CN108213451A - A kind of method and apparatus of metal powder nodularization - Google Patents
A kind of method and apparatus of metal powder nodularization Download PDFInfo
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- CN108213451A CN108213451A CN201611150553.0A CN201611150553A CN108213451A CN 108213451 A CN108213451 A CN 108213451A CN 201611150553 A CN201611150553 A CN 201611150553A CN 108213451 A CN108213451 A CN 108213451A
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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
-
- 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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/06—Metallic powder characterised by the shape of the particles
- B22F1/065—Spherical particles
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/62645—Thermal treatment of powders or mixtures thereof other than sintering
- C04B35/62665—Flame, plasma or melting treatment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/62695—Granulation or pelletising
Abstract
The present invention relates to a kind of method and apparatus for preparing spherical powder, are in particular the method and apparatus that aspherical powder is carried out to spheroidising.The present invention is heated by the way that raw material powder is sent into DC arc plasma flame stream, and powder melts and nodularization occurs under the action of surface tension, and then cooling obtains spherical powder into collector in inert gas.Using the powder sphericity of this method acquisition is high, surface is smooth, interior solid defect is few, good fluidity；Internal cycle can be achieved in plasma gas and powder cooler environment gas, reduces inert gas dosage, reduces production cost.It is especially applicable to the nodularization of refractory metal powder, it can also be used to the nodularization of other alloy powders and ceramic powders.
Description
Technical field
The present invention relates to a kind of method and apparatus for preparing spherical powder, are in particular that aspherical powder is carried out ball
Change the method and apparatus of processing.The present invention is heated by the way that raw material powder is sent into DC arc plasma flame stream, powder fusing
And nodularization occurs under the action of surface tension, then cooling obtains spherical powder into collector in inert gas.Using
The powder sphericity of this method acquisition is high, surface is smooth, interior solid defect is few, good fluidity；Plasma gas and powder
Internal cycle can be achieved in cooler environment gas, reduces inert gas dosage, reduces production cost.It is it is especially applicable to difficult
The nodularization of molten metal powder, it can also be used to the nodularization of other alloy powders and ceramic powders.
Background technology
The compactness and sphericity of powder have the quality of thermal spraying, powder metallurgy and 3D printing product particularly important
Influence.Generally, it is considered that the powder that sphericity is high, compactness is good helps to obtain the final products of high-quality.Compared to aspheric
Shape powder, spherical powder mainly have the advantage that：(1) mobility of powder is helped to improve；(2) contribute to reduce powder
Porosity improves the bulk density of powder；(3) powder brittleness is reduced, after spraying to piece surface, it is possible to reduce burr, dusting
With it is broken；(4) improve surface smoothness, reduce satellite powder, improve anti-caking power.
At present, it is disclosed through patent there are many method for preparing spherical powder or document report, such as：Publication No.
The patent of EP0400659A1 and CN2855596 discloses the method and apparatus using argon gas powder by atomization, powder by atomization method yield
Higher with fine powder recovery rate, but need to expend a large amount of gases (such as Ar), production cost is higher, and can not prepare W, Mo, Ta and
The refractory metals such as Nb or alloy powder；The patent of Publication No. US005707419A then using 3 and more than plasma gun,
Metal wire material or powder are sent into plasma flame flow joint after special angle is put, mist is realized using high speed plasma jet
Change powder processed, but due to flame stream joint apart from electric arc root farther out, plasma temperature is relatively low, thus this method be only applicable to compared with
Prepared by the powder of low-melting-point metal or alloy, can not still prepare refractory metal and its alloy powder；Delivered document " Guo Shuanquan,
Ge Changchun, Feng Yunbiao, Zhou Zhangjian low cost plasma body spheronization techniques prepare the technical study powder of globular tungsten powder used for hot spraying
Last metallurgical industry, 2010,2 (3)：1-4 " realizes W spheroidizings of powder using direct-current plasma, by the way that irregular powder is sent into
Plasma flame stream after the heated fusing of powder, is changed into spherical shape under the action of surface tension, sprays into deionized water and cool down
After can obtain spherical powder, this method nodularization cost is relatively low, but spheroidizing of powder and cooling do not carried out under protective atmosphere, Surface Oxygen
Change affects powder properties；The patent of Publication No. JP-A-2002-180112 and delivered document " H.J.Hedger,
A.R.Hall.Preparation of sphe rical powder [J] .Powder Metallurgy, 1961,8：65 ",
" P.Linke, S.Zakharian, K.-H.Weiss, G.Nutsch.Manufacturing of spherical Tungsten
Carbide powders with the thermal RF inductively coupled plasma ", " Wang Jianjun, Hao Jun
Outstanding person, the bright radio frequency plasmas of Guo Zhimeng, Wang Yu prepare spherical niobium powder, Materials Science and Engineering of Powder Metallurgy, 2014,19 (3)：
361-366 " etc. realizes spheroidizing of powder using radio frequency plasma, i.e., will enter powder therein using high temperature radio frequency plasma
Simultaneously nodularization is heated, but since radio frequency plasma has Kelvin effect, plasma interior temperature distribution is uneven, causes to produce
It is inefficient；The patent of the US7318363B2 of Publication No. is further improved above-mentioned radio frequency plasma spheronization process,
By setting helical form guide card in powder feeding pipe, powder can be sent into the higher temperature region of radio frequency plasma, improve powder
Last nodularization efficiency, but radio frequency plasma energy conversion efficiency is relatively low, and hardware cost is higher, is provided with for its commercial Application higher
Threshold.
Invention content
The present invention relates to a kind of method and apparatus for preparing spherical powder.The powder ball obtained using the method for the invention
Shape degree is high, surface is smooth, interior solid defect is few, good fluidity；Equipment of the present invention can realize inert gas in equipment
Portion recycles, and reduces inert gas dosage, reduces production cost.
The present invention obtains spherical powder by the way that aspherical powder is carried out spheroidising, and the aspherical raw material powder can
Think metal powder or ceramic powders.It is especially applicable to the ball of high-melting-point refractory metal (W, Mo, Ta and Nb etc.) powder
Change.
Heretofore described spheroidizing of powder process is sent into straight for aspherical raw material powder with special angle and powder feeding rate
Galvanic electricity arc plasma flame stream, powder melt in hot flame stream and nodularization occur under the action of surface tension.The ball
Change after powder is sprayed with plasma jet and cool down in an inert atmosphere, and received in powder catcher and cyclone separator
Collection.Realize that the device of the above process includes：1) spheroidizing of powder cavity；2) Powder Recovery cavity；3) cyclone separator；4) heat exchange
Device；5) dust filter unit；6) centrifugal blower；7) vacuum system；8) an at least plasma generator (containing power supply)；9) powder feeding
Device；10) powder tank is stored up；11) gas compressor；12) air accumulator；13) pipeline and valve of each section are connected；14) pressure measurement fills
It puts；15) cooling water system.
Heretofore described plasma is obtained by gas direct-current discharge, and usual voltage range is 20-80V, and electric current is
250-800A。
Heretofore described plasma gas and powder cooling environmental gas are gas of the same race, can be Ar, He,
N2, H2Or its gaseous mixture.Gaseous species and ratio will control plasma discharge voltage and electric current, and design parameter depends on treating ball
Change the type and particle diameter distribution of powder.
The plasma gas and powder cooling gas are recycled respectively by 2 sets of circulator realizations.Deng from
Daughter gas-recycling plant realizes that gas compressor can be piston compressor or screw compression by gas compressor and air accumulator
Machine, air demand are not less than 100l/min；Gas storage tankage size is not less than 0.3m3, it is 0.6-0.8MPa that gas, which maintains pressure,.Cool down gas
Body circulation is realized by centrifugal blower, can realize that air circulation is 2000-10000m by frequency-variable controller3/h.Plasma gas
Body and cooling gas cool down and dust filter unit dedusting before each self-circulation system is entered through gas heat-exchanger.
Description of the drawings
Fig. 1 spheroidizing of powder schematic devices
Fig. 2 radial direction automatic powder feeding system schematic diagrames
W powder morphologies before Fig. 3 nodularizations
W powder morphologies after Fig. 4 nodularizations
W powder diameter profiles versus before and after Fig. 5 nodularizations
W powder sphericity comparison before and after Fig. 6 nodularizations
The cross-section photograph of W powder after Fig. 7 nodularizations
TiC powder pattern before Fig. 8 nodularizations
TiC powder pattern after Fig. 9 nodularizations
Specific embodiment
Below in conjunction with attached drawing, the present invention will be further described.
Fig. 1 show the principle schematic that spheroidizing of powder device is realized in the present invention：Plasma generator 8 is mounted on powder
In nodularization cavity 1, direct-current plasma is generated by plasma generator 8, treats that nodularization raw material powder is sent by powder feeder 9 through carrier gas
It to plasma generator 8, and is sprayed after being heated by direct-current plasma, powder occurs to melt and under surface tension effects change
For spherical shape, then solidification forms spherical powder under circulating cooling airflow function.Spherical powder is fallen into powder by gravity and returned
It receives in cavity 2, is collected in powder tank 10 is stored up.A small amount of fine powder enters cyclone separator under circulating current effect through pipeline 13
3, and collected in storage powder tank 10 '.
The working gas and the environment gas for powder cooling that inert gas of the present invention is both plasma generator 8
Body, inert gas, which can be recycled, reduces cost.2 sets of gas-recycling plants are shared in the present apparatus：1) powder cooling environment gas
Solid arrow indicates the direction of motion in the endless form of body such as Fig. 1：Gas is through spheroidizing of powder cavity 1 and Powder Recovery cavity 2
Enter cyclone separator 3 afterwards, subsequently enter and carry out entering dust-filtering after heat exchange causes high-temperature gas cooling in heat exchanger 4
Device 5, clean gas enters centrifugal blower 6 after completing dust separation, and realizes cycle under impeller effect, through pipeline 13 again into
Enter spheroidizing of powder cavity 1；2) the gases used circulating path of plasma generator 8 as in Fig. 1 dotted arrow indicate direction：Gas
Body through centrifugal blower 6 enter pipeline rear portion through pipeline 16 enter gas compressor 11, it is pressurized after in air accumulator 12 shape
Into high pressure gas, plasma generator 8 and powder feeder 9 are then respectively enterd.
Plasma generator 8 generates amount of heat, therefore spheroidizing of powder cavity 1, Powder Recovery cavity when the present apparatus works
2nd, cyclone separator 3 and heat exchanger 4 are Double water-cooled structure, and cooling water is provided by cooling water system 15.
Powder feeder in the present apparatus, which can be used, scrapes disc type powder feeder or screw powder feeder.
Pressure measurer 14 and 14 ' can measure circulating cooling gas and enter spheroidizing of powder cavity 1 and export powder respectively
Gas pressure intensity during cavity 2 is recycled, the gas pressure intensity that pressure measurer 14 measures during steady operation should be higher than that pressure measurement fills
14 ' the gas pressure intensity measured at least 20kPa are put, to meet the flow demand of powder cooling recyclegas, this pressure difference is by adjusting
Whole 6 rotating speed of centrifugal blower is realized.
Powder is radially sent into plasma generator 8 using nozzle internal powder conveying mode, and mode of being sent into can be unilateral or double
Side axial powder feed, schematic diagram are as shown in Figure 2.According to powder sort and grain size, powder is sent into position can be apart from plasma flame flow
Exit l=5-15mm, being sent into angle can be with radial direction in θ=- 20 ° -+20 °, powder sending quantity 20-150g/min.Internal powder conveying
Mode can improve the ratio that powder is sent into plasma flame flow, avoid generating " fecula ".
The present apparatus is provided with the work of flow deflector, wherein flow deflector 17 in spheroidizing of powder cavity 1 and Powder Recovery cavity 2
With being that constraint circulating cooling gas is converged to chamber central, powder quick cooling prevents powder to be adhered to chamber to a certain extent
Internal wall；The effect of flow deflector 18 is that guiding powder after cooling enters the Powder Recovery cavity 2 of lower part and storage powder tank 10, is prevented
Excessive powder enters cyclone separator 3 under airflow function, and only a small amount of fine powder can enter cyclone separator 3.
Concrete operation step is：
1) cooling water system 15 is opened, it is ensured that spheroidizing of powder cavity 1, Powder Recovery cavity 2, cyclone separator 3, heat exchange
Device 4 and 8 flow of plasma generator are unimpeded；
2) entire cavity is evacuated to after -0.1MPa by startup vacuum system 7 fills appropriate inert gas to normal pressure；
3) it is 0.6-0.8MPa to start pressure in gas compressor 11 to air accumulator 12, and stopping is filled with gas；
4) start centrifugal blower 6 and realize cooling gas cycle, it is ensured that the gas pressure intensity that pressure measurer 14 and 14 ' measures
Difference is higher than 20kPa；The gas supply of plasma generator 8 is opened, pressure is in 11 continuous firing of gas compressor maintenance air accumulator 12
0.6-0.8MPa realizes plasma (orifice) gas cycle；
5) start plasma generator 8, adjusting operating voltage range is 20-80V, electric current 250-800A；
6) start powder feeder 9, powder feeding plasma generator 8 is subjected to spheroidising；
7) powder feeder and plasma generator 8 are closed after powder is exhausted in powder feeder 9, is then turned off centrifugal blower 8
With gas compressor 11；
8) storage powder tank 10 and 10 ' is removed, obtains spherical powder.
Specific embodiment 1：
Using Ar and H2Gaseous mixture (volume ratio 4: 1) is working gas, treats that nodularization W Powder Particle Sizes are distributed as 45-75 μm, etc.
Ion generator operating voltage is 70V, electric current 550A, powder sending quantity 60g/min, and bilateral powder feeding, powder feeding angle is+15 °.Figure
3 be W powder morphologies before nodularization, and powder is into irregular shape；Fig. 4 is the W powder morphologies after nodularization, it is seen that most of W powder particles
It is changed into spherical shape.Fig. 5 is the particle diameter distribution comparison before and after the W spheres of powder, and powder size is increased slightly after spheroidising；Fig. 6 is W
Sphericity comparison before and after spheroidizing of powder, 90% powder circularity is more than 0.8 after spheroidising.Fig. 7 is powder after nodularization
Cross-section photograph, it is finer and close inside powder.
Specific embodiment 2：
Ar is used as working gas, treats that nodularization TiC Powder Particle Sizes are distributed as 45-75 μm, plasma generator operating voltage is
45V, electric current 500A, powder sending quantity 30g/min, bilateral powder feeding, powder feeding angle are 0 °.Fig. 8 is TiC powder pattern before nodularization,
Powder is into irregular shape；Fig. 9 is the TiC powder pattern after nodularization, it is seen that most of TiC powder smooth surface, a small amount of
Grain is circular, illustrates that nodularization effect is apparent.It is expected that increase plasma generator power can further promote spheroidizing of powder rate.
Claims (3)
1. in particular it is that aspherical powder is subjected to nodularization the present invention relates to a kind of method and apparatus for preparing spherical powder
The method and apparatus of processing, the present invention are heated by the way that raw material powder is sent into DC arc plasma flame stream, and powder melts simultaneously
Nodularization occurs under the action of surface tension, then cooling obtains spherical powder into collector in inert gas, using this
The powder sphericity of method acquisition is high, surface is smooth, interior solid defect is few, good fluidity；Plasma gas and powder are cold
But internal cycle can be achieved in environmental gas, reduces inert gas dosage, production cost is reduced, it is especially applicable to infusibility
The nodularization of metal powder, it can also be used to the nodularization of other alloy powders and ceramic powders.
2. according to claim 1 heretofore described spheroidizing of powder process for aspherical raw material powder with special angle and
Powder feeding rate is sent into DC arc plasma flame stream, and powder is melted in hot flame stream and occurred under the action of surface tension
Nodularization；The nodularization powder cools down, and after being sprayed with plasma jet in powder catcher and whirlwind in an inert atmosphere
It is collected in separator；Realize that the device of the above process includes：1) spheroidizing of powder cavity；2) Powder Recovery cavity；3) whirlwind
Separator；4) heat exchanger；5) dust filter unit；6) centrifugal blower；7) vacuum system；8) an at least plasma generator
(containing power supply)；9) powder feeder；10) powder tank is stored up；11) gas compressor；12) air accumulator；13) pipeline and valve of each section are connected
Door；14) device for pressure measurement；15) cooling water system.
Heretofore described plasma is obtained by gas direct-current discharge, and usual voltage range is 20-80V, electric current 250-
800A。
3. heretofore described plasma gas according to claim 1 and powder cooling environmental gas are of the same race
Gas can be Ar, He, N2, H2Or its gaseous mixture；Gaseous species and ratio will control plasma discharge voltage and electric current, tool
Body parameter depends on treating the type and particle diameter distribution of nodularization powder.
The plasma gas and powder cooling gas are recycled respectively by 2 sets of circulator realizations；Plasma
Gas-recycling plant realized by gas compressor and air accumulator, and gas compressor can be piston compressor or helical-lobe compressor,
Air demand is not less than 100l/min；Gas storage tankage size is not less than 0.3m3, it is 0.6-0.8MPa that gas, which maintains pressure,；Cooling gas
Cycle is realized by centrifugal blower, can realize that air circulation is 2000-10000m by frequency-variable controller3/h；Plasma gas
Cool down and dust filter unit dedusting through gas heat-exchanger before each self-circulation system is entered with cooling gas.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109727745A (en) * | 2018-12-17 | 2019-05-07 | 北京康普锡威科技有限公司 | Iron-based soft magnetic composite material and preparation method |
| CN110834090A (en) * | 2019-12-13 | 2020-02-25 | 黑龙江省科学院高技术研究院 | Metal powder shaping, refining and purifying device and method |
| CN110919013A (en) * | 2019-12-11 | 2020-03-27 | 湖南天际智慧材料科技有限公司 | Metal powder flame spheroidizing equipment and processing technology thereof |
| RU197530U1 (en) * | 2020-03-16 | 2020-05-12 | федеральное государственное автономное образовательное учреждение высшего образования «Национальный исследовательский Томский политехнический университет» | Device for spheroidizing a composite metal-containing powder for 3D printing |
| CN111422874A (en) * | 2020-03-27 | 2020-07-17 | 上海海事大学 | Method for producing spherical titanium carbide powder by one-step method |
| CN111545766A (en) * | 2020-06-23 | 2020-08-18 | 柯良节 | Equipment and method for preparing high-purity spherical metal powder |
| CN112169625A (en) * | 2020-09-09 | 2021-01-05 | 江西澳科新材料科技有限公司 | Tungsten alloy banburying device |
| CN112408473A (en) * | 2020-12-10 | 2021-02-26 | 合肥中航纳米技术发展有限公司 | Method for preparing nano zirconium dioxide powder by using plasma arc |
| CN112643020A (en) * | 2020-12-09 | 2021-04-13 | 同济大学 | Metal powder spheroidizing shaping device and using method thereof |
| CN112723399A (en) * | 2020-12-10 | 2021-04-30 | 合肥中航纳米技术发展有限公司 | Plasma arc flame combustion reaction system and method for preparing high-purity gamma-Al by using same2O3Method (2) |
| CN112820872A (en) * | 2019-11-15 | 2021-05-18 | 深圳市贝特瑞纳米科技有限公司 | Ternary cathode material, preparation method thereof and lithium ion battery |
| CN113492212A (en) * | 2020-04-07 | 2021-10-12 | Ap&C高端粉末涂料公司 | High quality powder forming method for additive manufacturing processes |
| CN114082969A (en) * | 2021-11-30 | 2022-02-25 | 中机凯博表面技术江苏有限公司 | Plasma remelting system and process for thermal spraying of ultrafine powder |
| CN114394604A (en) * | 2022-01-20 | 2022-04-26 | 上海海事大学 | Preparation method of superhard spherical tungsten boride powder |
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| CN109727745A (en) * | 2018-12-17 | 2019-05-07 | 北京康普锡威科技有限公司 | Iron-based soft magnetic composite material and preparation method |
| CN112820872A (en) * | 2019-11-15 | 2021-05-18 | 深圳市贝特瑞纳米科技有限公司 | Ternary cathode material, preparation method thereof and lithium ion battery |
| CN110919013A (en) * | 2019-12-11 | 2020-03-27 | 湖南天际智慧材料科技有限公司 | Metal powder flame spheroidizing equipment and processing technology thereof |
| CN110834090A (en) * | 2019-12-13 | 2020-02-25 | 黑龙江省科学院高技术研究院 | Metal powder shaping, refining and purifying device and method |
| RU197530U1 (en) * | 2020-03-16 | 2020-05-12 | федеральное государственное автономное образовательное учреждение высшего образования «Национальный исследовательский Томский политехнический университет» | Device for spheroidizing a composite metal-containing powder for 3D printing |
| CN111422874A (en) * | 2020-03-27 | 2020-07-17 | 上海海事大学 | Method for producing spherical titanium carbide powder by one-step method |
| CN113492212A (en) * | 2020-04-07 | 2021-10-12 | Ap&C高端粉末涂料公司 | High quality powder forming method for additive manufacturing processes |
| CN113492212B (en) * | 2020-04-07 | 2023-09-15 | Ap&C高端粉末涂料公司 | High quality powder forming method for additive manufacturing process |
| US11654483B2 (en) | 2020-04-07 | 2023-05-23 | General Electric Company | Method for forming high quality powder for an additive manufacturing process |
| CN111545766A (en) * | 2020-06-23 | 2020-08-18 | 柯良节 | Equipment and method for preparing high-purity spherical metal powder |
| CN112169625A (en) * | 2020-09-09 | 2021-01-05 | 江西澳科新材料科技有限公司 | Tungsten alloy banburying device |
| CN112643020A (en) * | 2020-12-09 | 2021-04-13 | 同济大学 | Metal powder spheroidizing shaping device and using method thereof |
| CN112643020B (en) * | 2020-12-09 | 2022-05-17 | 同济大学 | Metal powder spheroidizing shaping device and using method thereof |
| CN112723399A (en) * | 2020-12-10 | 2021-04-30 | 合肥中航纳米技术发展有限公司 | Plasma arc flame combustion reaction system and method for preparing high-purity gamma-Al by using same2O3Method (2) |
| CN112408473A (en) * | 2020-12-10 | 2021-02-26 | 合肥中航纳米技术发展有限公司 | Method for preparing nano zirconium dioxide powder by using plasma arc |
| CN114082969A (en) * | 2021-11-30 | 2022-02-25 | 中机凯博表面技术江苏有限公司 | Plasma remelting system and process for thermal spraying of ultrafine powder |
| CN114394604A (en) * | 2022-01-20 | 2022-04-26 | 上海海事大学 | Preparation method of superhard spherical tungsten boride powder |
| CN114394604B (en) * | 2022-01-20 | 2024-04-02 | 上海海事大学 | Preparation method of superhard spherical tungsten boride powder |
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