JPH04325606A - Production of metal powder - Google Patents
Production of metal powderInfo
- Publication number
- JPH04325606A JPH04325606A JP9752791A JP9752791A JPH04325606A JP H04325606 A JPH04325606 A JP H04325606A JP 9752791 A JP9752791 A JP 9752791A JP 9752791 A JP9752791 A JP 9752791A JP H04325606 A JPH04325606 A JP H04325606A
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- cooling liquid
- liquid layer
- metal powder
- injected
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 85
- 239000002184 metal Substances 0.000 title claims abstract description 85
- 239000000843 powder Substances 0.000 title claims abstract description 43
- 238000004519 manufacturing process Methods 0.000 title claims description 15
- 238000001816 cooling Methods 0.000 claims abstract description 16
- 239000000110 cooling liquid Substances 0.000 claims description 50
- 239000002826 coolant Substances 0.000 abstract description 20
- 239000011261 inert gas Substances 0.000 abstract description 18
- 230000003647 oxidation Effects 0.000 abstract description 4
- 238000007254 oxidation reaction Methods 0.000 abstract description 4
- 238000002347 injection Methods 0.000 description 22
- 239000007924 injection Substances 0.000 description 22
- 239000007788 liquid Substances 0.000 description 12
- 230000002093 peripheral effect Effects 0.000 description 12
- 238000000034 method Methods 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000010408 film Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000010301 surface-oxidation reaction Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 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
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、溶融金属を旋回移動す
る冷却液層中に供給して金属粉末を製造する方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing metal powder by supplying molten metal into a rotating cooling liquid layer.
【０００２】0002
【従来の技術】急冷凝固金属粉末は、結晶粒が微細で合
金元素も過飽和に含有させることができるので、例えば
アルミニウムやその合金の急冷凝固粉末によって形成さ
れた押出材は、溶製材では具備することのない優れた材
質特性を有し、機械部品等の素材として注目されている
。[Prior Art] Rapidly solidified metal powder has fine crystal grains and can contain supersaturated alloying elements. For example, an extruded material formed from rapidly solidified powder of aluminum or its alloy has It has exceptional material properties and is attracting attention as a material for mechanical parts.
【０００３】前記急冷凝固金属粉末の好適な製造方法と
して、回転ドラム法がある。この方法は、図２に示すよ
うに、回転する冷却ドラム６１の内周面に冷却液層６２
を遠心力の作用で形成し、該冷却液層６２に溶融金属を
噴射し、微細に分断して急冷凝固した金属粉末を得る方
法である。同図において、６３は溶融金属供給容器とし
ての噴射るつぼであり、その外周面には加熱用の高周波
コイル６４が装着され、その下部側壁には噴射ノズル６
５が開設されている。前記るつぼ６３内の溶融金属６６
は、該るつぼ６３に不活性ガス６７を加圧注入すること
によって前記ノズル６５から噴射される。そして、冷却
ドラム６１内の金属粉末は、一定量溜まると、冷却ドラ
ム６１の回転を止め、冷却液と共に回収され、脱液後、
乾燥される。かかる金属粉末の製造方法は特公平 １−
４９７６９ 号公報に開示されている。[0003] A preferred method for producing the rapidly solidified metal powder is a rotating drum method. In this method, as shown in FIG. 2, a cooling liquid layer 62 is formed on the inner peripheral surface of a rotating cooling drum 61.
In this method, a molten metal is formed by the action of centrifugal force, and molten metal is injected into the cooling liquid layer 62 to obtain finely divided metal powder that is rapidly solidified. In the figure, 63 is an injection crucible serving as a molten metal supply container, a high frequency coil 64 for heating is attached to the outer peripheral surface of the crucible, and an injection nozzle 6 is attached to the lower side wall of the crucible.
5 have been established. Molten metal 66 in the crucible 63
is injected from the nozzle 65 by injecting an inert gas 67 into the crucible 63 under pressure. When a certain amount of metal powder accumulates in the cooling drum 61, the rotation of the cooling drum 61 is stopped and the metal powder is collected together with the cooling liquid.
dried. The method for manufacturing such metal powder is disclosed in the Japanese Patent Publication No. 1-
It is disclosed in Japanese Patent No. 49769.
【０００４】0004
【発明が解決しようとする課題】しかしながら、回転ド
ラム法では、いわゆるバッチ式操業となり、生産性が劣
る。そのうえ、粉末回収時に溶融金属の噴射を止めなけ
ればならないため、ノズルに孔詰まりが生じ易いという
問題がある。また、冷却温度を一定にするためには、冷
却液層の液面より冷却液を供給、排出して温度制御しな
ければならないが、この際、液面が乱れ、粉末粒度や品
質にばらつきが生じ易いという問題がある。However, the rotating drum method involves a so-called batch operation, resulting in poor productivity. Furthermore, since the injection of molten metal must be stopped during powder recovery, there is a problem in that the nozzle is likely to become clogged. In addition, in order to keep the cooling temperature constant, the temperature must be controlled by supplying and discharging the cooling liquid from the liquid level of the cooling liquid layer, but in this case, the liquid level is disturbed and the powder particle size and quality may vary. There is a problem in that it is easy to occur.
【０００５】また、溶融金属が噴射された後、冷却液層
に至るまでにその表面が酸化し、酸化膜が形成されるた
め、冷却液層による分断が困難となり、又金属粉末の酸
素や水素含有量が増加し、品質劣化を招来する。本発明
は、安定した品質の金属粉末を連続的に製造することが
でき、しかも酸化膜の生成を抑制することができる金属
粉末の製造方法を提供することを目的とする。In addition, after the molten metal is injected, its surface becomes oxidized and an oxide film is formed before it reaches the cooling liquid layer, making it difficult to separate the metal powder by the cooling liquid layer, and the oxygen and hydrogen of the metal powder. The content increases, leading to quality deterioration. SUMMARY OF THE INVENTION An object of the present invention is to provide a method for producing metal powder that can continuously produce metal powder of stable quality and suppress the formation of an oxide film.
【０００６】[0006]
【課題を解決するための手段】本発明の金属粉末の製造
方法は、冷却用筒体の内周面に沿って旋回しながら流下
する冷却液層を形成し、該冷却液層の内周面側より溶融
金属を噴射し、噴射した溶融金属を不活性ガスによって
包囲しながら冷却液層に供給し、該溶融金属を冷却液層
によって分断し冷却凝固させて金属粉末を得ることを発
明の構成とするものである。溶融金属の供給に際しては
、溶融金属供給容器に不活性ガス等の圧媒を供給して容
器内の溶融金属をノズル孔から噴射供給してもよく、又
容器内の溶融金属の自重によりノズル孔から噴射 （噴
出） 供給してもよい。[Means for Solving the Problems] The method for producing metal powder of the present invention forms a cooling liquid layer that flows down while swirling along the inner peripheral surface of a cooling cylinder, and The structure of the invention is to inject molten metal from the side, supply the injected molten metal to a cooling liquid layer while surrounding it with an inert gas, and obtain metal powder by dividing the molten metal by the cooling liquid layer and cooling and solidifying it. That is. When supplying molten metal, a pressure medium such as an inert gas may be supplied to the molten metal supply container, and the molten metal in the container may be injected and supplied from the nozzle hole. It may also be supplied by injection (spout).
【０００７】[0007]
【作用】冷却用筒体の内周面に沿って供給された冷却液
は、筒体内周面に沿って旋回しながら流下し、旋回時の
遠心力の作用でほぼ一定内径の冷却液層を形成する。こ
の冷却液層の内側より溶融金属を供給すると、溶融金属
流又は溶滴は旋回流により分断されると共に冷却凝固さ
れ、粉末となる。[Operation] The coolant supplied along the inner circumferential surface of the cooling cylinder flows down while swirling along the inner circumferential surface of the cylinder, and due to the action of centrifugal force during swirling, a coolant layer with an approximately constant inner diameter is created. Form. When molten metal is supplied from inside this cooling liquid layer, the molten metal flow or droplets are divided by the swirling flow and are cooled and solidified to become powder.
【０００８】この際、冷却液層は常に新たに供給される
冷却液によって形成されるために一定の温度が容易に維
持される。このため、温度制御のために液面より冷却液
を排出、供給する必要がなく、液面に乱れは生じず、安
定した状態が維持される。それ故、冷却液層に供給され
た溶融金属は常に一定状態の下で冷却液層中に注入、分
断され、一定温度の下で冷却凝固されるため、金属粉末
の品質が安定する。[0008] At this time, since the cooling liquid layer is always formed by newly supplied cooling liquid, a constant temperature can be easily maintained. Therefore, there is no need to drain or supply cooling liquid from the liquid surface for temperature control, and the liquid level is not disturbed and a stable state is maintained. Therefore, the molten metal supplied to the cooling liquid layer is always injected into the cooling liquid layer under constant conditions, is divided, and is cooled and solidified at a constant temperature, so that the quality of the metal powder is stabilized.
【０００９】冷却液層中の金属粉末は冷却液と共に旋回
しながら流下し、筒体の下端より排出されるので、金属
粉末の連続生産が可能となる。また、溶融金属は冷却液
層に供給されるまでの間、不活性ガスによって包囲され
ているので、この間において溶融金属の表面酸化が抑制
され、冷却液層による分断が速やかに行われ、また酸化
膜の薄い高品質の粉末が得られる。Since the metal powder in the cooling liquid layer flows down while swirling together with the cooling liquid and is discharged from the lower end of the cylinder, continuous production of metal powder becomes possible. In addition, since the molten metal is surrounded by an inert gas until it is supplied to the cooling liquid layer, surface oxidation of the molten metal is suppressed during this time, and the cooling liquid layer quickly divides the molten metal. A high quality powder with a thin film is obtained.
【００１０】0010
【実施例】まず、本発明の金属粉末製造方法を実施する
ための装置について説明する。図１は実施例に係る金属
粉末製造装置を示しており、内周面に冷却液層２１を形
成するための冷却用筒体１ と、冷却液層２１に溶融金
属２２を噴射供給するための供給容器である噴射るつぼ
２ と、前記筒体１ に冷却液を供給するための手段で
あるポンプ３ を備えている。EXAMPLES First, an apparatus for carrying out the method for producing metal powder of the present invention will be described. FIG. 1 shows a metal powder manufacturing apparatus according to an embodiment, which includes a cooling cylinder 1 for forming a cooling liquid layer 21 on the inner peripheral surface, and a cooling cylinder 1 for injecting and supplying molten metal 22 to the cooling liquid layer 21. It is equipped with an injection crucible 2 which is a supply container, and a pump 3 which is a means for supplying cooling liquid to the cylinder body 1.
【００１１】前記筒体１ は、円筒形状であり、その上
端には、溶融金属を冷却液層２１に供給するための開口
４ が中心部に形成された蓋体５ が被着されている。
下部内周面には冷却液層２１の層厚調整用リング６ が
ボルトによって着脱、交換自在に取り付けられている。
上部には冷却液噴出管７ の吐出口８ が筒体内周面に
接線方向から等間隔で複数箇所開口しており、該噴出管
７ の管軸方向は筒体軸心に直交する平面に対して ０
〜２０゜程度斜め下方に設定されている。筒体１ の下
端には液切り用部材として円筒状の網体９ が連設され
ており、該網体９ の下端には、粉末回収用の漏斗体１
０が取り付けられており、網体９ の回りにはカバー１
１が設けられている。尚、層厚調整用リング６ は、図
例では断面方形状であるが、リングの上面の外周縁から
下面の内周縁にかけて漸次縮径する流線形の曲面で形成
してもよい。The cylinder 1 has a cylindrical shape, and a lid 5 having an opening 4 formed in the center for supplying molten metal to a cooling liquid layer 21 is attached to its upper end. A ring 6 for adjusting the layer thickness of the cooling liquid layer 21 is attached to the lower inner circumferential surface with bolts so as to be detachable and replaceable. In the upper part, a plurality of discharge ports 8 of a coolant jet pipe 7 are opened at equal intervals from a tangential direction to the inner peripheral surface of the cylinder, and the pipe axis direction of the jet pipe 7 is perpendicular to the plane perpendicular to the cylinder axis. Te 0
It is set diagonally downward by ~20 degrees. A cylindrical net 9 is connected to the lower end of the cylinder 1 as a liquid draining member, and a funnel 1 for collecting powder is attached to the lower end of the net 9.
0 is attached, and a cover 1 is placed around the net 9.
1 is provided. Although the layer thickness adjustment ring 6 has a rectangular cross section in the illustrated example, it may be formed with a streamlined curved surface whose diameter gradually decreases from the outer circumferential edge of the upper surface to the inner circumferential edge of the lower surface.
【００１２】前記冷却液噴出管７ は、ポンプ３ を介
してタンク１２に配管接続されている。また、前記カバ
ー１１の底部はタンク１２に配管されており、カバー１
１によって回収された冷却液はタンク１２に戻され、循
環使用される。
尚、タンク１２には、図示省略の補給用の冷却液供給管
が設けられ、またタンク内や循環流路の途中に冷却器を
適宜介在させてもよい。冷却液としては一般に水が使用
されるが、油が使用される場合もある。尚、水を用いる
場合、水中の酸素を除去したものを使用するのが望まし
い。酸素の除去装置は市販されており、入手容易である
。The coolant jetting pipe 7 is connected to a tank 12 via a pump 3. Further, the bottom of the cover 11 is piped to a tank 12, and the cover 11 is connected to a tank 12.
The coolant recovered by 1 is returned to the tank 12 and used for circulation. The tank 12 is provided with a cooling liquid supply pipe for replenishment (not shown), and a cooler may be appropriately interposed within the tank or in the middle of the circulation flow path. Water is generally used as the coolant, but oil may also be used. In addition, when using water, it is desirable to use water from which oxygen has been removed. Oxygen removal devices are commercially available and easy to obtain.
【００１３】前記蓋体５ の上部には、溶融金属供給容
器としての噴射るつぼ２ が鉛直方向に対して傾斜して
設けられており、その外周には加熱用誘導コイル１４が
巻回形成され、その底部にはノズル孔１５が開設されて
いる。噴射るつぼ２ は黒鉛や窒化珪素等の耐火物で形
成されており、前記コイル１４を覆うようにカバー１６
が付設され、その下面にはノズル孔１５の噴射方向に沿
って冷却液層２１の近傍まで導管１７が延設されており
、カバー１６上部にはＡｒ やＮ２ 等の不活性ガスを
カバー１６内に供給するための供給管１８が設けられて
いる。一方、噴射るつぼ２ の上蓋１９にはＡｒ やＮ
２ 等の不活性ガスの圧媒や圧送された溶融金属を注入
するための注入孔２０が設けられている。[0013] An injection crucible 2 serving as a molten metal supply container is provided on the upper part of the lid 5 , inclined with respect to the vertical direction, and a heating induction coil 14 is wound around the outer circumference of the crucible 2 . A nozzle hole 15 is provided at its bottom. The injection crucible 2 is made of a refractory material such as graphite or silicon nitride, and has a cover 16 covering the coil 14.
A conduit 17 is provided on the lower surface of the nozzle hole 15 to extend near the cooling liquid layer 21 along the injection direction of the nozzle hole 15, and an inert gas such as Ar or N2 is injected into the cover 16 at the upper part of the cover 16. A supply pipe 18 is provided for supplying. On the other hand, the upper lid 19 of the injection crucible 2 is filled with Ar and N.
An injection hole 20 is provided for injecting a pressure medium of an inert gas such as No. 2 or the like or a pressurized molten metal.
【００１４】本発明を実施するには、ポンプ３ を作動
させて、筒体１ の内周面に高速旋回しながら流下する
冷却液層２１を形成する。すなわち、筒体１ の内周面
に沿って冷却液噴出管７ より噴出された冷却液は、筒
体１ の内周面に沿って旋回しながら流下し、層厚調整
用リング６ をオーバーフローして下方へ流出する。こ
の際、冷却液は流下速度が押えれると共に旋回時の遠心
力の作用で前記リング６ の上方においてほぼ一定内径
の冷却液層２１が容易に形成される。To carry out the present invention, the pump 3 is operated to form a cooling liquid layer 21 flowing down on the inner peripheral surface of the cylinder 1 while swirling at high speed. That is, the coolant jetted from the coolant jet pipe 7 along the inner peripheral surface of the cylinder 1 flows down while swirling along the inner peripheral surface of the cylinder 1, and overflows the layer thickness adjustment ring 6. and flows downward. At this time, the flow rate of the coolant is suppressed, and a coolant layer 21 having a substantially constant inner diameter is easily formed above the ring 6 due to the action of centrifugal force during the rotation.
【００１５】該冷却液層２１は、常に新たに供給される
冷却液によって形成されるため、一定の温度が容易に維
持される。従って、温度制御のために液面より冷却液を
供給、排出する必要がなく、液面に乱れが生じにくく、
安定性に優れる。次に、噴射るつぼ２ のカバー１６内
に不活性ガスを供給し、導管１７よりガスを排出すると
共に、噴射るつぼ２ 内に圧媒や溶融金属を圧送して、
るつぼ２ 内の溶融金属２２をノズル孔１５より噴射す
る。噴射された溶融金属流もしくは溶滴は、導管１７の
中を不活性ガスに包まれた状態で冷却液層２１に供給さ
れ、旋回流によって分断され、急冷凝固され、金属粉末
が連続的に生産される。この粉末は、噴射された溶融金
属が冷却液層２１に注入されるまでの間、不活性ガスに
包囲されて酸化が防止され、又温度や液面状態が安定な
冷却液層によって粉化されるので、酸化膜が薄く、品質
の安定性に優れる。
尚、噴射るつぼ２ の外周面および加熱用誘導コイル１
４は、カバー１６内に注入された不活性ガスに覆われる
ため、酸化防止が図られ、耐久性が向上する。Since the cooling liquid layer 21 is formed by constantly newly supplied cooling liquid, a constant temperature can be easily maintained. Therefore, there is no need to supply or discharge cooling liquid from the liquid level for temperature control, and the liquid level is less likely to be disturbed.
Excellent stability. Next, an inert gas is supplied into the cover 16 of the injection crucible 2, and the gas is discharged from the conduit 17, and a pressure medium and molten metal are pumped into the injection crucible 2.
The molten metal 22 in the crucible 2 is injected from the nozzle hole 15. The injected molten metal stream or droplets are supplied to the cooling liquid layer 21 while being surrounded by an inert gas through the conduit 17, divided by the swirling flow, and rapidly solidified to continuously produce metal powder. be done. Until the injected molten metal is injected into the cooling liquid layer 21, this powder is surrounded by an inert gas to prevent oxidation, and is pulverized by the cooling liquid layer whose temperature and liquid level are stable. Because of this, the oxide film is thin and the quality is stable. In addition, the outer peripheral surface of the injection crucible 2 and the heating induction coil 1
4 is covered with inert gas injected into the cover 16, thereby preventing oxidation and improving durability.
【００１６】冷却液層２１中の金属粉末は、冷却液と共
に旋回しながら層厚調整用リング６ を越えて流下し、
筒体１ の下端より液切り用網体９ に入る。ここで、
冷却液は遠心力の作用で網体９ より放射状に外方へ飛
散排出され、一次的に脱液される液分の少ない金属粉末
が得られる。前記網体９ により一次脱液され、漏斗体
１０から排出された金属粉末は、液分が少ないので、順
次遠心分離機等の適宜の脱液装置にかけることにより短
時間で液分がほとんどなくなり、容易に乾燥され、製品
粉末となる。The metal powder in the cooling liquid layer 21 flows down over the layer thickness adjustment ring 6 while swirling together with the cooling liquid.
It enters the liquid draining net 9 from the lower end of the cylinder 1 . here,
The cooling liquid is scattered and discharged radially outward from the mesh body 9 by the action of centrifugal force, and metal powder with a small liquid content is obtained which is primarily removed. Since the metal powder that has been primarily deliquified by the mesh body 9 and discharged from the funnel body 10 has a small liquid content, it is sequentially passed through an appropriate deliquid device such as a centrifugal separator so that the liquid content is almost completely removed in a short time. It is easily dried and becomes a product powder.
【００１７】上記実施例では、冷却用筒体として円筒状
のものを示したが、これに限らず、例えば内周面が上拡
き回転放物面で形成された漏斗形状や切頭逆円錐形状と
してもよい。この場合、層厚調整用フランジを取付けな
くても、一定内径の冷却液層を形成することができる。
また、上記実施例においては、噴射るつぼ２ 内の溶融
金属２２は、圧媒を作用させて加圧することによりノズ
ル孔１５から噴射したが、圧媒を作用させることなく、
溶融金属２２自体に作用する重力 （自重） により噴
射るつぼ２ 内の下部の溶融金属を加圧状態とし、ノズ
ル孔１５から噴射 （噴出） してもよい。この場合、
筒体１の軸心を鉛直方向に対して傾斜させ、噴射るつぼ
２ の軸心を鉛直方向とし、重力落下する溶融金属を筒
体内周面に形成された冷却液層に供給してもよい。In the above embodiment, a cylindrical cooling cylinder is shown, but the cooling cylinder is not limited to this, for example, a funnel shape whose inner circumferential surface is an upwardly expanding paraboloid of revolution, or a truncated inverted circular cone can be used. It may also be a shape. In this case, a cooling liquid layer with a constant inner diameter can be formed without attaching a layer thickness adjustment flange. Further, in the above embodiment, the molten metal 22 in the injection crucible 2 was injected from the nozzle hole 15 by pressurizing it by applying a pressure medium, but without applying a pressure medium,
The molten metal in the lower part of the injection crucible 2 may be pressurized by gravity (self-weight) acting on the molten metal 22 itself, and may be injected (spouted) from the nozzle hole 15. in this case,
The axis of the cylinder 1 may be inclined with respect to the vertical direction, the axis of the injection crucible 2 may be set vertically, and the molten metal falling by gravity may be supplied to a cooling liquid layer formed on the circumferential surface of the cylinder.
【００１８】また、噴射るつぼ２ のノズル孔１５から
噴射された溶融金属を不活性ガスで包囲するには、図２
のように、噴射るつぼ２ の底部に穿設したノズル孔１
５の周りから不活性ガスを噴射するためのスリットノズ
ル３１を開設してもよい。３２は環状の保気室であり、
不活性ガス供給孔３３が連通している。尚、本発明は、
Ａｌ 合金やＭｇ 合金等の軽量金属粉末の製造に限ら
ず、鉄やその合金等の金属粉末の製造に適用できること
は勿論である。Furthermore, in order to surround the molten metal injected from the nozzle hole 15 of the injection crucible 2 with an inert gas, the method shown in FIG.
Nozzle hole 1 drilled at the bottom of injection crucible 2 as shown in
A slit nozzle 31 for injecting inert gas from around 5 may be provided. 32 is an annular air retention chamber;
An inert gas supply hole 33 is in communication. In addition, the present invention
Of course, the present invention is applicable not only to the production of lightweight metal powders such as Al alloys and Mg alloys, but also to the production of metal powders such as iron and its alloys.
【００１９】[0019]
【発明の効果】以上説明した通り、本発明の金属粉末の
製造方法によると、筒体の内周面に沿って冷却液を噴出
供給して、筒体内周面に沿って旋回しながら流下する冷
却液層を形成するので、溶融金属が供給される冷却液層
の内周面は安定し、温度も均一に保持される。そして、
該冷却液層中に溶融金属を供給するので、品質の安定し
た急冷凝固粉末が連続的に生産され、噴射ノズル孔詰り
も生じない。[Effects of the Invention] As explained above, according to the method for producing metal powder of the present invention, the cooling liquid is jetted and supplied along the inner peripheral surface of the cylinder, and flows down while swirling along the inner peripheral surface of the cylinder. Since a cooling liquid layer is formed, the inner peripheral surface of the cooling liquid layer to which molten metal is supplied is stabilized and the temperature is maintained uniformly. and,
Since molten metal is supplied into the cooling liquid layer, rapidly solidified powder of stable quality is continuously produced, and injection nozzle holes are not clogged.
【００２０】また、溶融金属は、不活性ガスに包囲され
た状態で冷却液層に供給されるため、冷却液層に至るま
での間における溶融金属の表面酸化が抑制され、粉化が
速やかに行われ、又酸素や水素含有量の少ない高品質の
金属粉末が得られる。[0020] Furthermore, since the molten metal is supplied to the cooling liquid layer while being surrounded by an inert gas, surface oxidation of the molten metal before reaching the cooling liquid layer is suppressed, and pulverization is quickly achieved. high quality metal powder with low oxygen and hydrogen content.
【図１】本発明を実施するための金属粉末製造装置の要
部断面全体配置図である。FIG. 1 is a cross-sectional overall layout diagram of main parts of a metal powder manufacturing apparatus for carrying out the present invention.
【図２】不活性ガス噴射用スリットノズルを備えた噴射
るつぼの断面図である。FIG. 2 is a sectional view of an injection crucible equipped with a slit nozzle for inert gas injection.
【図３】従来の金属粉末製造装置の要部断面図である。FIG. 3 is a sectional view of a main part of a conventional metal powder manufacturing apparatus.
１ 冷却用筒体
２ 噴射るつぼ （溶融金属供給容器）３ ポンプ
（冷却液供給手段）
７ 冷却液噴出管
１５ ノズル孔
１７ 不活性ガス排出用導管
２１ 冷却液層
２２ 溶融金属1 Cooling cylinder 2 Injection crucible (molten metal supply container) 3 Pump (coolant supply means) 7 Coolant jet pipe 15 Nozzle hole 17 Inert gas discharge conduit 21 Coolant layer 22 Molten metal
Claims (2)
がら流下する冷却液層を形成し、該冷却液層の内周面側
より溶融金属を噴射し、噴射した溶融金属を不活性ガス
によって包囲しながら冷却液層に供給し、該溶融金属を
冷却液層によって分断し冷却凝固させて金属粉末を得る
ことを特徴とする金属粉末の製造方法。Claim 1: Forming a cooling liquid layer that flows downward while swirling along the inner circumferential surface of a cooling cylinder, injecting molten metal from the inner circumferential side of the cooling liquid layer, and disintegrating the injected molten metal. A method for producing metal powder, which comprises supplying the molten metal to a cooling liquid layer while being surrounded by an active gas, dividing the molten metal by the cooling liquid layer, and cooling and solidifying the molten metal to obtain metal powder.
金属を自重により該容器下部に開設されたノズル孔より
噴射する請求項１の金属粉末の製造方法。2. The method for producing metal powder according to claim 1, wherein the molten metal contained in the molten metal supply container is injected by its own weight from a nozzle hole provided at the bottom of the container.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9752791A JP2672035B2 (en) | 1991-04-26 | 1991-04-26 | Method and apparatus for producing metal powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9752791A JP2672035B2 (en) | 1991-04-26 | 1991-04-26 | Method and apparatus for producing metal powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04325606A true JPH04325606A (en) | 1992-11-16 |
| JP2672035B2 JP2672035B2 (en) | 1997-11-05 |
Family
ID=14194726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9752791A Expired - Lifetime JP2672035B2 (en) | 1991-04-26 | 1991-04-26 | Method and apparatus for producing metal powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2672035B2 (en) |
-
1991
- 1991-04-26 JP JP9752791A patent/JP2672035B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2672035B2 (en) | 1997-11-05 |
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