CN114247894A - Method for preparing large-particle-size spherical tungsten powder by radio frequency plasma method - Google Patents
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- CN114247894A CN114247894A CN202011022797.7A CN202011022797A CN114247894A CN 114247894 A CN114247894 A CN 114247894A CN 202011022797 A CN202011022797 A CN 202011022797A CN 114247894 A CN114247894 A CN 114247894A
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- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 title claims abstract description 153
- 238000000034 method Methods 0.000 title claims abstract description 77
- 239000002245 particle Substances 0.000 claims abstract description 128
- 239000002243 precursor Substances 0.000 claims abstract description 62
- 238000007873 sieving Methods 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims description 31
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 28
- 239000000843 powder Substances 0.000 claims description 26
- 229910052786 argon Inorganic materials 0.000 claims description 14
- 238000001035 drying Methods 0.000 claims description 14
- 239000012159 carrier gas Substances 0.000 claims description 12
- 238000009694 cold isostatic pressing Methods 0.000 claims description 7
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 6
- 238000010981 drying operation Methods 0.000 claims description 5
- 238000009792 diffusion process Methods 0.000 description 4
- 238000000635 electron micrograph Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 3
- 238000007751 thermal spraying Methods 0.000 description 3
- 229910052721 tungsten Inorganic materials 0.000 description 3
- 239000010937 tungsten Substances 0.000 description 3
- 238000010146 3D printing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002105 nanoparticle Substances 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 229910001080 W alloy Inorganic materials 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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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
- B22F9/14—Making metallic powder or suspensions thereof using physical processes using 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
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Abstract
The invention provides a method for preparing large-granularity spherical tungsten powder by adopting a radio frequency plasma method, which comprises the steps of preparing a tungsten powder pressed blank, crushing the tungsten powder pressed blank to obtain tungsten powder particles, sieving the tungsten powder particles to obtain large-granularity precursor particles, and finally performing radio frequency plasma spheroidization on the large-granularity precursor particles to obtain the large-granularity spherical tungsten powder with the particle size of 50-100 mu m.
Description
Technical Field
The invention belongs to the field of powder metallurgy, relates to a tungsten powder preparation technology, and particularly relates to a method for preparing large-particle-size spherical tungsten powder by using a radio frequency plasma method. The spherical tungsten powder product can be used in the fields of 3D printing, thermal spraying, preparation of porous tungsten materials and the like.
Background
In recent years, with the development of science and technology, new special requirements are continuously made on raw material tungsten powder, and spherical tungsten powder is widely applied to the fields of 3D printing, thermal spraying, preparation of porous tungsten materials and the like due to excellent characteristics of the spherical tungsten powder. The large-particle spherical tungsten powder has a better effect in application due to the larger particle size and higher fluidity. When the 3D prints tungsten product, the continuity that tungsten powder carried has great influence to the final quality of processing part, and the continuity that the spherical tungsten powder of large granularity can be better guarantees the powder and carry. In the field of thermal spraying, the large-particle spherical tungsten powder has good fluidity, so that the obtained coating is more uniform and compact. The porous tungsten skeleton prepared by the large-particle-size spherical tungsten powder has more uniform pores and higher porosity, and can be applied to preparing products such as high-performance metal melt gas filters, high-ratio filling phase tungsten alloys and the like.
The existing methods for preparing spherical tungsten powder are various, such as: a halide reduction method, a reoxidation-reduction method, a rotary electrode method, a partial preferential oxidation alkali washing method, an ammonium paratungstate cyclic oxidation reduction method, a spray drying method, a microwave single-cavity method, a plasma spheroidization method, and the like.
The method for preparing the spherical tungsten powder by the radio frequency plasma method is novel, and the precursor particles adopted by the existing method for preparing the spherical tungsten powder by the radio frequency plasma method are conventional granular tungsten powder or tungsten powder obtained by airflow crushing, so that the prepared spherical tungsten powder has fine granularity.
Disclosure of Invention
In order to overcome the needs of the prior art, the invention provides a method for preparing large-granularity spherical tungsten powder by adopting a radio-frequency plasma method, and solves the problem that the granularity of the prepared spherical tungsten powder is finer due to the adoption of the radio-frequency plasma method for preparing the spherical tungsten powder.
The invention is realized by the following technical scheme:
the invention discloses a method for preparing large-particle spherical tungsten powder by adopting a radio frequency plasma method, which comprises the following steps:
preparing a tungsten powder compact;
crushing the tungsten powder compact to obtain tungsten powder particles;
sieving the tungsten powder particles to obtain precursor particles;
and carrying out radio frequency plasma spheroidization on the precursor particles to obtain large-particle-size spherical tungsten powder.
Further, the preparation of the tungsten powder compact specifically comprises the following steps:
obtaining conventional tungsten powder;
putting the conventional tungsten powder into a mold;
and placing the die containing the conventional tungsten powder in a cold isostatic press for cold isostatic pressing to obtain a tungsten powder compact.
Further, the tungsten powder pressed compact is crushed to obtain tungsten powder particles, and the method specifically comprises the following steps:
and putting the tungsten powder compact into a crusher for crushing treatment to obtain tungsten powder particles.
Further, sieving the tungsten powder particles to obtain precursor particles, which specifically comprises the following steps:
and screening the tungsten powder particles in a national standard sieve to obtain precursor particles, wherein the mesh size of the national standard sieve is 80-160 meshes.
Further, before the precursor particles are subjected to radio frequency plasma spheroidization, drying the precursor particles.
Further, the drying operation of the precursor particles specifically comprises the following steps:
and putting the precursor particles into a vacuum oven for drying operation, wherein the drying temperature is 110-150 ℃, and the drying time is 10-18 h.
Further, the method comprises the following steps of carrying out radio frequency plasma spheroidization on the precursor particles to obtain large-particle-size spherical tungsten powder:
argon is used as working gas and side gas, and a stable plasma torch is established in a radio frequency plasma generating system;
argon is used as carrier gas to carry precursor particles, the precursor particles are injected into a core region of a plasma torch through powder feeding equipment to be heated, the precursor particles are subjected to heat absorption, melting and spheroidization rapidly in the plasma torch, the precursor particles are rapidly condensed through a cooling chamber to obtain large-granularity spherical tungsten powder, and the large-granularity spherical tungsten powder is collected through a powder collecting tank.
Further, the process parameters for performing the radio frequency plasma spheroidization treatment on the precursor particles are as follows: the working gas flow is 30-35L/min, the side gas flow is 80-120L/min, the carrier gas flow is 5-7L/min, the system negative pressure of the radio frequency plasma generating system is 200-260mm Hg, the output power of the radio frequency plasma generating system is 50-70KW, and the powder feeding speed of the powder feeding equipment is 20-40 g/min.
Further, before the stable plasma torch is established in the radio frequency plasma generating system by taking the argon gas as the working gas and the edge gas, the internal vacuum-pumping treatment of the radio frequency plasma generating system is also included.
Further, the granularity of the large-granularity spherical tungsten powder is 50-100 mu m.
Further, the particle size of the conventional tungsten powder is 1-5 μm.
Further, the pressure of the cold isostatic pressing is 100-220MPa, and the pressure maintaining time is 3-10 min.
Compared with the closest prior art, the technical scheme of the invention has the following beneficial effects:
1. the invention provides a method for preparing large-granularity spherical tungsten powder by adopting a radio frequency plasma method, which comprises the steps of preparing a tungsten powder pressed blank, crushing the tungsten powder pressed blank to obtain tungsten powder particles, sieving the tungsten powder particles to obtain large-granularity precursor particles, and finally performing radio frequency plasma spheroidization on the large-granularity precursor particles to obtain the large-granularity spherical tungsten powder with the particle size of 50-100 mu m.
2. In the process of the method for preparing the large-granularity spherical tungsten powder by adopting the radio frequency plasma method, tungsten powder particles are sieved to obtain precursor particles, the particle size distribution of the obtained precursor particles can be controlled to be very centralized by sieving the tungsten powder particles and the precursor particles are in a single particle shape, and oversized and undersized tungsten powder particles are filtered, so that the precursor particles are prevented from forming satellite spheres or micro-nano particles in radio frequency plasma spheroidization operation and are adhered to the surface of the spherical tungsten powder, the powder surface smoothness and the flowability of a spherical tungsten powder finished product are improved, the production efficiency of the spherical tungsten powder finished product is improved, the powder feeding speed of powder feeding equipment is improved, and the powder amount of the spherical tungsten powder adhered to the wall of a powder collecting tank after plasma spheroidization is reduced.
3. The preparation method of the large-particle spherical tungsten powder has simple and easy operation steps and low cost, and is beneficial to mass production.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a process flow diagram of the method for preparing large-particle spherical tungsten powder by using a radio frequency plasma method according to the present invention;
FIG. 2 is an electron micrograph of a precursor particle according to example 2 of the present invention;
FIG. 3 is an electron micrograph of a spherical tungsten powder according to example 2 of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, a process flow chart of the method for preparing large-particle spherical tungsten powder by using a radio frequency plasma method of the present invention generally adopts the following ideas:
s1 preparing the tungsten powder compact specifically comprises the following steps:
s1-1, obtaining conventional tungsten powder, wherein the conventional tungsten powder is obtained by adopting the existing commercially available tungsten powder, the particle size of the conventional tungsten powder is 1-5 μm, the preferable particle size of the conventional tungsten powder is 2 μm, 3 μm and 4 μm, and the purity of the conventional tungsten powder is more than or equal to 99.9%;
s1-2, putting the conventional tungsten powder into a mould for sealing, wherein the specification and specification of the mould are not specifically limited, and a person skilled in the art can select the mould as required;
s1-3, placing the mould filled with the conventional tungsten powder in a cold isostatic press for cold isostatic pressing to obtain a tungsten powder compact, wherein the pressure of the cold isostatic pressing is 100-220MPa, the pressure maintaining time is 3-10min, the pressure of the cold isostatic pressing is preferably 120MPa, 140MPa, 160MPa, 180MPa and 200MPa, and the pressure maintaining time is preferably 5min, 7min and 9 min.
S2, crushing the tungsten powder compact to obtain tungsten powder particles, and specifically comprises the following steps:
and putting the tungsten powder compact into a crusher for crushing treatment to obtain tungsten powder particles.
S3, sieving tungsten powder particles to obtain precursor particles, and specifically comprising the following steps:
and screening the tungsten powder particles by using a national standard sieve to obtain precursor particles, wherein the mesh size of the national standard sieve is 80-160 meshes, and the mesh size of the national standard sieve is preferably 100 meshes, 120 meshes and 140 meshes.
S4, drying the precursor particles, specifically comprising the following steps:
and putting the precursor particles into a vacuum oven for drying operation, wherein the drying temperature is 110-150 ℃, the drying time is 10-18h, preferably the drying temperature is 120 ℃, and the drying time is 12 h.
S5, performing radio frequency plasma spheroidization on the precursor particles to obtain large-particle-size spherical tungsten powder, wherein the particle size of the large-particle-size spherical tungsten powder is 50-100 microns, and the method specifically comprises the following steps:
s5-1, vacuumizing the radio frequency plasma generating system to about 1.0Pa by a diffusion pump set;
s5-2, using argon as working gas and side gas, establishing stable plasma torch in the radio frequency plasma generating system;
s5-3, argon is used as carrier gas to carry precursor particles to be injected into the core region of the plasma torch for heating, the precursor particles are subjected to heat absorption, melting and spheroidization in the plasma torch rapidly, and are condensed rapidly by a cooling chamber to obtain large-granularity spherical tungsten powder, and the large-granularity spherical tungsten powder is collected by a powder collecting tank.
In the process of performing the radio frequency plasma spheroidization treatment on the precursor particles, the working gas flow is 30-35L/min, the side gas flow is 80-120L/min, the carrier gas flow is 5-7L/min, the system negative pressure of the radio frequency plasma generating system is 200-260mm Hg, the output power of the radio frequency plasma generating system is 50-70KW, and the powder feeding rate of the powder feeding equipment is 20-40 g/min.
The method for preparing the large-particle-size spherical tungsten powder by adopting the radio frequency plasma method is further explained by the following specific embodiment:
example 1
(1) Commercial tungsten powder with the particle size of 2 mu m and the purity of more than 99.9 percent is used as a raw material, and the raw material is filled into a die with the diameter of 50 x 800mm and sealed.
(2) And placing the die filled with the commercial tungsten powder in a cold isostatic press, and keeping the pressure of the cold isostatic press at 200MPa for 10min to obtain a green compact.
(3) And (3) placing the pressed compact into a high-efficiency medium crusher, and crushing in the high-efficiency medium crusher to obtain tungsten powder particles, wherein the particle size of the tungsten powder particles is controlled to be less than 3 mm.
(4) And (4) screening the obtained tungsten powder particles in a national standard sieve to obtain precursor particles with 80-100 meshes.
(5) And (3) putting the precursor particles into a vacuum oven, and drying for 10h at 110 ℃.
(6) Performing radio frequency plasma spheroidization on the precursor particles: vacuumizing the radio frequency plasma generating system to about 1.0Pa by using a diffusion pump unit; argon is used as working gas and side gas, and a stable plasma torch is established in a radio frequency plasma generating system; argon is used as carrier gas to carry dried precursor particles to be injected into a core part area of a plasma torch for heating, the precursor particles are subjected to heat absorption, melting and spheroidization in the plasma torch quickly, and are condensed quickly by a cooling chamber to obtain large-granularity spherical tungsten powder, and the large-granularity spherical tungsten powder is collected by a powder collecting tank. The spherical tungsten powder has a particle size of 100 μm and a fluidity of 6.2s/50 g.
The spheroidizing process parameters are as follows: the working gas flow is 35L/min, the side gas flow is 110L/min, the carrier gas flow is 7L/min, the system negative pressure of the radio frequency plasma generating system is 200mm Hg, the output power of the radio frequency plasma generating system is 60KW, and the powder feeding speed of the powder feeding equipment is 20 g/min.
Example 2
(1) Commercial tungsten powder with a particle size of 3.5 μm and a purity of more than 99.9% was used as a starting material, and charged into a 50 x 300 x 600mm mold and sealed.
(2) And (3) placing the die filled with the commercially available tungsten powder in a cold isostatic press, and keeping the pressure of the cold isostatic press at 180MPa for 8min to obtain a green compact.
(3) And (3) placing the pressed compact into a high-efficiency medium crusher, and crushing in the high-efficiency medium crusher to obtain tungsten powder particles, wherein the particle size of the tungsten powder particles is controlled to be less than 3 mm.
(4) And (3) screening the obtained tungsten powder particles in a national standard sieve to obtain precursor particles with the particle size of 120-140 meshes.
(5) And (3) putting the precursor particles into a vacuum oven, and drying for 12h at 120 ℃.
(6) Performing radio frequency plasma spheroidization on the precursor particles: vacuumizing the radio frequency plasma generating system to about 1.0Pa by using a diffusion pump unit; argon is used as working gas and side gas, and a stable plasma torch is established in a radio frequency plasma generating system; argon is used as carrier gas to carry dried precursor particles to be injected into a core part area of a plasma torch for heating, the precursor particles are subjected to heat absorption, melting and spheroidization in the plasma torch quickly, and are condensed quickly by a cooling chamber to obtain large-granularity spherical tungsten powder, and the large-granularity spherical tungsten powder is collected by a powder collecting tank. The spherical tungsten powder has a particle size of 60 μm and a fluidity of 6.0s/50 g.
The spheroidizing process parameters are as follows: the working gas flow is 33L/min, the side gas flow is 95L/min, the carrier gas flow is 6L/min, the system negative pressure of the radio frequency plasma generating system is 230mm Hg, the output power of the radio frequency plasma generating system is 58KW, and the powder feeding speed of the powder feeding equipment is 25 g/min.
Fig. 2 is an electron micrograph of the precursor particles of this example, from which it can be seen that: the particles are composed of fine tungsten powder, are single-particle and have uniform particle size.
FIG. 3 is an electron micrograph of the spherical tungsten powder of the present example, from which it can be seen that: the tungsten powder has high sphericity, good uniformity, smooth surface and no satellite ball or micro-nano particles.
Example 3
(1) Commercial tungsten powder with a particle size of 5 μm and a purity of more than 99.9% was used as a starting material, and charged into a 30 x 300 x 600mm mold and sealed.
(2) And placing the die filled with the commercial tungsten powder in a cold isostatic press, and keeping the pressure of the cold isostatic press at 130MPa for 5min to obtain a green compact.
(3) And (3) placing the pressed compact into a high-efficiency medium crusher, and crushing in the high-efficiency medium crusher to obtain tungsten powder particles, wherein the particle size of the tungsten powder particles is controlled to be less than 3 mm.
(4) And (3) screening the obtained tungsten powder particles in a national standard sieve to obtain precursor particles with 140-160 meshes.
(5) And (3) putting the precursor particles into a vacuum oven, and drying for 18h at 150 ℃.
(6) Performing radio frequency plasma spheroidization on the precursor particles: vacuumizing the radio frequency plasma generating system to about 1.0Pa by using a diffusion pump unit; argon is used as working gas and side gas, and a stable plasma torch is established in a radio frequency plasma generating system; argon is used as carrier gas to carry dried precursor particles to be injected into a core part area of a plasma torch for heating, the precursor particles are subjected to heat absorption, melting and spheroidization in the plasma torch quickly, and are condensed quickly by a cooling chamber to obtain large-granularity spherical tungsten powder, and the large-granularity spherical tungsten powder is collected by a powder collecting tank. The spherical tungsten powder has a particle size of 50 μm and a fluidity of 6.0s/50 g.
The spheroidizing process parameters are as follows: the working gas flow is 32L/min, the side gas flow is 80L/min, the carrier gas flow is 5L/min, the system negative pressure of the radio frequency plasma generating system is 260mm Hg, the output power of the radio frequency plasma generating system is 55KW, and the powder feeding speed of the powder feeding equipment is 30 g/min.
Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the claims of the present application.
Claims (12)
1. The method for preparing the large-particle-size spherical tungsten powder by adopting the radio frequency plasma method is characterized by comprising the following steps of:
preparing a tungsten powder compact;
crushing the tungsten powder compact to obtain tungsten powder particles;
sieving the tungsten powder particles to obtain precursor particles;
and carrying out radio frequency plasma spheroidization on the precursor particles to obtain large-particle-size spherical tungsten powder.
2. The method for preparing the large-particle-size spherical tungsten powder by using the radio frequency plasma method according to claim 1, wherein the preparation of the tungsten powder compact specifically comprises the following steps:
obtaining conventional tungsten powder;
putting the conventional tungsten powder into a mold;
and placing the die containing the conventional tungsten powder in a cold isostatic press for cold isostatic pressing to obtain a tungsten powder compact.
3. The method for preparing large-particle-size spherical tungsten powder by using a radio frequency plasma method according to claim 1, wherein the tungsten powder compact is crushed to obtain tungsten powder particles, and the method specifically comprises the following steps:
and putting the tungsten powder compact into a crusher for crushing treatment to obtain tungsten powder particles.
4. The method for preparing large-particle-size spherical tungsten powder by using a radio frequency plasma method according to claim 1, wherein the tungsten powder particles are sieved to obtain precursor particles, and the method specifically comprises the following steps:
and screening the tungsten powder particles in a national standard sieve to obtain precursor particles, wherein the mesh size of the national standard sieve is 80-160 meshes.
5. The method for preparing large-particle-size spherical tungsten powder by using the radio-frequency plasma method according to claim 1, wherein before the subjecting the precursor particles to the radio-frequency plasma spheroidization, the method further comprises drying the precursor particles.
6. The method for preparing large-particle-size spherical tungsten powder by using a radio frequency plasma method according to claim 5, wherein the drying operation of the precursor particles specifically comprises the following steps:
and putting the precursor particles into a vacuum oven for drying operation, wherein the drying temperature is 110-150 ℃, and the drying time is 10-18 h.
7. The method for preparing large-particle spherical tungsten powder by using a radio frequency plasma method according to claim 1, wherein the precursor particles are subjected to radio frequency plasma spheroidization to obtain the large-particle spherical tungsten powder, and the method specifically comprises the following steps:
argon is used as working gas and side gas, and a stable plasma torch is established in a radio frequency plasma generating system;
argon is used as carrier gas to carry precursor particles, the precursor particles are injected into a core region of a plasma torch through powder feeding equipment to be heated, the precursor particles are subjected to heat absorption, melting and spheroidization rapidly in the plasma torch, the precursor particles are rapidly condensed through a cooling chamber to obtain large-granularity spherical tungsten powder, and the large-granularity spherical tungsten powder is collected through a powder collecting tank.
8. The method for preparing large-particle-size spherical tungsten powder by using the radio-frequency plasma method according to claim 7, wherein the process parameters for performing the radio-frequency plasma spheroidization on the precursor particles are as follows: the working gas flow is 30-35L/min, the side gas flow is 80-120L/min, the carrier gas flow is 5-7L/min, the system negative pressure of the radio frequency plasma generating system is 200-260mm Hg, the output power of the radio frequency plasma generating system is 50-70KW, and the powder feeding speed of the powder feeding equipment is 20-40 g/min.
9. The method for preparing large-particle-size spherical tungsten powder by using the radio frequency plasma method according to claim 7, wherein the argon gas is used as a working gas and a side gas, and before a stable plasma torch is established in the radio frequency plasma generation system, the method further comprises vacuumizing the inside of the radio frequency plasma generation system.
10. The method for preparing large-particle spherical tungsten powder by using a radio frequency plasma method according to claim 1, wherein the particle size of the large-particle spherical tungsten powder is 50-100 μm.
11. The method for preparing large-particle-size spherical tungsten powder by using a radio frequency plasma method according to claim 2, wherein the particle size of the conventional tungsten powder is 1 to 5 μm.
12. The method for preparing large-particle-size spherical tungsten powder by using the radio frequency plasma method according to claim 2, wherein the pressure of the cold isostatic pressing is 100-220MPa, and the pressure holding time is 3-10 min.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006009113A (en) * | 2004-06-29 | 2006-01-12 | Hitachi Metals Ltd | Method for producing fine metal ball |
| CN101224500A (en) * | 2007-12-17 | 2008-07-23 | 金堆城钼业股份有限公司 | Super particle size molybdenum powder preparing method |
| CN106001594A (en) * | 2016-07-15 | 2016-10-12 | 北京科技大学 | Preparation method for ultra-coarse spherical tungsten powder |
| CN107470639A (en) * | 2017-09-18 | 2017-12-15 | 北京科技大学 | A kind of preparation method of narrow size distribution globular tungsten powder |
| WO2018121688A1 (en) * | 2016-12-29 | 2018-07-05 | 江民德 | 3d printing spherical powder preparation method utilizing plasma |
| CN110257781A (en) * | 2019-05-31 | 2019-09-20 | 河北宏靶科技有限公司 | A kind of chromium aluminium tantnickel quaternary alloy target and preparation method thereof |
| CN110576180A (en) * | 2019-09-25 | 2019-12-17 | 福建阿石创新材料股份有限公司 | preparation method of molybdenum powder with low oxygen content |
| CN111250723A (en) * | 2018-12-03 | 2020-06-09 | 上海大境海洋新材料有限公司 | Method for producing spherical tungsten alloy powder by radio frequency plasma |
-
2020
- 2020-09-25 CN CN202011022797.7A patent/CN114247894A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006009113A (en) * | 2004-06-29 | 2006-01-12 | Hitachi Metals Ltd | Method for producing fine metal ball |
| CN101224500A (en) * | 2007-12-17 | 2008-07-23 | 金堆城钼业股份有限公司 | Super particle size molybdenum powder preparing method |
| CN106001594A (en) * | 2016-07-15 | 2016-10-12 | 北京科技大学 | Preparation method for ultra-coarse spherical tungsten powder |
| WO2018121688A1 (en) * | 2016-12-29 | 2018-07-05 | 江民德 | 3d printing spherical powder preparation method utilizing plasma |
| CN107470639A (en) * | 2017-09-18 | 2017-12-15 | 北京科技大学 | A kind of preparation method of narrow size distribution globular tungsten powder |
| CN111250723A (en) * | 2018-12-03 | 2020-06-09 | 上海大境海洋新材料有限公司 | Method for producing spherical tungsten alloy powder by radio frequency plasma |
| CN110257781A (en) * | 2019-05-31 | 2019-09-20 | 河北宏靶科技有限公司 | A kind of chromium aluminium tantnickel quaternary alloy target and preparation method thereof |
| CN110576180A (en) * | 2019-09-25 | 2019-12-17 | 福建阿石创新材料股份有限公司 | preparation method of molybdenum powder with low oxygen content |
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