technique to powder diameter, passes through vibrosieve, air current classifying
The methods of, preparation is suitable for the CoCrMo alloy powder of a variety of 3D printing techniques.
Detailed description of the invention
Fig. 1 is CoCrMo alloy powder particle shape appearance figure made from the embodiment of the present invention 1；
Fig. 2 is CoCrMo alloy powder particle shape appearance figure made from the embodiment of the present invention 2.
Specific embodiment
A kind of preparation method of the CoCrMo alloy powder for 3D printing, comprising the following steps:
(1) alloy melting: vacuum induction melting is carried out to CoCrMo alloy raw material, obtains alloy melt；
(2) powder by atomization: alloy melt is poured into intermediate bottom pour ladle, opens material leakage valve, alloy melt is through intermediate bottom pour ladle bottom
Leak hole freely flow downwardly into gas atomization furnace, under the percussion of supersonic airstream, alloy melt is ground into fine droplets,
CoCrMo alloy powder is obtained after cooling, solidification, powder drops to atomization tower bottom, is brought into the powder under cyclone by gas later
Last collection device；
(3) CoCrMo alloy powder made from step (2) powder sieving: is subjected to bounder vibrosieve；Then to vibration
The dynamic obtained powder that sieves carries out air current classifying；
In step (1), vacuum degree is < 1 × 10 in control vaccum sensitive stove when carrying out vacuum induction melting-2Pa, to
CoCrMo alloy raw material is completely melt after obtaining alloy melt, continues to heat, and aluminium alloy temperature is made to reach 1550~1600 DEG C, and
Keep the temperature 15~20min.
In step (1), CoCrMo alloy raw material ingredient meets following requirement: Co: surplus by percentage to the quality, Cr:
26.5%~30.0%, Mo:4.5%~7.0%, Ni≤1.0%, Fe≤1.0%, C≤0.35%, Si≤1.0%, Mn≤
1.0%.
In step (2), at 1150~1200 DEG C, supersonic airstream is sprayed by Lavalle formula for temperature control in intermediate bottom pour ladle
What disk provided, inert gas is high-purity argon gas or high pure nitrogen, and the atomizing pressure in gas atomization furnace is 2.0~3.5MPa.Separately
The blocking of leting slip a remark of intermediate bottom pour ladle in order to prevent outside, it is of the invention in position of leting slip a remark is heated using graphite, it is good to solve
It lets slip a remark clogging.
In step (3), the sieve mesh number of ultrasonic vibration screening is 300 mesh, in step (3), the grain size proportion of air current classifying
Are as follows: according to 3~15 μm of partial size of powder accounting 0~3%, 15~53 μm of partial size of powder accounting 87%~95%, partial size 53~
The mass ratio relationship of 100 μm of powder accounting 5%~10% is matched.
The present invention is described in detail combined with specific embodiments below.
Embodiment 1:
The present embodiment is used for SLM technology using following steps preparation mainly for the alloy former material of secondary smelting
CoCrMo alloy powder:
(1) vacuum induction melting, alloying component Co: remaining alloy remelting: is added in the CoCrMo alloy raw material of 50kg
Amount, Cr:27.8%, Mo:6.2%, Ni≤0.1%, Fe≤0.01%, C≤0.02%, Si≤0.5%, Mn≤0.2%.Melting
Furnace vacuum degree 7.8 × 10-3Pa, after raw material is completely melt, molten steel temperature is controlled at 1630 DEG C, keeps the temperature 20min, while centre being leaked
Packet is heated to 1180 DEG C；
(2) powder by atomization: opening material leakage valve, and alloy melt freely flows downwardly into gas mist through the leak hole of intermediate bottom pour ladle bottom
Change furnace, the atomizing pressure in gas atomization furnace is 2.0MPa, and under the percussion of High Purity Nitrogen air-flow, alloy melt is ground into micro-
Small droplet obtains CoCrMo alloy powder after cooling, solidification, and powder drops to atomizing cooling tower bottom, brings powder by gas
Collection device；
(3) CoCrMo alloy powder made from step (2) powder sieving: is subjected to vibrosieve, sieve mesh number 300
Mesh takes the lower mesh of sieve, and it is 4.2% that 53 μm or more powder, which account for,；Then air current classifying is carried out to the powder that vibrosieve obtains, according to grain
3~15 μm of diameter of powder accounting 1.5%, 15~53 μm of partial size of powder accounting 93.6%, 53~100 μm of partial size of powder accounting
4.9% mass ratio relationship is matched.
CoCrMo alloy powder particle pattern that the present embodiment is prepared is as shown in Figure 1,38.45 μm of average grain diameter, ball
Shape degree 0.93, mobility 16.6s/50g, apparent density 4.72g/cm3, powder carried out in EOS M290 equipment part SLM at
Type, powder flowbility is good during powdering, and formation of parts deforms small, uniform texture, and mechanical property meets the use of part
It is required that.
Embodiment 2
The CoCrMo alloy powder of SLM technology is used for using following steps preparation:
(1) vacuum induction melting, alloying component Co: remaining alloy melting: is added in the CoCrMo alloy raw material of 50kg
Amount, Cr:28.8%, Mo:6.1%, Ni≤0.2%, Fe≤0.03%, C≤0.02%, Si≤0.1%, Mn≤0.2%.Melting
Furnace vacuum degree 9.1 × 10-3Pa, after raw material is completely melt, aluminium alloy temperature is controlled at 1640 DEG C, keeps the temperature 20min, while will be intermediate
Bottom pour ladle is heated to 1170 DEG C；
(2) powder by atomization: alloy melt is poured into intermediate bottom pour ladle, opens material leakage valve, alloy melt is through intermediate bottom pour ladle bottom
Leak hole freely flow downwardly into gas atomization furnace, the atomizing pressure in gas atomization furnace be 3.0MPa, in rushing for High Purity Nitrogen air-flow
It hits under effect, alloy melt is ground into fine droplets, obtains CoCrMo alloy powder after cooling, solidification, powder drops to atomization
Cooling tower bottom, brings powder collection device by gas；
(3) CoCrMo alloy powder made from step (2) powder sieving: is subjected to ultrasonic vibration screening, sieve mesh number
For 300 mesh, the lower mesh of sieve is taken, 53 μm or more powder accountings are 3.5%；Then air-flow point is carried out to the powder that vibrosieve obtains
Grade, according to 3~15 μm of partial size of powder accounting 2.2%, 15~53 μm of partial size of powder accounting 93%, 53~100 μm of partial size
The mass ratio relationship of powder accounting 4.8% is matched.
CoCrMo alloy powder particle pattern that the present embodiment is prepared is as shown in Fig. 2, 36.24 μm of average grain diameter, ball
Shape degree 0.94, mobility 17.5s/50g, apparent density 4.71g/cm3, powder carried out in EOS M290 equipment part SLM at
Type, powder flowbility is good during powdering, and formation of parts deforms small, uniform texture, and mechanical property meets the use of part
It is required that.
The above description of the embodiments is intended to facilitate ordinary skill in the art to understand and use the invention.
Person skilled in the art obviously easily can make various modifications to these embodiments, and described herein general
Principle is applied in other embodiments without having to go through creative labor.Therefore, the present invention is not limited to the above embodiments, ability
Field technique personnel announcement according to the present invention, improvement and modification made without departing from the scope of the present invention all should be of the invention
Within protection scope.
Claims (10)
1. a kind of preparation method of the CoCrMo alloy powder for 3D printing, which comprises the following steps:
(1) alloy melting: vacuum induction melting is carried out to CoCrMo alloy raw material, obtains alloy melt；
(2) powder by atomization: alloy melt is poured into intermediate bottom pour ladle, leak hole of the alloy melt through intermediate bottom pour ladle bottom is freely to dirty
Enter gas atomization furnace, under the percussion of supersonic airstream, alloy melt is ground into fine droplets, obtains after cooling, solidification
CoCrMo alloy powder；
(3) CoCrMo alloy powder made from step (2) powder sieving: is subjected to vibrosieve；Then vibrosieve is obtained
Powder carry out air current classifying, the CoCrMo alloy powder for 3D printing is finally made.
2. a kind of preparation method of CoCrMo alloy powder for 3D printing according to claim 1, which is characterized in that
In step (1), vacuum degree is < 1 × 10 in control vaccum sensitive stove when carrying out vacuum induction melting-2Pa。
3. a kind of preparation method of CoCrMo alloy powder for 3D printing according to claim 1, which is characterized in that
In step (1), after CoCrMo alloy raw material is completely melt to obtain alloy melt, continues to heat, reach aluminium alloy temperature
1600~1650 DEG C, and keep the temperature 15~20min.
4. a kind of preparation method of CoCrMo alloy powder for 3D printing according to claim 1, which is characterized in that
In step (1), CoCrMo alloy raw material ingredient meets following requirement: Cr:26.5%~30.0%, Mo by percentage to the quality:
4.5%~7.0%, Ni≤1.0%, Fe≤1.0%, C≤0.35%, Si≤1.0%, Mn≤1.0%, Co: surplus.
5. a kind of preparation method of CoCrMo alloy powder for 3D printing according to claim 1, which is characterized in that
In step (2), temperature control is at 1150~1200 DEG C in intermediate bottom pour ladle.
6. a kind of preparation method of CoCrMo alloy powder for 3D printing according to claim 5, which is characterized in that
Intermediate leting slip a remark for bottom pour ladle bottom is heated, temperature is controlled at 1200-1300 DEG C.
7. a kind of preparation method of CoCrMo alloy powder for 3D printing according to claim 1, which is characterized in that
In step (2), supersonic airstream is to spray disk by Lavalle formula to provide, and the inert gas used is high-purity argon gas or High Purity Nitrogen
Gas, the atomizing pressure in gas atomization furnace are 2.0~3.5MPa.
8. a kind of preparation method of CoCrMo alloy powder for 3D printing according to claim 1, which is characterized in that
In step (3), vibrosieve is vibrated using bounder, and sieve mesh number is 300 mesh, surpasses 53 μm of alloy powder or more accountings not
Cross 5%.
9. a kind of preparation method of CoCrMo alloy powder for 3D printing according to claim 1, which is characterized in that
In step (3), the grain size proportion of air current classifying are as follows: 3~15 μm of partial size of powder 0~3wt% of accounting, the powder that 15~53 μm of partial size
The mass ratio relationship of last 87~95wt% of accounting, 53~100 μm of partial size of 5~10wt% of powder accounting are matched.
10. a kind of preparation method of CoCrMo alloy powder for 3D printing according to claim 6, feature exist
In described to let slip a remark equipped with heating device.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110666181A (en) * | 2019-09-29 | 2020-01-10 | 中南大学 | Preparation method of cobalt-chromium-molybdenum alloy spherical powder |
| CN110899711A (en) * | 2019-10-30 | 2020-03-24 | 临沂迈得新材料有限公司 | Zr-containing dental repair 3D printing cobalt-chromium-nickel alloy powder and preparation method thereof |
| CN111014706A (en) * | 2019-10-31 | 2020-04-17 | 西安欧中材料科技有限公司 | Cobalt-chromium-tungsten-molybdenum alloy powder for biomedical 3D printing and preparation method thereof |
| CN111197130A (en) * | 2019-12-20 | 2020-05-26 | 南通金源智能技术有限公司 | 3D printing metal powder for dental activity restoration and preparation method thereof |
| CN111992728A (en) * | 2020-08-23 | 2020-11-27 | 苏州超弦新材料有限公司 | Preparation method of spherical metal powder for additive manufacturing |
| CN112626376A (en) * | 2019-09-23 | 2021-04-09 | 圆融金属粉末股份有限公司 | Aluminum alloy powder and method for producing same, aluminum alloy product and method for producing same |
| CN114570933A (en) * | 2020-11-30 | 2022-06-03 | 中国科学院金属研究所 | Preparation method of high-molybdenum high-silicon cobalt-based hot spraying alloy powder |
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| CN111992728A (en) * | 2020-08-23 | 2020-11-27 | 苏州超弦新材料有限公司 | Preparation method of spherical metal powder for additive manufacturing |
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