JPH0559411A - Production of metal powder - Google Patents
Production of metal powderInfo
- Publication number
- JPH0559411A JPH0559411A JP3219008A JP21900891A JPH0559411A JP H0559411 A JPH0559411 A JP H0559411A JP 3219008 A JP3219008 A JP 3219008A JP 21900891 A JP21900891 A JP 21900891A JP H0559411 A JPH0559411 A JP H0559411A
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- molten metal
- tip
- gas
- melt
- 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
- 239000002184 metal Substances 0.000 title claims abstract description 81
- 239000000843 powder Substances 0.000 title claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 230000002093 peripheral effect Effects 0.000 claims abstract description 23
- 239000000155 melt Substances 0.000 claims description 21
- 238000010298 pulverizing process Methods 0.000 claims description 10
- 239000007921 spray Substances 0.000 claims description 10
- 230000000630 rising effect Effects 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 abstract description 9
- 238000009826 distribution Methods 0.000 abstract description 5
- 229910001111 Fine metal Inorganic materials 0.000 abstract description 2
- 230000001174 ascending effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 8
- 238000009689 gas atomisation Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000000889 atomisation Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000007712 rapid solidification Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000007751 thermal spraying Methods 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
- 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
- B22F2009/088—Fluid nozzles, e.g. angle, distance
Landscapes
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はガスアトマイズ法による
金属粉末の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing metal powder by a gas atomizing method.
【０００２】[0002]
【従来の技術】ガスアトマイズ法は、耐火物製の溶湯ノ
ズルから金属溶湯を細流状に流下させ、その溶湯流に対
して噴射ノズルより高速で噴射された噴霧ガスのジェッ
トを衝突させ、溶湯流を連続的に粉化して、金属粉末を
大量に製造する方法である。近年、急冷凝固による品質
向上、溶射用粉末等に対する要求から、微粉末が要望さ
れている。微粉化の好適な手段としては、特開昭60−21
1002号公報に開示されているアトマイズ方法がある。こ
の方法は図５に示すように、溶湯ノズル21の先端部22を
逆円錐形状に形成し、そのノズル孔23の出口部24の近傍
周囲にガスジェットの噴射口25を設け、溶湯ノズル21の
先端部外周側面に沿ってジェットを噴射し、溶湯ノズル
21から金属溶湯が流出すると同時に粉化する方法であ
る。かかる方法によると、ジェットの粉化エネルギーの
伝達効率が高くまたジェットの噴射口に溶滴の沈着が生
じにくいため、微粉化が達成される。2. Description of the Related Art In the gas atomizing method, a molten metal nozzle is made to flow in a fine stream from a refractory molten metal nozzle, and a jet of atomizing gas jetted at a high speed from an injection nozzle collides against the molten metal stream to form a molten metal stream. It is a method of continuously pulverizing and producing a large amount of metal powder. In recent years, fine powder has been demanded from the demand for quality improvement by rapid solidification and powder for thermal spraying. As a suitable means for pulverization, JP-A-60-21
There is an atomizing method disclosed in Japanese Patent No. 1002. In this method, as shown in FIG. 5, the tip portion 22 of the molten metal nozzle 21 is formed in an inverted conical shape, and a gas jet injection port 25 is provided in the vicinity of an outlet portion 24 of the nozzle hole 23 of the molten metal nozzle 21. A jet is jetted along the outer peripheral surface of the tip, and the molten metal nozzle
This is a method in which molten metal flows out from 21 and is powdered at the same time. According to such a method, the atomization energy of the jet is highly transmitted, and the deposition of droplets is less likely to occur at the jet injection port, so that atomization is achieved.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、溶湯ノ
ズル21の先端部22がノズル孔23に対して鋭角状に形成さ
れているため、噴霧ガスのジェットによる冷却作用が著
しく、ノズル孔出口部24において孔詰りが生じ易い。特
に、1000℃を越える高融点金属に対して、ガス圧を高く
してアトマイズする場合、この傾向が著しい。However, since the tip portion 22 of the molten metal nozzle 21 is formed in an acute angle with respect to the nozzle hole 23, the cooling action by the jet of the spray gas is remarkable, and the nozzle hole outlet portion 24 has Clogging easily occurs. This tendency is particularly remarkable when the gas pressure is increased and atomization is performed on a high melting point metal having a temperature of over 1000 ° C.
【０００４】また、ジェットの噴射口の開口面積が小さ
いため、ジェットによる溶湯流の粉砕効果が柱状溶湯流
の中心部と外周部とで異なるため、生成粉末の粒度分布
幅が大きくなるという問題がある。本発明はかかる問題
に鑑みなされたもので、溶湯ノズルに孔詰りが生じにく
く、かつ粒度分布の狭い金属微粉末を製造することがで
きる方法を提供することを目的とする。Further, since the opening area of the jet outlet of the jet is small, the pulverizing effect of the molten metal flow by the jet is different between the central part and the outer peripheral part of the columnar molten metal flow, and the particle size distribution width of the produced powder becomes large. is there. The present invention has been made in view of the above problems, and an object of the present invention is to provide a method capable of producing a fine metal powder having a narrow particle size distribution, in which the molten metal nozzle is unlikely to be clogged.
【０００５】[0005]
【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、溶湯ノズルのノズル孔より流出した金属溶湯に
噴霧ガスのジェットを衝突させて金属溶湯を粉化し金属
粉末を製造する方法において、溶湯ノズルの先端部外周
側面を溶湯ノズルの中心線を対称軸とする截頭逆円錐曲
面で形成し、複数本の線状ジェットを前記側面に沿って
かつ前記曲面の母線からずれた方向に噴出させ、溶湯ノ
ズル先端面の中心部に開口した溶湯ノズル孔から流出し
た金属溶湯に前記ジェットの交差域において発生した噴
霧ガスの上昇流を吹き付け、金属溶湯を溶湯ノズル先端
面上を放射方向に膜状に流動させ、ノズル先端面の周縁
において該膜状流に溶湯ノズルの先端部外周側面に沿っ
て噴出したジェットを衝突させる。The method for producing a metal powder according to the present invention is a method for producing a metal powder by pulverizing a metal melt by colliding a jet of spraying gas with the metal melt flowing out from a nozzle hole of a melt nozzle. , The tip outer peripheral side surface of the melt nozzle is formed by a truncated conical curved surface with the center line of the melt nozzle as an axis of symmetry, and a plurality of linear jets are arranged along the side surface and in a direction displaced from the generatrix of the curved surface. The rising flow of the atomizing gas generated at the intersection area of the jets is blown to the molten metal flowing out from the molten metal nozzle hole opened at the center of the molten metal nozzle tip surface, and the molten metal is radiated on the molten metal nozzle tip surface in the radial direction. It is made to flow in a film shape, and a jet ejected along the outer peripheral side surface of the tip portion of the molten metal nozzle collides with the film flow at the peripheral edge of the nozzle tip surface.
【０００６】[0006]
【作用】溶湯ノズルの先端部外周側面を溶湯ノズルの中
心線を対称軸とする截頭逆円錐曲面で形成し、前記側面
に沿って複数本の線状ジェットを噴出し、溶湯ノズルの
先端面の中心部に開口した溶湯ノズル孔より金属溶湯を
流出するので、噴霧ガスのジェットがノズル孔出口部を
直接冷却しないため、溶湯ノズル孔を流出する溶湯の冷
却が防止され、高融点金属であっても孔詰りが生じにく
い。[Function] The outer peripheral side surface of the front end portion of the melt nozzle is formed by a truncated conical curved surface with the center line of the melt nozzle as the axis of symmetry, and a plurality of linear jets are jetted along the side surface to form the front end surface of the melt nozzle. Since the molten metal flows out through the molten metal nozzle hole that opens in the center of the nozzle, the jet of atomizing gas does not directly cool the nozzle hole outlet, so cooling of the molten metal that flows out of the molten metal nozzle hole is prevented and it is a high melting point metal. Even if it is not clogged with holes.
【０００７】また、溶湯ノズル先端部の外周側面より逆
円錐形状に噴射された複数本の線状ジェットは、交差域
における相互干渉により、交差域から溶湯ノズル孔出口
部に指向する噴霧ガスの上昇流が生じる。一方、溶湯ノ
ズル孔より流出した金属溶湯は、前記上昇流が吹き付け
られるため、溶湯ノズル先端面に沿って放射方向に広が
る膜状流を形成する。該膜状流は、溶湯ノズルの先端面
の周縁において、溶湯ノズルの先端部外周側面に沿って
噴出されたジェットによって一次的に粉化される。この
場合、溶湯流は膜状流となっているため、ジェットによ
る粉砕効果が大きく、微粉化が促進される。Further, the plurality of linear jets jetted in an inverted conical shape from the outer peripheral side surface of the tip of the molten metal nozzle interfere with each other in the intersecting region, so that the spray gas rising from the intersecting region toward the outlet of the molten metal nozzle hole rises. A flow occurs. On the other hand, the molten metal flowing out from the molten metal nozzle hole is sprayed with the ascending flow, and thus forms a film-like flow that spreads in the radial direction along the molten metal nozzle tip surface. The membranous flow is primarily pulverized by a jet ejected along the outer peripheral side surface of the front end portion of the melt nozzle at the peripheral edge of the front end surface of the melt nozzle. In this case, since the molten metal flow is in the form of a film, the crushing effect of the jet is great and the pulverization is promoted.
【０００８】また、複数本の線状ジェットは、溶湯ノズ
ルの先端部外周側面を形成する逆円錐曲面の母線からず
れた方向に噴出されるため、各ジェットの粉化エネルギ
ーの最も高い中心部が相互に干渉せず、ガス速度の減衰
が防止でき、高エネルギーを保持したまま、ジェットが
相互に接近した交差域を有する逆円形状のジェットの集
合体 (ガスカーテンと呼ぶ。) を形成することができ
る。従って、溶湯ノズルの先端面周縁において一次粉化
された溶湯 (溶滴) は、更に前記ガスカーテンの交差域
において再粉化され、粒度分布の幅の狭い、均一粒度の
微粉が容易に得られる。尚、各ジェットは、溶湯ノズル
の中心線に対してねじれており、ジェットカーテンは旋
回しているように見えるので、該ジェットカーテンを旋
回ジェットカーテンと呼ぶ。Further, since a plurality of linear jets are ejected in a direction deviated from the generatrix of the inverted conical curved surface forming the outer peripheral side surface of the tip portion of the molten metal nozzle, the central portion of each jet having the highest pulverization energy is To form an aggregate of jets (referred to as a gas curtain) in the shape of an inverted circle, which have a crossing region where jets are close to each other while not interfering with each other, preventing gas velocity from being attenuated, and retaining high energy. You can Therefore, the molten metal (droplets) that has been primary powdered at the peripheral edge of the front end surface of the molten metal nozzle is re-pulverized in the intersection area of the gas curtain, and fine powder with a narrow particle size distribution and uniform particle size can be easily obtained. .. The jet curtains are called swirling jet curtains because each jet is twisted with respect to the center line of the molten metal nozzle and the jet curtains appear to swirl.
【０００９】[0009]
【実施例】本発明を実施するためのアトマイズ装置の噴
霧ノズル装置の一例を図１に示す。尚、アトマイズ装置
の他の部分の構造は従来と同様であり、溶湯ノズル3 の
上部は金属溶湯を収容するタンディッシュ底部に装着さ
れ、噴霧ノズル装置1 の下方には金属粉末や噴霧ガスを
回収するためのアトマイズチャンバーが気密に設けられ
る。FIG. 1 shows an example of a spray nozzle device of an atomizing device for carrying out the present invention. The structure of the other parts of the atomizing device is the same as the conventional one, and the upper part of the molten metal nozzle 3 is attached to the bottom part of the tundish containing the molten metal, and the lower part of the atomizing nozzle device 1 collects the metal powder and the atomizing gas. An atomizing chamber is installed in an airtight manner.
【００１０】噴霧ノズル装置1 は、内部に環状のガス室
5 を備えたノズル本体2 と、該本体2 の中央開口部に貫
通状に装着された溶湯ノズル3 とで構成されている。前
記ガス室5 には高圧の噴霧ガスを供給するためのガス導
入管6 が連通して設けられている。一方、溶湯ノズル3
の先端部7 の外周側面8 は溶湯ノズル3 の中心線を対称
軸とする截頭逆円錐形状の曲面で形成され、先端面9 の
中心部には溶湯ノズル孔10が開口している。また、ノズ
ル本体2 の内面には、前記先端部外周側面8 に沿って開
口した複数個のガスノズル孔11が、溶湯ノズル孔10の中
心線を中心とする同心円上に等間隔で開設されている。
各ガスノズル孔11のノズル中心線は、溶湯ノズル3 の先
端部外周側面8 に沿って、かつ逆円錐曲面の母線から等
角度でずれた方向に向いている。すなわち、各ガスノズ
ル孔11は図２および図３に示すように、そのガスノズル
孔中心線が溶湯ノズル孔10の中心線回りに仮想した直径
Ｄの円周に接するように、溶湯ノズル孔中心線に対して
水平方向にほぼａの角度 (旋回角度) で等方向にずれて
いる。同図において、11A はガスノズル孔11の出口部を
示しており、θは溶湯ノズル孔10の中心線に対する旋回
ジェットカーテンの見かけの交差角を示す。The spray nozzle device 1 has an annular gas chamber inside.
The main body 2 is provided with a nozzle body 2, and a molten metal nozzle 3 is inserted through a central opening of the main body 2 in a penetrating manner. A gas introduction pipe 6 for supplying a high-pressure atomizing gas is provided in communication with the gas chamber 5. Meanwhile, the melt nozzle 3
The outer peripheral side surface 8 of the tip portion 7 is formed by a curved surface of a truncated conical shape with the center line of the melt nozzle 3 as the axis of symmetry, and a melt nozzle hole 10 is opened at the center of the tip surface 9. Further, on the inner surface of the nozzle body 2, a plurality of gas nozzle holes 11 opened along the outer peripheral side surface 8 of the tip portion are provided at equal intervals on a concentric circle centered on the center line of the molten metal nozzle hole 10. ..
The nozzle center line of each gas nozzle hole 11 is oriented along the tip outer peripheral side surface 8 of the molten metal nozzle 3 and in a direction deviated at an equal angle from the generatrix of the inverse conical curved surface. That is, as shown in FIG. 2 and FIG. 3, each gas nozzle hole 11 is formed so that the center line of the gas nozzle hole is in contact with the circumference of the virtual diameter D around the center line of the melt nozzle hole 10 so as to be in contact with the center line of the melt nozzle hole. On the other hand, they are offset in the horizontal direction by an angle of a (turning angle) in the same direction. In the figure, 11A indicates the outlet of the gas nozzle hole 11, and θ indicates the apparent intersection angle of the swirling jet curtain with respect to the center line of the molten metal nozzle hole 10.
【００１１】旋回ジェットカーテンの見かけの交差角θ
は操業上は60度程度まで有効であり、45〜60度程とする
のがよい。一方、旋回角度ａは、ガスジェットの内接円
直径Ｄを溶湯ノズル孔直径ｄに対してＤ／ｄ＝１〜３と
なるように設定するのがよい。１未満ではガスジェット
相互の干渉が著しくなり、ガスジェットの流速を減少さ
せ、微粉化を妨げる。一方、３を越えると内接円内が大
きくなり、溶湯粉化の効果が減少するからである。Apparent intersection angle θ of the swirling jet curtain
Is effective up to about 60 degrees in operation, and it is good to set it to about 45 to 60 degrees. On the other hand, the swirl angle a is preferably set so that the inscribed circle diameter D of the gas jet is D / d = 1 to 3 with respect to the melt nozzle hole diameter d. If it is less than 1, the mutual interference of gas jets becomes significant, the flow velocity of gas jets is reduced, and pulverization is hindered. On the other hand, if it exceeds 3, the inside of the inscribed circle becomes large and the effect of powdering the molten metal decreases.
【００１２】尚、ガスノズル孔11は図例のようにノズル
本体2 に直接穿孔される場合に限らず、管状のノズル孔
を有するノズルチップの複数個をノズル本体2 に環状に
隣接設置してもよい。タンディシュに収容された金属溶
湯は図４に示すように、溶湯ノズル3 を介し、そのノズ
ル孔10より流下する。一方、ガス導入管6 より導入され
た圧縮性ガス(噴霧ガス) はガス室5 を経て複数のガス
ノズル孔11より逆円錐形状のジェット12として噴射され
る。この際、溶湯ノズル先端部外周側面8 はガスガイド
面として機能する。ジェット12の交差域13において、ジ
ェット中心の周辺部同士が干渉するため上昇流14が生
じ、これが溶湯ノズル孔10より流出した溶湯に吹き付け
られる。このため、溶湯は、溶湯ノズル3 の先端面9 に
沿って膜状に付着しつつ放射方向に流動する膜状流15と
なり、先端面9 の周縁において、ジェット12によって粉
砕される。一次粉砕された溶湯 (溶滴) は、更に、旋回
ジェットカーテンの交差域13において、二次粉砕され
る。かかる２段の粉化により、分布幅の狭い、均一粒度
の粉末が得られる。The gas nozzle hole 11 is not limited to the case where the gas nozzle hole 11 is directly drilled in the nozzle body 2 as shown in the figure, but a plurality of nozzle tips having tubular nozzle holes may be installed adjacent to the nozzle body 2 in an annular shape. Good. As shown in FIG. 4, the metal melt contained in the tundish flows through the melt nozzle 3 and down through the nozzle hole 10. On the other hand, the compressible gas (spray gas) introduced through the gas introduction pipe 6 is injected as a reverse conical jet 12 from the plurality of gas nozzle holes 11 through the gas chamber 5. At this time, the outer peripheral side surface 8 of the molten metal nozzle tip portion functions as a gas guide surface. In the intersection area 13 of the jets 12, the peripheral portions of the jet centers interfere with each other, so that an upward flow 14 is generated, and this is sprayed onto the molten metal flowing out from the molten metal nozzle hole 10. Therefore, the molten metal becomes a film-like flow 15 that adheres in a film shape along the tip surface 9 of the melt nozzle 3 and flows in the radial direction, and is crushed by the jet 12 at the peripheral edge of the tip surface 9. The molten metal (droplets) that has been subjected to primary crushing is further subjected to secondary crushing in the intersection area 13 of the swirling jet curtain. By such two-step pulverization, a powder having a narrow distribution width and a uniform particle size can be obtained.
【００１３】次に、具体的実施例として、Fe−4.5 ％Ｃ
鋼を使用し、下記の条件でガスアトマイズを実施した。
また、比較例として、旋回角度を零とした以外は同様の
条件(但し、ガスカーテン交差角：45度) でガスアトマ
イズを実施した。 実施例アトマイズ条件 溶湯ノズル径：４mm、噴射ガス圧：40kg／cm2 、ガスノ
ズル孔径：1.2 mm、ガスノズル孔数：36個 (等間隔、環
状配置) 、ガスカーテンの見かけ交差角：45度、ガスジ
ェット旋回角度ａ：５度。Next, as a concrete example, Fe-4.5% C
Gas atomization was performed using steel under the following conditions.
As a comparative example, gas atomization was performed under the same conditions (however, the gas curtain crossing angle: 45 degrees) except that the turning angle was set to zero. Examples Atomizing conditions Molten metal nozzle diameter: 4 mm, injection gas pressure: 40 kg / cm 2 , gas nozzle hole diameter: 1.2 mm, number of gas nozzle holes: 36 (equal spacing, annular arrangement), apparent intersection angle of gas curtain: 45 degrees, gas Jet turning angle a: 5 degrees.
【００１４】その結果、実施例は平均粒子径13μm 、標
準偏差2.1 であったのに対し、比較例では平均粒子径17
μm 、標準偏差2.5 であった。As a result, the average particle size was 13 μm and the standard deviation was 2.1 in the examples, whereas the average particle size was 17 in the comparative examples.
μm, standard deviation 2.5.
【００１５】[0015]
【発明の効果】以上説明した通り、本発明の金属粉末の
製造方法によれば、溶湯ノズルの先端部外周側面を溶湯
ノズルの中心線を対称軸とする截頭逆円錐曲面で形成
し、複数本の線状ガスジェットを前記側面に沿ってかつ
前記曲面の母線からずれた方向に噴出させるので、溶湯
ノズル先端面の中心部に開口した溶湯ノズル孔は冷却さ
れにくく、ノズル孔の孔詰りが防止される。また、溶湯
ノズル孔から流出した溶湯はジェットの交差域で発生し
た上昇流によって溶湯ノズル先端面に沿って放射方向に
流れる膜状流となり、溶湯ノズルの周縁で粉砕されると
共にガスジェットの交差域において再粉化されるので、
微粉化のみならず、粒度の均一化をも達成することがで
きる。As described above, according to the method for producing metal powder of the present invention, the outer peripheral surface of the tip of the melt nozzle is formed into a truncated conical curved surface having the center line of the melt nozzle as the axis of symmetry, Since the linear gas jet of the book is jetted along the side surface and in a direction deviated from the generatrix of the curved surface, the molten metal nozzle hole opened at the center of the molten metal nozzle tip surface is difficult to cool, and the nozzle hole is not clogged. To be prevented. Further, the molten metal flowing out from the molten metal nozzle hole becomes a film-like flow that flows radially along the tip of the molten metal nozzle due to the upward flow generated in the intersecting region of the jet, and is crushed at the peripheral edge of the molten metal nozzle and at the intersecting region of the gas jet. Is re-ground in
Not only pulverization but also uniformization of particle size can be achieved.
【図１】本発明を実施するための噴霧ノズル装置の断面
図である。FIG. 1 is a cross-sectional view of a spray nozzle device for carrying out the present invention.
【図２】ガスノズル孔中心線の交差状態を示す平面図で
ある。FIG. 2 is a plan view showing an intersecting state of gas nozzle hole center lines.
【図３】同側面図である。FIG. 3 is a side view of the same.
【図４】本発明の粉化状態を示す噴霧ノズル装置の要部
断面説明図である。FIG. 4 is an explanatory cross-sectional view of a main part of the spray nozzle device showing a pulverized state of the present invention.
【図５】従来の噴霧ノズル装置の断面図である。FIG. 5 is a cross-sectional view of a conventional spray nozzle device.
1 噴霧ノズル装置 3 溶湯ノズル 8 溶湯ノズル先端部外周側面 9 溶湯ノズル先端面 10 溶湯ノズル孔 12 ジェット 13 ジェット交差域 14 上昇流 15 膜状流 1 Spray nozzle device 3 Molten metal nozzle 8 Molten metal nozzle tip outer peripheral side surface 9 Molten metal nozzle tip surface 10 Molten metal nozzle hole 12 Jet 13 Jet intersection area 14 Upflow 15 Membrane flow
Claims (1)
溶湯に噴霧ガスのジェットを衝突させて金属溶湯を粉化
し金属粉末を製造する方法において、 溶湯ノズルの先端部外周側面を溶湯ノズルの中心線を対
称軸とする截頭逆円錐曲面で形成し、複数本の線状ジェ
ットを前記側面に沿ってかつ前記曲面の母線からずれた
方向に噴出させ、溶湯ノズル先端面の中心部に開口した
溶湯ノズル孔から流出した金属溶湯に前記ジェットの交
差域において発生した噴霧ガスの上昇流を吹き付け、金
属溶湯を溶湯ノズル先端面上を放射方向に膜状に流動さ
せ、ノズル先端面の周縁において該膜状流に溶湯ノズル
の先端部外周側面に沿って噴出したジェットを衝突させ
ることを特徴とする金属粉末の製造方法。1. A method for producing a metal powder by pulverizing a metal melt by colliding a jet of spraying gas with the metal melt flowing out from a nozzle hole of the melt nozzle, wherein the outer peripheral side surface of the tip of the melt nozzle is the center line of the melt nozzle. Is formed by a truncated conical curved surface having a symmetry axis, and a plurality of linear jets are ejected along the side surface and in a direction deviated from the generatrix of the curved surface, and the molten metal is opened at the center of the molten metal nozzle tip surface. The rising flow of the spray gas generated at the intersection of the jets is blown to the molten metal flowing out from the nozzle hole to cause the molten metal to flow in a film shape in the radial direction on the tip surface of the molten metal, and the film is formed at the periphery of the tip surface of the nozzle. A method for producing metal powder, characterized in that a jet ejected along the outer peripheral side surface of the tip portion of the molten metal nozzle is caused to collide with a stream.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3219008A JP2834348B2 (en) | 1991-08-29 | 1991-08-29 | Manufacturing method of metal powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3219008A JP2834348B2 (en) | 1991-08-29 | 1991-08-29 | Manufacturing method of metal powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0559411A true JPH0559411A (en) | 1993-03-09 |
| JP2834348B2 JP2834348B2 (en) | 1998-12-09 |
Family
ID=16728816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3219008A Expired - Fee Related JP2834348B2 (en) | 1991-08-29 | 1991-08-29 | Manufacturing method of metal powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2834348B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7677818B2 (en) | 2005-11-04 | 2010-03-16 | Olympus Imaging Corp. | Camera to which plurality of types of photographing lenses or accessories can be detachably attached, and control method of the camera |
| CN106334614A (en) * | 2015-07-08 | 2017-01-18 | 中外炉工业株式会社 | Smashing device and processing device with smashing device |
| CN114160799A (en) * | 2020-09-11 | 2022-03-11 | 三菱动力株式会社 | Metal powder manufacturing apparatus and gas injector thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6913679B1 (en) | 1999-02-11 | 2005-07-05 | The Regents Of The University Of California | Apparatus and methods for high resolution separation of sample components on microfabricated channel devices |
-
1991
- 1991-08-29 JP JP3219008A patent/JP2834348B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7677818B2 (en) | 2005-11-04 | 2010-03-16 | Olympus Imaging Corp. | Camera to which plurality of types of photographing lenses or accessories can be detachably attached, and control method of the camera |
| CN106334614A (en) * | 2015-07-08 | 2017-01-18 | 中外炉工业株式会社 | Smashing device and processing device with smashing device |
| CN114160799A (en) * | 2020-09-11 | 2022-03-11 | 三菱动力株式会社 | Metal powder manufacturing apparatus and gas injector thereof |
| EP3967425A1 (en) * | 2020-09-11 | 2022-03-16 | Mitsubishi Power, Ltd. | Metal powder producing apparatus and gas jet device therefor |
| JP2022046880A (en) * | 2020-09-11 | 2022-03-24 | 三菱重工業株式会社 | Metal powder producing apparatus and gas jet device therefor |
| TWI820465B (en) * | 2020-09-11 | 2023-11-01 | 日商三菱動力股份有限公司 | Metal powder manufacturing device and its gas injector |
| CN114160799B (en) * | 2020-09-11 | 2024-04-09 | 三菱重工业株式会社 | Metal powder manufacturing device and gas injector thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2834348B2 (en) | 1998-12-09 |
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