CN105618773A - Gas atomization device for preparing 3D printing metal powder - Google Patents
Gas atomization device for preparing 3D printing metal powder Download PDFInfo
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- CN105618773A CN105618773A CN201610162837.5A CN201610162837A CN105618773A CN 105618773 A CN105618773 A CN 105618773A CN 201610162837 A CN201610162837 A CN 201610162837A CN 105618773 A CN105618773 A CN 105618773A
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- atomization
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- 239000000843 powder Substances 0.000 title claims abstract description 48
- 238000009689 gas atomisation Methods 0.000 title claims abstract description 18
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 17
- 239000002184 metal Substances 0.000 title claims abstract description 17
- 238000010146 3D printing Methods 0.000 title claims abstract description 10
- 238000003860 storage Methods 0.000 claims abstract description 64
- 238000000889 atomisation Methods 0.000 claims abstract description 31
- 230000008878 coupling Effects 0.000 claims description 16
- 238000010168 coupling process Methods 0.000 claims description 16
- 238000005859 coupling reaction Methods 0.000 claims description 16
- 239000007921 spray Substances 0.000 claims description 8
- 230000008602 contraction Effects 0.000 claims 1
- 239000002245 particle Substances 0.000 abstract description 10
- 238000002360 preparation method Methods 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 66
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 42
- 229910052786 argon Inorganic materials 0.000 description 21
- 229910000838 Al alloy Inorganic materials 0.000 description 10
- UQZIWOQVLUASCR-UHFFFAOYSA-N alumane;titanium Chemical compound [AlH3].[Ti] UQZIWOQVLUASCR-UHFFFAOYSA-N 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 238000009826 distribution Methods 0.000 description 7
- 239000007788 liquid Substances 0.000 description 7
- 238000001816 cooling Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000002663 nebulization Methods 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 229910000619 316 stainless steel Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- 239000000443 aerosol Substances 0.000 description 1
- 238000012387 aerosolization Methods 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000003064 anti-oxidating effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- B22F9/06—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
-
- 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
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
- Powder Metallurgy (AREA)
Abstract
本发明为金属粉末制备技术与应用领域中的一种制备3D打印金属粉末的气雾化装置，该气雾化装置包括上端盖、穿过上端盖轴心位置的导流管、固连于上端盖且对称于导流管设置的气腔室；所述的气腔室由内向外设置三层可拆卸气体储存腔，各气体储存腔分别固连紧耦合雾化喷嘴、层流雾化喷嘴、超声雾化喷嘴；上端盖对称于轴线分别开有三个进气口，且连通各气体储存腔的腔室，本发明的通过在喷嘴结构中加入三层雾化结构，通过升降导流管，组装喷嘴来实现不同级数之间的转换和组合，发挥各种雾化技术的优势，同时补足单一雾化技术中存在的问题，提高气雾化的稳定性，实现高性能粉末的制备，并且改善雾化效果和出粉成品率，实现成品粉末粒径的可控可调。
The present invention is a gas atomization device for preparing 3D printing metal powder in the field of metal powder preparation technology and application. The air chamber is covered and symmetrical to the air guide tube; the air chamber is provided with three layers of detachable gas storage chambers from the inside to the outside, and each gas storage chamber is respectively tightly coupled with the atomizing nozzle, laminar flow atomizing nozzle, Ultrasonic atomizing nozzle; the upper end cover is symmetrical to the axis and has three air inlets, which are connected to the chambers of each gas storage chamber. The present invention adds a three-layer atomization structure to the nozzle structure, and through the lifting guide tube, the assembly Nozzles are used to realize the conversion and combination between different stages, give full play to the advantages of various atomization technologies, and at the same time make up for the problems existing in the single atomization technology, improve the stability of gas atomization, realize the preparation of high-performance powder, and improve The atomization effect and powder yield can realize the controllable and adjustable particle size of the finished powder.
Description
Technical field
The invention belongs to metal powder preparation technology and application field, in particular to a kind of gas atomization device printing metal-powder for the preparation of 3D.
Background technology
Tight coupling atomization technique is a kind of atomization technique confined type nozzle structure transformed. Owing to its air stream outlet to the distance of liquid stream reaches the shortest, thus improve the transmission efficiency of gas kinetic energy. This kind of technology is adopted by most of atomising unit at present. The advantage of atomized powder is fines recovery rate height, and particle diameter is little, and (mean particle size such as ferroalloy powder reaches (10��20 ��m), narrow particle size distribution, and speed of cooling height is conducive to the production of rapid condensation alloy or amorphous powdered alloy. Its shortcoming is when atomization air pressure is increased to certain value, and catheter exit will produce malleation, and atomization process can not be carried out.
Conventional nozzle has been improved by laminar flow atomization technique, and the atomizing nozzle nebulization efficiency height after improvement, powder size narrowly distributing, speed of cooling reaches 106��107K/s. Under the atomizing pressure of 2.0MPa, with Ar or N2For medium atomization copper, aluminium, 316L stainless steel etc., powder mean particle sizes reaches 10 ��m. And gas consumption is low, remarkable in economical benefits, and it is applicable to the production of most metals powder. Its shortcoming is that technical controlling difficulty is big, and atomization process is unstable, and output little (metal quality flow rate is less than 1kg/min), is unfavorable for suitability for industrialized production.
Ultrasonic tight coupling atomization technique is that tight coupling circular seam type nozzle is carried out composition optimizes, makes the velocity of discharge of air-flow exceed the velocity of sound, and increases the mass flow rate of metal. When the metal of atomization high surface energy is such as stainless steel, powder mean particle sizes can reach about 20 ��m, and the standard deviation of powder is minimum can be down to 1.5 ��m. The speed of cooling substantially increasing powder of this technology, it is possible to the powder of production rapid cooling or non-crystalline substance knot.
Application number 201410030935.4 discloses a kind of three grades of atomisation units, but this device is after double atomization terminates, owing to the cooling rate under high pressure gas of molten drop is extremely fast, therefore beyond nozzle, add rotation shredder assembly, make this device cannot ensure the homogeneity of size distribution and higher sphericity, 3D can not be met and print the requirement to powder characteristics.
At present, the aspects such as the main problem that domestic powdered alloy manufacturing equipment exists concentrates on molten drop nebulization efficiency, spheroidization is low and is oxidized, mobility is poor, comprising: the stability (being mingled with quantity, homogeneity of ingredients) 1. preparing powder composition; 2. the stability (ball degree, mobility) of equipment atomizing effect; 3. equipment powder delivery yield rate problem (narrow granularity section powder yield rate is low) etc. Therefore for requirements such as low oxygen content, fine grain size powder, still need and carry out the research work of fine grain size powder gas-atomized powder equipment.
Summary of the invention
It is applicable to the situations such as the metal-powder particle diameter that 3D prints is thick, ball type degree is low, size distribution is uneven for domestic, it is an object of the invention to provide the gas atomization device of a kind of metal-powder printed for the preparation of 3D.
The present invention is a kind of technical scheme for the preparation of the gas atomization device of 3D printing metal-powder:
This gas atomization device comprise upper end cover, through upper end cover shaft core position thrust-augmenting nozzle, be fixed on upper end cover and be symmetrical in thrust-augmenting nozzle arrange gas chamber;
Gas chamber arranges three layers of dismountable gas storage chamber from inside to outside, is respectively the first gas storage chamber, the 2nd gas storage chamber, the 3rd gas storage chamber;
First gas storage chamber, the 2nd gas storage chamber, the 3rd gas storage chamber are all connected to upper end cover; First gas storage chamber, the 2nd gas storage chamber, the 3rd gas storage chamber are connected tight coupling atomizing nozzle, laminar flow atomizing nozzle, ultrasonic atomizing nozzle respectively;
Upper end cover is symmetrical in axis and has three inlet mouths, and described inlet mouth is arranged corresponding to each gas storage chamber, and is connected the room, chamber in each gas storage chamber.
Preferably, gas storage chamber adopts with upper end cover and is threaded.
Preferably, described ultrasonic atomizing nozzle adopts ring-type Lavalle structure, and this Lavalle structure shrinks the room, chamber that section is connected the 3rd gas storage chamber.
Preferably, the injection drift angle scope of ultrasonic atomizing nozzle is 30 ��-50 ��.
The present invention compares relative to prior art, has following significant advantage: 1, the present invention by adding three layers of atomization structure in nozzle arrangements, improves atomizing effect and powder delivery yield rate, it is achieved finished product powder diameter controllable. 2, by the position of up-down adjustment thrust-augmenting nozzle, and assemble different nozzles, the way selection of ultrasonic tight coupling, ultrasonic laminar flow can be realized, can be used for different metal powder, the complex optimum of implementation efficiency, energy-conservation, stability, play the advantage of various atomization technique, supply Problems existing in single atomization technique simultaneously, it is to increase the stability of aerosolization. 3, by the three of upper end cover grades of screw thread designs, it is possible to realize nozzle simplicity and change, convenient for maintaining.
Accompanying drawing explanation
Fig. 1 has removed the first gas storage chamber, the 2nd gas storage chamber and laminar flow atomizing nozzle that is connected with it, structural representation when ultrasonic atomizing nozzle is used alone close-coupled nozzle.
Fig. 2 is for after having removed the 2nd gas storage chamber and laminar flow atomizing nozzle that is connected with it, it may also be useful to structural representation during the ultrasonic combination of tight coupling.
Fig. 3 is for after having removed the first gas storage chamber and the close-coupled nozzle that is connected with it, it may also be useful to structural representation during the ultrasonic combination of laminar flow.
Fig. 4 is that the first gas storage chamber, the 2nd gas storage chamber, the 3rd gas storage chamber are connected tight coupling atomizing nozzle, laminar flow atomizing nozzle, the complete wiring layout of ultrasonic atomizing nozzle respectively.
Fig. 5 is laminar flow nozzle atomizing nozzle and thrust-augmenting nozzle end partial schematic diagram.
Wherein, 1-screw thread; 2-inlet mouth; 3-first gas storage chamber; 4-the 2nd gas storage chamber; 5-the 3rd gas storage chamber; 6-laminar flow atomizing nozzle; 7-Lavalle structure.
Embodiment
The present invention be a kind of for the preparation of 3D print metal-powder gas atomization device, this gas atomization device comprise upper end cover, through upper end cover shaft core position thrust-augmenting nozzle, be fixed on upper end cover and be symmetrical in thrust-augmenting nozzle arrange gas chamber;
Gas chamber arranges three layers from inside to outside and removable unloads gas storage chamber, is respectively the first gas storage chamber 3, the 2nd gas storage chamber 4, the 3rd gas storage chamber 5;
First gas storage chamber 3, the 2nd gas storage chamber 4, the 3rd gas storage chamber 5 are all connected to upper end cover; First gas storage chamber, the 2nd gas storage chamber, the 3rd gas storage chamber are connected tight coupling atomizing nozzle, laminar flow atomizing nozzle 6, ultrasonic atomizing nozzle respectively;
Upper end cover is symmetrical in axis and has three inlet mouths 2, and inlet mouth 2 is arranged corresponding to each gas storage chamber, and is connected the room, chamber in each gas storage chamber.
Screw thread 1 can also be adopted between gas storage chamber and upper end cover to be connected.
Ultrasonic atomizing nozzle adopts ring-type Lavalle structure 7, and this Lavalle structure shrinks the room, chamber that section is connected the 3rd gas storage chamber 5.
The injection drift angle scope of ultrasonic atomizing nozzle is 30 ��-50 ��.
The work of this device is led to into rare gas element, it is possible to the pollution of other elements in anti-oxidation or air, thus improves the purity of metal-powder. And through preheating before leading to nozzle, it is possible to significantly increase gas kinetic energy, it is achieved increase the object of gas velocity. Wherein, it is 2-5MPa that tight coupling atomizing nozzle leads to the pressure range into argon gas, and it is 1-2MPa that laminar flow atomizing nozzle leads to the pressure range into argon gas, and it is 2-5MPa that ultrasonic atomizing nozzle leads to the pressure range into argon gas.
Embodiment 1
Remove the 2nd gas storage chamber 4, the 3rd gas storage chamber 5 and the laminar flow atomizing nozzle being connected with it, ultrasonic atomizing nozzle. Only select tight coupling atomizing nozzle, prepare titanium aluminum alloy powder. The concrete working process of this aerosol device is as follows:
(1) installing tight coupling atomizing nozzle (as shown in Figure 1) on upper end cover, it is 3.5mm that adjustment thrust-augmenting nozzle stretches out atomizing gun length.
(2) titanium-aluminium alloy is belonged to test block and put into high frequency furnace, be heated to melt completely under argon gas shielded.
(3) adjusting the logical argon pressure of close-coupled nozzle is 4Mpa.
(4) open argon air valve, make argon gas be passed into the first gas storage chamber 3 by inlet mouth, after of short duration compression, spray via close-coupled nozzle. When the titanium aluminum alloy liquid of melting is flowed out by flow-guiding mouth, the argon gas penetrated from close-coupled nozzle is broken into small droplets. Small droplets subsequently drops to cooled and solidified in spray chamber and becomes powder. Wherein spray chamber first vacuumizes, then leads to and make atomization room pressure 800Pa into argon gas.
(5) last obtained titanium aluminum alloy powder, oxygen level is less than 500ppm, size distribution between 30-60 ��m, narrow diameter distribution and sphericity height.
Embodiment 2
After having removed the 2nd gas storage chamber 4 and laminar flow atomizing nozzle 6 that is connected with it, it may also be useful to tight coupling ultrasonic atomizing nozzle, prepare titanium aluminum alloy powder.
(1) installing tight coupling atomizing nozzle and ultrasonic atomizing nozzle (as shown in Figure 2) on upper end cover, ultrasonic atomizing nozzle injection drift angle is 40 ��, and it is 3.5mm that adjustment thrust-augmenting nozzle stretches out atomizing gun length.
(2) titanium-aluminium alloy is belonged to test block and put into high frequency furnace, be heated to melt completely under argon gas shielded.
(3) the logical argon pressure of close-coupled nozzle is 3Mpa, and the logical argon pressure of ultrasonic nozzle is 3Mpa.
(4) open argon air valve, make argon gas be passed into the air chamber of tight coupling atomizing nozzle and ultrasonic atomizing nozzle respectively by respective inlet mouth, after of short duration compression, spray via circular air hole place at different levels. Molten metal liquid state or alloy arrive close-coupled nozzle place through thrust-augmenting nozzle. First step atomization is in distance close-coupled nozzle exit, is dispersed as umbrella shape by the atomization air flow with HI high impact momentum, simultaneously under the effect of ultrasonic atomizatio air-flow, is broken into less drop by second annular hypersonic air flow. Small droplets subsequently drops to cooled and solidified in spray chamber and becomes powder. Wherein spray chamber first vacuumizes, then leads to and make atomization room pressure 800Pa into argon gas.
(5) finally obtaining titanium aluminum alloy powder, oxygen level is less than 500ppm, and particle diameter is less than between 20-40 ��m, narrow diameter distribution and sphericity height.
Embodiment 3
After having removed the first gas storage chamber 3 and the close-coupled nozzle that is connected with it, it may also be useful to laminar flow ultrasonic atomizing nozzle 6, prepare titanium aluminum alloy powder.
(1) installing laminar flow atomizing nozzle and ultrasonic atomizing nozzle (as shown in Figure 3) on upper end cover, ultrasonic atomizing nozzle injection drift angle is 35 ��, coincide along with laminar flow atomizing nozzle end under adjustment thrust-augmenting nozzle.
(2) titanium-aluminium alloy is belonged to test block and put into high frequency furnace, be heated to melt completely under argon gas shielded.
(3) the logical argon pressure of laminar flow nozzle is 2Mpa, and the logical argon pressure of ultrasonic nozzle is 3Mpa.
(4) open argon air valve, make argon gas be passed into the air chamber of tight coupling atomizing nozzle and ultrasonic atomizing nozzle respectively by respective inlet mouth. The pore shape of laminar flow nozzle part and thrust-augmenting nozzle end tangent (such as Fig. 5) in the nozzle of laminar flow atomization, make at liquid stream when by nozzle, liquid flow path direction is consistent with air flow line, when liquid stream and air-flow are when spraying through nozzle, pressure is discharged, external pressure is diminished suddenly, liquid stream is fragmented into minimum drop. The air-flow of ultrasonic atomizing nozzle focuses on point below laminar flow atomizing nozzle simultaneously, and now drop does not have enough time to solidify, it is possible to the further refinement of the drop making particle diameter bigger. Wherein spray chamber first vacuumizes, then leads to and make atomization room pressure be 800Pa into argon gas.
(5) finally obtained titanium aluminum alloy powder, oxygen level is less than 500ppm, and particle diameter is less than between 10-30 ��m, narrow diameter distribution and sphericity height.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610162837.5A CN105618773B (en) | 2016-03-21 | 2016-03-21 | A kind of gas atomization device being used to prepare 3D printing metal powder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610162837.5A CN105618773B (en) | 2016-03-21 | 2016-03-21 | A kind of gas atomization device being used to prepare 3D printing metal powder |
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| CN105618773A true CN105618773A (en) | 2016-06-01 |
| CN105618773B CN105618773B (en) | 2019-01-04 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106378461A (en) * | 2016-11-21 | 2017-02-08 | 华南理工大学 | Double-nozzle atomizing device and method for preparing 3D printing spherical metal powder |
| CN106540827A (en) * | 2016-10-31 | 2017-03-29 | 安庆市长虹化工有限公司 | A kind of preparation facilitiess and method of dehydrogenation |
| CN106735273A (en) * | 2017-02-14 | 2017-05-31 | 上海材料研究所 | A kind of precinct laser fusion shaping Inconel718 Co-based alloy powders and preparation method thereof |
| CN106735268A (en) * | 2016-12-16 | 2017-05-31 | 南通金源智能技术有限公司 | Preparation method for reducing the 3D printing metal powder material of hollow powder |
| CN108941585A (en) * | 2018-06-27 | 2018-12-07 | 绵阳西磁科技有限公司 | The preparation method of 3D printing and soft magnetism patch integrated component submicron metal |
| EP3689512A1 (en) * | 2019-02-04 | 2020-08-05 | Mitsubishi Hitachi Power Systems, Ltd. | Metal powder producing apparatus and gas jet device for same |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106540827A (en) * | 2016-10-31 | 2017-03-29 | 安庆市长虹化工有限公司 | A kind of preparation facilitiess and method of dehydrogenation |
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| CN106378461B (en) * | 2016-11-21 | 2019-01-29 | 华南理工大学 | A kind of two-nozzle atomization device and method preparing 3D printing globular metallic powder |
| CN106735268A (en) * | 2016-12-16 | 2017-05-31 | 南通金源智能技术有限公司 | Preparation method for reducing the 3D printing metal powder material of hollow powder |
| CN106735273A (en) * | 2017-02-14 | 2017-05-31 | 上海材料研究所 | A kind of precinct laser fusion shaping Inconel718 Co-based alloy powders and preparation method thereof |
| CN108941585A (en) * | 2018-06-27 | 2018-12-07 | 绵阳西磁科技有限公司 | The preparation method of 3D printing and soft magnetism patch integrated component submicron metal |
| EP3689512A1 (en) * | 2019-02-04 | 2020-08-05 | Mitsubishi Hitachi Power Systems, Ltd. | Metal powder producing apparatus and gas jet device for same |
| CN112533712A (en) * | 2019-02-04 | 2021-03-19 | 三菱动力株式会社 | Metal powder manufacturing apparatus and gas injector thereof |
| US11298746B2 (en) | 2019-02-04 | 2022-04-12 | Mitsubishi Power, Ltd. | Metal powder producing apparatus and gas jet device for same |
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