JPS6280205A - Production of fine metallic powder - Google Patents
Production of fine metallic powderInfo
- Publication number
- JPS6280205A JPS6280205A JP60218605A JP21860585A JPS6280205A JP S6280205 A JPS6280205 A JP S6280205A JP 60218605 A JP60218605 A JP 60218605A JP 21860585 A JP21860585 A JP 21860585A JP S6280205 A JPS6280205 A JP S6280205A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- melted
- metallic
- metal powder
- electrode
- 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.)
- Pending
Links
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は金属微粉末の製造方法に関し、殊に高速高周波
モータを用いたプラズマ回転電極法によって、Ｔｉ、Ｚ
ｒ、Ｔａ等の如き高融点活性全屈或はそれらの合金等か
ら清浄な微粉末を製造する方法に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for producing fine metal powder, and in particular, the production of Ti, Z, and
The present invention relates to a method for producing clean fine powder from high melting point active compounds such as R, Ta, etc. or their alloys.
［従来の技術］
Ｔｉ、Ｚｒ、Ｔａ等の様な活性金属及びそれらの合金等
の金属微粉末は、それ自体の焼結性が良好であるから、
粉末冶金製品製造用原料として好適なものであることが
知られている。即ち一層の微粉化が望まれているのであ
る。また一方熱間強度向上等の為に用いられるセラミッ
ク繊維と金属粉末との複合材料（例えばＴｉ合金粉末を
含む繊維強化金属）等においては、できる限りｉ＃ｉ維
径に近い前記金属微粉末を用いることが、緻密化及び均
−分散化等を推進するうえで好ましいこととされている
。[Prior Art] Fine metal powders such as active metals such as Ti, Zr, Ta, etc. and their alloys have good sinterability by themselves.
It is known to be suitable as a raw material for producing powder metallurgy products. In other words, further pulverization is desired. On the other hand, in composite materials of ceramic fibers and metal powders (for example, fiber-reinforced metals containing Ti alloy powder) used to improve hot strength, etc., the fine metal powders are used as close to the i#i fiber diameter as possible. It is considered preferable to use it in order to promote densification, uniform dispersion, etc.
また活性金属殊にチタン合金の粉末冶金材は、溶解材に
比べ以下に列挙する点で優れており、近時注目されてい
る。Powder metallurgical materials made of active metals, particularly titanium alloys, have been attracting attention in recent years because they are superior to melted materials in the following respects.
（１）任意形状の最終製品が得られる。(1) A final product of arbitrary shape can be obtained.
（２）成形コストの低減が図れる。(2) Molding costs can be reduced.
（３）機械的性質の向上が図れる。(3) Mechanical properties can be improved.
（４）均一なミクロ組織が得られる。(4) A uniform microstructure can be obtained.
前記チタン合金の粉末冶金材は上記の様な特長を有して
いるところから、近年、航空機の機体部品やエンジン部
材の材料として盛んに検討が進められており、一部には
該粉末冶金材を用いたエンジン部材がすでに実用化され
ている。Because the titanium alloy powder metallurgy material has the above-mentioned features, it has been actively studied in recent years as a material for aircraft body parts and engine parts. Engine parts using this have already been put into practical use.
粉末冶金用のチタン合金粉末として現在工業化されてい
るのは、純チタン粉末とＡＩ−Ｖ合金粉末とを混合する
方法と、予め合金化した原料を回転電極法によって粉末
化する方法の２つの方法であるが、航空機部材には疲労
特性等において格別厳しい特性が要求される為、エンジ
ン部材等に適用される粉末冶金材は回転電極法、殊にタ
ングステン（Ｗ）汚染の少ないプラズマ回転電極法によ
って製造したものが好ましいとされている。There are two methods currently being industrialized as titanium alloy powder for powder metallurgy: a method of mixing pure titanium powder and AI-V alloy powder, and a method of powderizing pre-alloyed raw materials using a rotating electrode method. However, since aircraft parts are required to have particularly strict properties such as fatigue properties, powder metallurgy materials applied to engine parts etc. are manufactured using the rotating electrode method, especially the plasma rotating electrode method with less tungsten (W) contamination. It is said that manufactured products are preferable.
第２図は回転電極法（Ｒｏｔａｔｉｎｇ Ｅｌｅｃｔ
ｒｏｄｅＰｒｏｃｅｓｓ ： ＲＥＰ）を示す概略説明
図であり、この方法はチタン合金を電極Ａとし、該電極
を高速（約１５．００Ｏｒｐｍ ）で回転させながら、
不活性ガス雰囲気中で非消耗タングステン電極Ｂとの間
にアークを発生せしめ、アーク熱でチタン合金電極を溶
解させながら遠心力で飛散させることによってチタン合
金粉末を得るものである。生成金属粉末の粒度は、回転
電極（チタン合金電極Ａ）の直径や回転速度を変えるこ
とによって任意に変化させることができる。但し該回転
電極法は、カソード（陰極Ｂ）にタングステンを使用し
ている為該電極の一部が溶融消耗し、これがチタン合金
粉末中に混入してチタン合金材の材料強度特性を低下さ
せるという難点がある。Figure 2 shows the rotating electrode method.
This method uses a titanium alloy as electrode A, and while rotating the electrode at high speed (about 15.00 rpm),
A titanium alloy powder is obtained by generating an arc between the titanium alloy electrode and the non-consumable tungsten electrode B in an inert gas atmosphere, and dissolving the titanium alloy electrode by the arc heat and scattering it by centrifugal force. The particle size of the produced metal powder can be arbitrarily changed by changing the diameter and rotation speed of the rotating electrode (titanium alloy electrode A). However, since the rotating electrode method uses tungsten for the cathode (cathode B), a portion of the electrode is melted and consumed, which is mixed into the titanium alloy powder and reduces the material strength characteristics of the titanium alloy material. There are some difficulties.
上記回転電極法の欠点を改良した方法として、プラズマ
アークを熱源とするプラズマアーク回転電極法（Ｐｌａ
ｓｍａ Ｒｏｔａｔｉｎｇ Ｅｌｅｃｔｒｏｄｅ
Ｐｒｏｃｓｓ ：ＰＲＥＰ）が開発された。第３図は該
プラズマアーク回転電極法を示す概略説明図であり、こ
の方法は、水冷タングステンカソードと水冷銅ノズルの
間にヘリウムガス（又はアルゴンガス）を流し、ヘリウ
ムプラズマアークを熱源としてチタン合金等を溶融し、
前記回転電極法と同様にして金属微粉末を製造するもの
である。As a method that improves the drawbacks of the above-mentioned rotating electrode method, the plasma arc rotating electrode method (PLA) uses a plasma arc as a heat source.
sma Rotating Electrode
Procss:PREP) was developed. FIG. 3 is a schematic explanatory diagram showing the plasma arc rotating electrode method. This method involves flowing helium gas (or argon gas) between a water-cooled tungsten cathode and a water-cooled copper nozzle, and using the helium plasma arc as a heat source. Melt etc.
Fine metal powder is produced in the same manner as the rotating electrode method.
［発明が解決しようとする問題点］
例えば航空機エンジン部材においては前述の如く厳しい
疲労寿命特性が要求されるが、粉末冶金材の疲労寿命は
粉末冶金材中の介在物や外部からの異種金属の混入によ
って著しい悪影響を受け、更には成形体のミクロ組織に
よっても寿命の短縮化を来たし、航空機エンジン部材に
とって致命的な欠陥となる。[Problems to be solved by the invention] For example, aircraft engine parts are required to have severe fatigue life characteristics as mentioned above, but the fatigue life of powder metallurgy materials is limited by inclusions in the powder metallurgy materials and dissimilar metals from the outside. The contamination will have a significant adverse effect, and furthermore, the microstructure of the molded product will shorten its lifespan, resulting in a fatal defect for aircraft engine components.
介在物や異種金属の混入は管理上の問題であり、原料の
選択や粉末の取扱い等をクリーンルーム内で行なうこと
により解決できる。一方ミクロ組織と疲労寿命特性の関
係については、例えばＴｉ−６ＡＩ−４Ｖ合金（Ｔｉに
６％ＡＩ 、４％Ｖを含有させた合金）の場合にはα相
結晶の７スペクト化（結晶の短軸と長−の長さの比）が
１に近いほど疲労寿命特性が良好になることが確認され
ている。この様なアスペクト比が１に近いミクａｍａは
、粉末製造時の急冷速度が大きいほど可能となる。The contamination of inclusions and dissimilar metals is a management problem that can be solved by selecting raw materials and handling powder in a clean room. On the other hand, regarding the relationship between the microstructure and fatigue life characteristics, for example, in the case of Ti-6AI-4V alloy (an alloy containing 6% AI and 4% V in Ti), the α phase crystal has seven spectra (the crystal is shortened). It has been confirmed that the closer the ratio (axis to length) is to 1, the better the fatigue life characteristics become. Such micro-ama with an aspect ratio close to 1 becomes possible as the quenching rate during powder production increases.
ミクロ組織の細かさを表わす指標として２次樹技状結晶
間距離（Ｄｅｎｄｒｉｔｅ ａｒｍ ｓｐａｃｉｎ
ｇ ：以下り、Ａ、Ｓ、と略称する）が知られている。As an index expressing the fineness of the microstructure, the distance between secondary dendritic crystals (Dendrite arm spacin
g: Hereinafter abbreviated as A and S) are known.
第４図は、Ｄ、Ａ、Ｓと粉末粒径との関係を示すグラフ
である。第４図には粉末製造時の不活性ガス雰囲気がＡ
ｒの場合を示しているが、いずれにしても回転電極法で
金属粉末を製造した場合には、細かい金属粉末はどり、
Ａ、Ｓ、値は小さく、従ってミクロ組織は細かくなる傾
向を示しており、例えば金属粉末の粒径が１００ｇｍか
ら５０＃Ｌｍとなるとミクロ組織は約３０％小さくなる
と言われている。一般にり、Ａ、Ｓ、が小さくなると７
スペクト比も小さくなる傾向があり、この様な意味から
も航空機エンジン部材等の疲労寿命を向上させる為には
金属粉末の粒度をできるだけ細かくするのが望ましい。FIG. 4 is a graph showing the relationship between D, A, S and powder particle size. Figure 4 shows the inert gas atmosphere during powder production.
The case of r is shown, but in any case, when metal powder is manufactured by the rotating electrode method, fine metal powder scatters,
The A, S values are small, and therefore the microstructure tends to become finer. For example, it is said that when the particle size of metal powder increases from 100 gm to 50 #Lm, the microstructure becomes smaller by about 30%. Generally speaking, when A and S become smaller, 7
The spectral ratio also tends to become smaller, and from this point of view as well, it is desirable to make the particle size of the metal powder as fine as possible in order to improve the fatigue life of aircraft engine parts and the like.
回転電極法による金属粉末製造方法に関する公知技術は
下記第１表に示す通りである。Known techniques for producing metal powder using the rotating electrode method are shown in Table 1 below.
第 １ 表
※Ｉ Ｍｅｔａｌ Ｐｏｗｄｏｒ Ｒｅｐｏｒｔ、（１
９８４Ｓｅｐｔｅｍｂｅｒ）Ｐ、５２７
※２ 粉体粉末冶金協会９機械部品小委員会（１９８５
，２，２７，）
※３ 白木金属学会 昭和５９年春期講演大会（１９８
４，４，３，）
上記第１表から明らかな様に、公知の方法で製造される
金属粉末の粒径（平均粒径）は７０ｐｍ以上であるのが
現状である。Table 1 *I Metal Powder Report, (1
984 September) P, 527 *2 Powder Metallurgy Association 9 Machinery Parts Subcommittee (1985
, 2, 27,) *3 Shiraki Institute of Metals 1981 Spring Lecture Conference (198
4, 4, 3,) As is clear from Table 1 above, the particle size (average particle size) of metal powder produced by known methods is currently 70 pm or more.
本発明は上記現状に鑑みなされたものであって、粉末冶
金製品の疲労寿命特性を更に向上すべく、平均粒径５０
ルｍ未満の金属微粉末を製造することのできる方法を提
供しようとするものである。The present invention was made in view of the above-mentioned current situation, and aims to further improve the fatigue life characteristics of powder metallurgy products.
It is an object of the present invention to provide a method capable of producing fine metal powder with a particle size of less than m.
［問題点を解決する為の手段］
本発明は、不活性ガス雰囲気中で被溶解金属棒を高速回
転させつつその先端にプラズマアークを適用し、前記被
溶解金属棒をその先端から溶融飛散させて金属微粉末を
得る方法において、被溶解金属棒を９，０００〜１１，
０００ｍ／ｗｉｎ （７）周速度で高速回転させる点に
要旨を有するものである。[Means for solving the problem] The present invention applies a plasma arc to the tip of a metal rod to be melted while rotating it at high speed in an inert gas atmosphere, so that the metal rod to be melted is melted and scattered from the tip. In this method, the metal rod to be melted is heated to 9,000 to 11,000 yen.
000m/win (7) The main point is to rotate at high speed at a circumferential speed.
［作用］
本発明者らは回転電極法について種々検討した結果、金
属粉末の原料となる消耗電極の大きさく径）及び該電極
の回転数で決まる周速度が金属粉末の平均粒径と強い相
関関係をもっていることを見出した０例えばＴｉ−６Ａ
Ｉ−４Ｖ合金を消耗電極として用い、回転電極法による
周速度と、得られた金属粉末の粒径との関係を求めた。[Function] As a result of various studies on the rotating electrode method, the present inventors found that the circumferential speed, which is determined by the size and diameter of the consumable electrode that is the raw material for the metal powder and the rotation speed of the electrode, has a strong correlation with the average particle size of the metal powder. For example, Ti-6A
Using an I-4V alloy as a consumable electrode, the relationship between the peripheral speed by the rotating electrode method and the particle size of the obtained metal powder was determined.
第５図は、本発明に従って構成される金属粉末製造装置
ｌ（第１図参照）を用いて操業した結果得られたもので
あり、周速度（ｍ／ｉ＋ｉｎ）をＸ軸、平均粒径（ｐｍ
）をＹ軸とした場合には下記の（１）式の関係が成立す
る。FIG. 5 shows the results obtained by operating the metal powder manufacturing apparatus 1 (see FIG. 1) constructed according to the present invention, with the circumferential speed (m/i+in) on the X axis and the average particle size ( pm
) is set as the Y axis, the following relationship (1) holds true.
ｌｏｇ Ｙ ＝ −０，８１５ｌｏｇ Ｘ＋４．９２２
ｍ （１）」；記（１）式の結果に従って考慮し
、周速度を成る一定の範囲に特定することによって目標
とする平均粒径（５０ＪＬｍ未満）が得られるものと判
断した。log Y = -0,815log X+4.922
m (1)''; Considering the results of equation (1), it was determined that the target average particle size (less than 50 JLm) could be obtained by specifying the circumferential velocity within a certain range.
第５図は第１図に示した金属粉末製造装置１で操業した
結果を示すものであり、従って金属粉末製造装置１の構
成を明確にする必要がある。FIG. 5 shows the results of operating the metal powder manufacturing apparatus 1 shown in FIG. 1, and therefore it is necessary to clarify the configuration of the metal powder manufacturing apparatus 1.
金属粉末製造袋Ｒ１（第１図）の各要素について列挙す
ると下記の通りである。Each element of the metal powder manufacturing bag R1 (FIG. 1) is listed below.
く熱源〉
熱源としては電気アーク、プラズマアーク等が一般に知
られている。既述した様に電気アークを熱源として用い
た場合には、非消耗電極にＷを使用している為、Ｗが一
部欠落し或いは溶損して生成粉末中に混入してしまう恐
れがある。Heat source> Electric arc, plasma arc, etc. are generally known as heat sources. As described above, when an electric arc is used as a heat source, since W is used for the non-consumable electrode, there is a risk that some W may be missing or melted and mixed into the produced powder.
従って本発明の製造装Ｎ１ではプラズマアークを熱源と
して用いたプラズマアーク回転電極法を採用している。Therefore, the manufacturing apparatus N1 of the present invention employs a plasma arc rotating electrode method using a plasma arc as a heat source.
このことによってＷ汚染の問題がなく、清浄な金属粉末
を得ることができる。この他熱源としては電子ビーム（
Ｅ、Ｂ、）を採用する方式もあるが、真空で用いる電子
ビーム溶解はＴｆ−６ＡＩ−４Ｖ合金の様に揮発性のＡ
Ｉ等を含む場合にはＡｔの濃度偏析が生じる恐れがある
為好ましくない。This eliminates the problem of W contamination and makes it possible to obtain clean metal powder. Other heat sources include electron beams (
There is a method that uses volatile A, B, etc., but electron beam melting in a vacuum uses volatile A, such as Tf-6AI-4V alloy.
If it contains I or the like, it is not preferable because there is a risk of concentration segregation of At.
く高速モータ２〉
第５図から明らかな様に平均粒径５０ｐｍ未満の金属粉
末を得る為には、周速度９，０００ｍ／ｗｉｎ以上にす
る必要がある。従って消耗電極の径を３２〜５０■■φ
であるとした場合、最大回転数がｇｏ、ｏｏ。High-speed motor 2> As is clear from FIG. 5, in order to obtain metal powder with an average particle size of less than 50 pm, it is necessary to increase the peripheral speed to 9,000 m/win or more. Therefore, the diameter of the consumable electrode should be set to 32~50■■φ
If so, the maximum rotation speed is go, oo.
ｒｐｍ程度の高速モータ２を採用する必要がある。It is necessary to employ a high-speed motor 2 of approximately rpm.
本発明では上記条件を満足する高速モータ２を採用した
。尚回転数の制御は電圧の可変制御により行なう０周速
度が１１，０００ｍ／ｗｉｎを超えると電極径を大きく
するか、又はモータの回転数や電力をアップさせる必要
があり、いずれの場合も回転駆動用モータには極めて高
い能力が要求されるため、大変高価なものとなり現実的
ではない、従って本発明においては周速度の上限を１１
，０００■／ｓｉｎとした。The present invention employs a high-speed motor 2 that satisfies the above conditions. The rotation speed is controlled by variable voltage control. If the zero peripheral speed exceeds 11,000 m/win, it is necessary to increase the electrode diameter or increase the motor rotation speed or power. In either case, the rotation speed The drive motor is required to have extremely high performance, making it extremely expensive and impractical.Therefore, in the present invention, the upper limit of the peripheral speed is set to 11.
,000■/sin.
く電極〉
偏心回転による弊害を防止する為、各電極の加工精度は
重要な項目であり、旋盤精密加工の他、スェージング加
工、パフ研磨等によって加工精度を上げる必要がある場
合も生じる。Electrode> In order to prevent the harmful effects of eccentric rotation, the processing accuracy of each electrode is an important item, and in addition to lathe precision processing, there are cases where it is necessary to improve processing accuracy by swaging processing, puff polishing, etc.
（ａ）活性金属電極（消耗電極３）
本発明では、消耗電極３はチャンバー５内に組み込む方
式を採用した。その他第２図に示した様なチャンバー外
挿方式でもよいが、該方式では超高速回転の為の磁性流
体を用いる様な特別な軸受けが必要となる。(a) Active Metal Electrode (Consumable Electrode 3) In the present invention, the consumable electrode 3 is incorporated into the chamber 5. Alternatively, a chamber extrapolation method as shown in FIG. 2 may be used, but this method requires a special bearing that uses magnetic fluid for ultra-high speed rotation.
（ｂ）非消耗電極（プラズマトーチ４）溶解が円滑に行
なわれる様、上下、左右に動く方式を採用した。(b) Non-consumable electrode (plasma torch 4) A method of moving vertically and horizontally was adopted to ensure smooth melting.
く真空チャンバー５〉
掃除しやすい様に内面＃３００でパフ研磨仕上げを行な
っている。一般的には真空時のチャンバー変形防止の為
チャンバー内には補強棒が設けられるが、これは生成金
属粉末の回収やチャンバー内清掃の際には支障となる。Vacuum chamber 5〉 The inner surface is #300 and has a puff-polished finish for easy cleaning. Generally, a reinforcing rod is provided inside the chamber to prevent the chamber from deforming when vacuum is applied, but this becomes a hindrance when recovering the produced metal powder and cleaning the inside of the chamber.
特に粉末金属の種類を変えた場合は混粉防止の為に清掃
を徹底的に実施する必要があるので、補強棒のないチャ
ンバーを採用するのが望ましい０本発明では真空溶解チ
ャンバーの様な両側面円錐形の真空チャンバ−５を採用
しており、チャンバー内の補強棒又はそれに類似するも
のは全く存在しない、尚第１図中の符号７は粉末回収容
器である。In particular, when changing the type of powder metal, it is necessary to thoroughly clean it to prevent powder mixing, so it is preferable to use a chamber without reinforcing rods. A conical vacuum chamber 5 is employed, and there are no reinforcing rods or anything similar within the chamber. Reference numeral 7 in FIG. 1 is a powder collection container.
く操業〉
チャンバー５内の真空雰囲気は油圧式回転ポンプによっ
て排気管６からチャンバー５内の気体（主に空気）を排
出することにより、１０−３Ｔｏｒｒの真空度が約３０
公租度の吸引で達成できるように構成される。その後排
気管６をガス導入管として兼用し、アルゴンガスをチャ
ンバー５内に導入して約１気圧の状態で操業する。この
際には生成金属粉末の酸化が問題となる為、系内を高真
空に保つ他、導入されるアルゴンガス中の酸素濃度を極
力低くする必要がある。Operation> The vacuum atmosphere inside the chamber 5 is maintained at a vacuum degree of 10-3 Torr by discharging the gas (mainly air) inside the chamber 5 from the exhaust pipe 6 using a hydraulic rotary pump.
Constructed in such a way that it can be achieved with aspiration of fairness. Thereafter, the exhaust pipe 6 is also used as a gas introduction pipe, and argon gas is introduced into the chamber 5 to operate at about 1 atmosphere. At this time, oxidation of the produced metal powder becomes a problem, so in addition to keeping the system in a high vacuum, it is necessary to keep the oxygen concentration in the argon gas introduced as low as possible.
［実施例］
第１図に示した装置ｌを用いてチタン合金粉末の製造を
行なった。アルゴンガスで置換した（１気圧下） チャ
フ／＜ ５内で、Ｔｉ−６ＡＩ−４Ｖ合金の消耗電極
３ （５０，４ｍ■す）を６０，０００ｒｐ■ （周速
度９，５００ｍ／腸ｉｎ）で回転させ、該電極３とプラ
ズマアーク電極４との間に約５００ＡＸ２０Ｖの電力を
供給し、金属微粉末の製造・回収を行なった。[Example] Titanium alloy powder was manufactured using the apparatus 1 shown in FIG. The Ti-6AI-4V alloy consumable electrode 3 (50,4 m) was heated at 60,000 rpm (circumferential speed 9,500 m/in) within a chaff/< 5, purged with argon gas (under 1 atm). While rotating, power of about 500 AX 20 V was supplied between the electrode 3 and the plasma arc electrode 4, and fine metal powder was produced and recovered.
その結果、平均粒径が４７ｇｍで酸素量が０．１５％の
清浄な金属粉末を得ることができた。As a result, clean metal powder with an average particle size of 47 gm and an oxygen content of 0.15% could be obtained.
［発明の効果］
本発明は以上の様に構成されるが、要は各要素を厳選し
た製造装置を用い、プラズマアーク回転電極法を応用す
ると共に周速度を特定することによって平均粒径５０＃
Ｌｍ未満の金属微粉末を製造することができ、その結果
下記の様な利益を得ることができる。[Effects of the Invention] The present invention is constructed as described above, but the key point is that the average grain size is 50# by using a manufacturing device with carefully selected elements, applying the plasma arc rotating electrode method, and specifying the circumferential speed.
It is possible to produce metal fine powder with a particle size of less than Lm, and as a result, the following benefits can be obtained.
（１）微粉化によって粉末冶金製品の焼結性の向上が図
れる。(1) The sinterability of powder metallurgy products can be improved by pulverization.
（２）急速冷却が達成され、製品組織の均一微細化に伴
なう材料時性の向上が図れる。(2) Rapid cooling is achieved, and material stability can be improved as the product structure becomes more uniform and finer.
（３）活性金属を粉末冶金用及び溶射用材料として使用
する場合、溶射の出来具合は粉末粒子が微細な程また球
状である程緻密性、接着性１表面平滑性等の点において
優れたものとなることが知られており、こうした観点か
らしても本発明により製造される金属微粉末は粉末冶金
用及び溶射用材料として非常に優れたものと言える。(3) When active metals are used as materials for powder metallurgy and thermal spraying, the finer the powder particles or the more spherical the particles, the better the quality of the thermal spraying in terms of density, adhesion, surface smoothness, etc. It is known that, from this point of view, the metal fine powder produced by the present invention can be said to be extremely excellent as a material for powder metallurgy and thermal spraying.
第１図は本発明を実施するに当たり使用される金属粉末
製造装置を例示する概略説明図、第２図は回転電極法の
概略説明図、第３図はプラズマアーク回転電極法の概略
説明図、第４図はり。
Ａ、Ｓと粉末粒径との関係を示すグラフ、第５図は周速
度と金属粉末粒径との関係を示すグラフである。
ｌ・・・金属粉末製造装置
２・・・高速モータ ３・・・消耗′電極４・・・
プラズマトーチ ５・・・真空チャンバー６・・・排気
管FIG. 1 is a schematic explanatory diagram illustrating a metal powder manufacturing apparatus used in carrying out the present invention, FIG. 2 is a schematic explanatory diagram of the rotating electrode method, and FIG. 3 is a schematic explanatory diagram of the plasma arc rotating electrode method. Figure 4: Beam. A graph showing the relationship between A and S and the powder particle size, and FIG. 5 is a graph showing the relationship between the peripheral speed and the metal powder particle size. l...Metal powder manufacturing equipment 2...High speed motor 3...Consumable electrode 4...
Plasma torch 5...Vacuum chamber 6...Exhaust pipe
Claims (1)
その先端にプラズマアークを適用し、前記被溶解金属棒
をその先端から溶融飛散させて金属微粉末を得る方法に
おいて、 被溶解金属棒を９，０００〜１１，０００ｍ／ｍｉｎの
周速度で高速回転させることを特徴とする金属微粉末の
製造方法。[Claims] A method for obtaining fine metal powder by applying a plasma arc to the tip of a metal rod to be melted while rotating it at high speed in an inert gas atmosphere, and melting and scattering the metal rod from the tip. A method for producing fine metal powder, which comprises rotating a metal rod to be melted at high speed at a circumferential speed of 9,000 to 11,000 m/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60218605A JPS6280205A (en) | 1985-10-01 | 1985-10-01 | Production of fine metallic powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60218605A JPS6280205A (en) | 1985-10-01 | 1985-10-01 | Production of fine metallic powder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6280205A true JPS6280205A (en) | 1987-04-13 |
Family
ID=16722574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60218605A Pending JPS6280205A (en) | 1985-10-01 | 1985-10-01 | Production of fine metallic powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6280205A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02156003A (en) * | 1988-12-07 | 1990-06-15 | Nippon Steel Weld Prod & Eng Co Ltd | Manufacture of alloy powder containing titanium-aluminum intermetallic compound |
| JP2003001389A (en) * | 2001-06-15 | 2003-01-07 | Showa Denko Kk | Manufacturing method for hydrogen absorbing alloy |
| CN102528064A (en) * | 2012-02-23 | 2012-07-04 | 姚振梅 | Equipment and technology for preparing metal powder |
| CN109014228A (en) * | 2018-10-09 | 2018-12-18 | 陕西科技大学 | A method of copper alloy powder is prepared based on plasma rotating electrode |
| CN112453418A (en) * | 2021-01-28 | 2021-03-09 | 西安赛隆金属材料有限责任公司 | Plasma arc generating device, powder making equipment and using method thereof |
| WO2024000919A1 (en) * | 2022-07-01 | 2024-01-04 | 南京尚吉增材制造研究院有限公司 | Preparation method and system for titanium or titanium alloy powder having high degree of sphericity and low oxygen increment |
-
1985
- 1985-10-01 JP JP60218605A patent/JPS6280205A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02156003A (en) * | 1988-12-07 | 1990-06-15 | Nippon Steel Weld Prod & Eng Co Ltd | Manufacture of alloy powder containing titanium-aluminum intermetallic compound |
| JP2003001389A (en) * | 2001-06-15 | 2003-01-07 | Showa Denko Kk | Manufacturing method for hydrogen absorbing alloy |
| JP4712228B2 (en) * | 2001-06-15 | 2011-06-29 | 昭和電工株式会社 | Method for producing hydrogen storage alloy |
| CN102528064A (en) * | 2012-02-23 | 2012-07-04 | 姚振梅 | Equipment and technology for preparing metal powder |
| CN109014228A (en) * | 2018-10-09 | 2018-12-18 | 陕西科技大学 | A method of copper alloy powder is prepared based on plasma rotating electrode |
| CN112453418A (en) * | 2021-01-28 | 2021-03-09 | 西安赛隆金属材料有限责任公司 | Plasma arc generating device, powder making equipment and using method thereof |
| WO2024000919A1 (en) * | 2022-07-01 | 2024-01-04 | 南京尚吉增材制造研究院有限公司 | Preparation method and system for titanium or titanium alloy powder having high degree of sphericity and low oxygen increment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR102639133B1 (en) | Process for producing spheroidized powder from feedstock materials | |
| Chou et al. | Fibre-reinforced metal-matrix composites | |
| El-Eskandarany | Mechanical alloying: nanotechnology, materials science and powder metallurgy | |
| CA1269549A (en) | Production of mechanically alloyed powder | |
| Savage et al. | Production of rapidly solidified metals and alloys | |
| EP0088578B1 (en) | Production of mechanically alloyed powder | |
| El-Eskandarany | Mechanical Alloying: Energy Storage, Protective Coatings, and Medical Applications | |
| JPS6242705B2 (en) | ||
| TWI221101B (en) | Method for producing alloy powder by dual self-fusion rotary electrodes | |
| JPS58197206A (en) | Production of powder of high grade metal or its alloy | |
| JP2021532267A (en) | Cost-effective powder manufacturing method | |
| Neikov et al. | Mechanical alloying | |
| Bodkin et al. | Centrifugal shot casting: a new atomization process for the preparation of high-purity alloy powders | |
| CN108031854A (en) | A kind of method of modifying at the metal dust interface for 3D printing | |
| CN101927351A (en) | Method for preparing high temperature alloy GH 4169 metal globule by utilizing auxiliary plasma rotation electrode | |
| CN109014228A (en) | A method of copper alloy powder is prepared based on plasma rotating electrode | |
| US20050150759A1 (en) | Powder and coating formation method and apparatus | |
| Zoz et al. | Improve Ag-SnO~ 2 Electrical Contact Material Produced by Mechanical Alloying | |
| US4482375A (en) | Laser melt spin atomized metal powder and process | |
| JPS6280205A (en) | Production of fine metallic powder | |
| EP0282604A1 (en) | Apparatus for producing powder and process for its production | |
| Yamaoglu et al. | Consolidation of Al-nanoSiC composites by spark plasma sintering | |
| US20080241350A1 (en) | Method for fabricating a medical component from a material having a high carbide phase | |
| JPH0331405A (en) | Method and apparatus for producing metallic powder | |
| JP2008189995A (en) | Method for producing oxide particle dispersion strengthened alloy by casting |