JPH07145408A - Production of rapidly solidified powder - Google Patents
Production of rapidly solidified powderInfo
- Publication number
- JPH07145408A JPH07145408A JP9704693A JP9704693A JPH07145408A JP H07145408 A JPH07145408 A JP H07145408A JP 9704693 A JP9704693 A JP 9704693A JP 9704693 A JP9704693 A JP 9704693A JP H07145408 A JPH07145408 A JP H07145408A
- Authority
- JP
- Japan
- Prior art keywords
- disk
- molten metal
- powder
- rapidly solidified
- spraying
- 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.)
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- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、新素材の創製手段とし
て非常な注目を集めている急冷凝固金属粉末を、遠心力
噴霧法によって製造する方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a rapidly solidified metal powder by a centrifugal spraying method, which has received a great deal of attention as a means for creating a new material.
【０００２】[0002]
【従来の技術】金属および合金材料はこれまで主に溶解
鋳造法によって製造されている。しかし、材料の高度
化、高機能化等の諸要望に対しては従来からの溶解鋳造
法ではその目的を達し得ない場合が多々生じているのが
現状である。2. Description of the Prior Art Metal and alloy materials have hitherto been produced mainly by melt casting. However, under the present circumstances, there are many cases where the conventional melt-casting method cannot meet the purpose in order to meet various demands such as sophistication and sophistication of materials.
【０００３】この問題点を解決する手法として、粉末を
出発原料とする粉末成形法が注目され、その中でも特に
急冷凝固粉末法による新素材の創製技術が脚光を浴びて
いる。As a method for solving this problem, a powder molding method using a powder as a starting material has attracted attention, and among them, a technique for creating a new material by the rapid solidification powder method has been in the limelight.
【０００４】急冷凝固粉末とは、金属溶湯から粉末を製
造する際の凝固速度を、従来からの一般的な噴霧法の場
合よりも更に速め、104〜106℃/secのオーダーに上昇さ
せたものである。この急冷凝固の効果によって、合金元
素の偏析の防止、金属組織の微細化・均質化、合金元素
の過飽和固溶、準安定相の出現などがなされる。このよ
うな優れた組織特性を有する急冷凝固粉末を適切なプロ
セスの下で固化成形すれば、強度、靱性、耐熱性、耐摩
耗性などの機械的性質や電磁気などの物理的性質に優れ
た新素材粉末成形体を創製することが可能となる。The rapidly solidified powder is a solidification rate for producing powder from a molten metal which is further increased as compared with the conventional general spraying method and is increased to the order of 10 4 to 10 6 ° C / sec. It is a thing. Due to the effect of the rapid solidification, the segregation of alloying elements is prevented, the microstructure of the metal structure is refined / homogenized, the supersaturated solid solution of alloying elements, and the appearance of metastable phases are achieved. By solidifying and molding a rapidly solidified powder with such excellent structural characteristics under an appropriate process, new mechanical properties such as strength, toughness, heat resistance, and wear resistance, as well as physical properties such as electromagnetic properties, can be obtained. It is possible to create a material powder compact.
【０００５】上記のような急冷凝固粉末を得るために、
現在各種の製造法が研究されているが、その内、実験室
規模だけでなく、大量生産にも適した方法として遠心力
噴霧法が先ず第一に挙げられる。In order to obtain the rapidly solidified powder as described above,
Currently, various manufacturing methods are being researched. Among them, the centrifugal force spraying method is the first method suitable not only for laboratory scale but also for mass production.
【０００６】この遠心力噴霧法の概略は図１に示すよう
であり、その原理は以下のようである。すなわち、真空
あるいは不活性ガス中で溶解された金属あるいは合金の
溶湯８を高速で回転する円盤５の上へ噴出させ、溶湯に
遠心力を付与して円盤の外周端より細い液滴として飛散
させるものである。飛散中の微小液滴は急冷用のガス９
によって急速に凝固される。The outline of this centrifugal force spraying method is as shown in FIG. 1, and its principle is as follows. That is, a metal or alloy melt 8 melted in a vacuum or an inert gas is jetted onto a disk 5 rotating at high speed, and a centrifugal force is applied to the melt to scatter as droplets thinner than the outer peripheral edge of the disk. It is a thing. The minute droplets that are flying are the gas for quenching 9
Is rapidly solidified by.
【０００７】遠心力噴霧法における粉末製造のプロセス
は上記のようにしてなされるため、製造条件に関する主
な因子には溶湯温度、溶湯噴出量、溶湯噴出位置、回転
円盤の材質と形状、回転数、急冷用ガスの種類と流量、
ならびに溶解・噴霧の雰囲気等がある。Since the powder manufacturing process in the centrifugal spraying method is performed as described above, the main factors relating to the manufacturing conditions are the melt temperature, the melt injection amount, the melt injection position, the material and shape of the rotating disk, and the rotation speed. , Type and flow rate of quenching gas,
There is also a melting / spraying atmosphere.
【０００８】中でも回転円盤に関する因子は、噴出され
た溶湯が回転円盤から離脱する噴霧挙動に大きな影響を
与える。円盤上に噴出された溶湯は円盤周端部へ円盤の
回転によって移動するが、その間、円盤によって冷却さ
れる。この冷却の程度が大きいと溶湯が円盤上で一部凝
固し、円盤上に凝固層を形成することになる。これを防
止するためには、遠心力噴霧装置に円盤を加熱するため
の装置を設置する必要があるが、装置が複雑になるなど
の理由で加熱装置は設置されていないのが一般的であ
る。そのため、前記のように円盤上には過大な凝固層が
形成され、正常な噴霧が行われなくなる。これが出発原
料に対する製造される粉末の重量割合、すなわち粉末歩
留りを低下させる原因になっていた。Among them, the factors related to the rotating disk have a great influence on the spraying behavior of the molten metal ejected from the rotating disk. The molten metal jetted onto the disk moves to the peripheral edge of the disk due to the rotation of the disk, but is cooled by the disk during that time. If the degree of this cooling is large, the molten metal will partially solidify on the disk, forming a solidified layer on the disk. In order to prevent this, it is necessary to install a device for heating the disk in the centrifugal spray device, but it is common that no heating device is installed because the device becomes complicated. . Therefore, as described above, an excessively solidified layer is formed on the disk, and normal spraying cannot be performed. This has been a cause of lowering the weight ratio of the manufactured powder to the starting material, that is, the powder yield.
【０００９】[0009]
【発明が解決しようとする課題】本発明の技術的課題
は、遠心力噴霧法によって製造される急冷凝固粉末の歩
留りを恒常的に１００％近くまで向上させることであ
る。SUMMARY OF THE INVENTION The technical problem of the present invention is to constantly improve the yield of rapidly solidified powder produced by the centrifugal atomization method to nearly 100%.
【００１０】[0010]
【課題を解決するための手段、作用】上記課題を解決す
るために、本発明者は、鋭意研究を重ねた結果、粉末の
歩留りに最も大きな影響を与える因子は回転円盤の材質
と形状、および回転円盤の半径方向に対する溶湯の噴出
位置であることを見い出し、これらについて詳細な検討
を加えることによって、粉末歩留りの大幅な向上を達成
した。以下、本発明の内容を詳細に説明する。In order to solve the above problems, the present inventor has conducted earnest studies, and as a result, the factors that most affect the yield of powder are the material and shape of the rotating disk, and By discovering the position of the molten metal jetting in the radial direction of the rotating disk and making detailed investigations on these positions, a significant improvement in powder yield was achieved. Hereinafter, the content of the present invention will be described in detail.
【００１１】遠心力噴霧法における溶湯の噴霧において
重要な点は前述の如く、円盤上での溶湯の温度低下を極
力抑制することである。そのためには円盤材質として熱
伝導率および熱容量が小さいことが必須条件である。ま
た円盤の回転を噴出された溶湯に伝え、遠心力を付与さ
せるために円盤と溶湯とは濡れ性を有していることも非
常に重要な点である。回転円盤に要求されるその他の特
性としては、高速回転させるため、軸受部の負担が軽
減されるよう、円盤が軽量であること、溶湯温度に耐
えるだけの耐熱性および耐熱衝撃性を有すること、遠
心引張破壊に耐え得る機械的強度を有すること、溶湯
との化学反応を生じないこと、が挙げられる。As described above, the important point in spraying the molten metal in the centrifugal spraying method is to suppress the temperature drop of the molten metal on the disk as much as possible. For that purpose, it is an essential condition that the disk material has small thermal conductivity and heat capacity. It is also very important that the disk and the molten metal have wettability so that the rotation of the disk is transmitted to the jetted molten metal and centrifugal force is applied. Other characteristics required for the rotating disk are that the disk is lightweight, has sufficient heat resistance and thermal shock resistance to withstand the temperature of the molten metal, so that the load on the bearing is reduced in order to rotate at high speed. It has a mechanical strength that can withstand centrifugal tensile fracture and does not cause a chemical reaction with the molten metal.
【００１２】上記の回転円盤に要求される諸特性を一種
の回転円盤材料で満足することは非常に困難である。そ
のため、これまでの遠心力噴霧法による粉末の歩留りは
最高で５０〜６０％に過ぎなかった。例えば、黒鉛は真
空あるいは不活性ガス中では、優れた耐熱性と耐熱衝撃
性を有している。また高密度黒鉛材料は円盤が高速回転
することによって生じる遠心引張応力にも耐え得る強度
を有するとともに、他材料に比して軽量であり、さらに
は機械加工性にも優れ、任意形状の円盤を容易に製作で
きる利点を有する。しかし、黒鉛の熱伝導率は金属と同
等あるいはそれ以上に高く、また亜鉛合金、アルミニウ
ム合金、銅合金に対しては比較的濡れにくいという特性
を有する。It is very difficult to satisfy the above-mentioned various characteristics required for the rotating disk with a kind of rotating disk material. Therefore, the maximum yield of powder by the centrifugal atomization method so far was only 50 to 60%. For example, graphite has excellent heat resistance and thermal shock resistance in vacuum or in an inert gas. In addition, the high-density graphite material has the strength to withstand the centrifugal tensile stress generated by the high-speed rotation of the disc, is lighter than other materials, and is excellent in machinability. It has an advantage that it can be easily manufactured. However, the thermal conductivity of graphite is as high as or higher than that of metal, and it has characteristics that it is relatively hard to wet zinc alloy, aluminum alloy, and copper alloy.
【００１３】そのため、円盤の表面形状がフラット型の
黒鉛製円盤を亜鉛合金やアルミニウム合金粉末の製造に
用いる場合、製造される粉末は粒状粉末以外にアスペク
ト比の大きい繊維状の箔片が多く見受けられる。この原
因は黒鉛に対してこれらの溶湯が十分な濡れ性を有しな
いために円盤の回転が溶湯に十分に伝わらず、円盤上で
溶湯のすべりが生じること、および黒鉛の高い熱伝導率
のため、溶湯が黒鉛製円盤上ですべったままの状態で、
一部凝固したためである。Therefore, when a graphite disk having a flat disk surface shape is used for the production of zinc alloy or aluminum alloy powder, the produced powder is often a fibrous foil piece having a large aspect ratio in addition to the granular powder. To be This is because these melts do not have sufficient wettability with graphite, so the rotation of the disk does not transfer to the melt sufficiently, causing slippage of the melt on the disk, and the high thermal conductivity of graphite. , With the molten metal slipping on the graphite disk,
This is because it partially solidified.
【００１４】本発明においては、耐熱性に優れる金属の
薄板を、円盤上面がフラット型の回転円盤として用い、
これを回転円盤受台へ設置するにあたっては、該円盤と
受台との間に空間を設ける、あるいは低熱伝導率の物
質、例えばセラミックス等を介して行う。本発明方法に
おける回転円盤の模式的断面図を図２に示す。更に、溶
湯の噴出位置を円盤の中心から半径方向に任意距離だけ
偏心させた箇所とすることを特徴とする。In the present invention, a thin metal plate having excellent heat resistance is used as a rotary disc having a flat disc upper surface,
When this is installed on the rotary disk pedestal, a space is provided between the disk and the pedestal, or a substance having a low thermal conductivity such as ceramics is used. A schematic cross-sectional view of the rotating disk in the method of the present invention is shown in FIG. Further, it is characterized in that the molten metal is spouted at a position eccentric from the center of the disk by an arbitrary distance in the radial direction.
【００１５】回転円盤を金属の薄板にすることによっ
て、以下に示す回転円盤としての利点が生じる。すなわ
ち、金属は非金属材料に比してその熱伝導率は一般に大
きいが、薄板にすることによって、その熱容量は小さく
なる。したがって噴出された溶湯の熱による円盤の温度
上昇は容易になり、短時間の内に溶湯温度と同程度にま
で上昇する。高温下にある固体金属と溶湯との濡れ性は
非金属基板の場合に比較して非常に良好である。更に、
金属は耐熱衝撃性は十分にあり、熱衝撃で破壊すること
は全くない。また、薄板にすることによって円盤の軽量
化が達成される。円盤表面の形状がフラットであるので
加工も容易である。The use of a thin metal plate as the rotating disk brings about the following advantages as the rotating disk. That is, the heat conductivity of metals is generally higher than that of non-metal materials, but the heat capacity of metals is reduced by making them thin. Therefore, the temperature of the disk is easily increased by the heat of the molten metal that is ejected, and the temperature rises to the same level as the molten metal temperature in a short time. The wettability between the solid metal and the molten metal under high temperature is very good as compared with the case of the non-metal substrate. Furthermore,
Metal has sufficient thermal shock resistance, and is never destroyed by thermal shock. In addition, the weight of the disk can be reduced by using a thin plate. Since the shape of the disk surface is flat, it is easy to process.
【００１６】このように、金属薄板を回転円盤として用
いることによって、前述の回転円盤が具備すべき条件の
ほぼ全てを満足できることになる。次に、本発明のもう
一つの特徴である回転円盤に対する溶湯の噴出位置につ
いて述べる。本発明においては、溶湯の噴出位置は回転
円盤の中心ではなく、半径方向に、ある任意距離だけず
らした箇所を特徴としている。As described above, by using the metal thin plate as the rotary disk, it is possible to satisfy almost all the conditions that the rotary disk should have. Next, the spouting position of the molten metal on the rotating disk, which is another feature of the present invention, will be described. The present invention is characterized in that the position where the molten metal is ejected is not the center of the rotating disk but is a position displaced in the radial direction by an arbitrary distance.
【００１７】回転円盤上に噴出された溶湯は円盤の回転
を受けて円盤外周部へと移動するが、円盤および円盤上
の溶湯は、周囲の急冷凝固用ガスによって冷却されるた
め、円盤外周部への移動に伴って溶湯温度は低下する。
この温度低下が著しいと溶湯が一部固液共存状態にな
り、溶湯の粘性低下をきたしたり、更には固相線以下に
なるなどして、回転円盤上に次々と過大な凝固層を形成
することになる。溶湯の噴出位置を回転円盤の中心にす
ると、例え、金属薄板を回転円盤として用い、その熱容
量を小さくして円盤温度を噴出された溶湯の温度と同程
度にした場合においても円盤の外周部にいくにしたがっ
て溶湯温度の低下が生じ、過大な凝固層が不規則に円盤
上に形成される。円盤がこのような形状になると、もは
や安定で且つ正常な噴霧は得がたく、粉末歩留りの低下
を来たすことになる。The molten metal jetted onto the rotating disc moves to the outer peripheral portion of the disc upon rotation of the disc, but the molten metal on the disc and the disc is cooled by the surrounding gas for rapid solidification, so that the outer peripheral portion of the disc is cooled. The temperature of the molten metal decreases as it moves to.
If this temperature drop is remarkable, the molten metal partly enters the solid-liquid coexisting state, which causes the viscosity of the molten metal to drop, and even below the solidus line, forming excessive solidified layers one after another on the rotating disk. It will be. When the position of the molten metal spouting is at the center of the rotating disc, even if a thin metal plate is used as the rotating disc and its heat capacity is reduced to make the disc temperature about the same as the temperature of the spouted molten metal, it will still be on the outer periphery of the disc. As the melt temperature decreases, an excessively large solidified layer is irregularly formed on the disk. When the disk has such a shape, stable and normal spraying cannot be obtained any more, and the powder yield is lowered.
【００１８】これまでの一般的な遠心力噴霧法では、溶
湯の噴出は回転円盤の中心に行うというのが、半ば常識
化され、その結果、円盤上に噴出された溶湯の一部は円
盤上に過大な凝固層を形成し、これが回転円盤のバラン
スを損なったり、過度に成長した凝固層が円盤上から非
常な高速で離脱して、粉末製造室に衝突するなどのトラ
ブルの原因となるとともに、粉末の歩留りの低下を来た
していた。In the conventional general centrifugal spraying method up to now, it has been made common sense that the molten metal is spouted at the center of the rotating disk. As a result, a part of the molten metal spouted on the disk is placed on the disk. An excessively large solidified layer is formed on the disk, which may impair the balance of the rotating disk, or cause the excessively grown solidified layer to separate from the disk at a very high speed, causing collisions with the powder manufacturing chamber. , The yield of the powder was decreasing.
【００１９】そこで本発明においては、円盤上への過大
な凝固層の形成を阻止するために、回転円盤に対する溶
湯の噴出位置を円盤中心ではなく、円盤の半径方向に偏
心させることを特徴とする。噴出された溶湯が円盤周端
部へ移動する距離およびそれに要する時間を短くするこ
とによって、溶湯の温度低下を抑制するためである。こ
のように溶湯噴出位置を円盤中心ではなく半径方向に偏
心させると、円盤上には過大な凝固層は形成されず、溶
湯噴出の最初から最後までの全期間を通じて溶湯は回転
円盤の周囲からほぼ水平方向に飛散する安定した正常な
噴霧が達成できる。これによって粉末歩留りを飛躍的に
向上させることができる。Therefore, in the present invention, in order to prevent the formation of an excessively solidified layer on the disk, the spouting position of the molten metal with respect to the rotating disk is decentered not in the disk center but in the radial direction of the disk. . This is because the temperature drop of the molten metal can be suppressed by shortening the distance that the jetted molten metal moves to the peripheral edge of the disk and the time required for it. If the molten metal ejection position is eccentrically in the radial direction instead of the center of the disc, an excessive solidified layer will not be formed on the disc, and the molten metal will be distributed from the periphery of the rotating disc throughout the entire period from the beginning to the end of the molten metal ejection. A stable and normal spray that scatters horizontally can be achieved. This can dramatically improve the powder yield.
【００２０】[0020]
【実施例１】各種アルミニウム合金の中でも非常に優れ
た耐食性、とりわけ顕著な耐海水性を有するとともに、
室温下では５００ＭＰａ級の高強度、３００〜４００℃
の温度域においては超塑性現象を示すことが期待される
Ａｌ−１０Ｍｇ合金の急冷凝固粉末を本発明方法によっ
て製造した。すなわち、耐熱性に富むモリブデン製の、
厚さが１ｍｍの薄板をフラット型回転円盤として用い
た。該円盤の直径は７０ｍｍφ、回転数は１８,０００
ｒｐｍとした。一方、溶湯の噴出は該円盤の中心より半
径方向に１０ｍｍ偏心した位置に、ノズル径２.５ｍｍ
φを通じて溶湯の自重落下方式により行った。なお、溶
湯温度は８００℃であり、該円盤により噴霧された微細
液滴の急冷凝固はヘリウムガスによって行った。これら
の一連の工程は不活性ガスで置換された粉末製造室の中
で行われた。Example 1 Among various aluminum alloys, it has very excellent corrosion resistance, particularly remarkable seawater resistance,
High strength of 500 MPa at room temperature, 300 to 400 ° C
A rapidly solidified powder of Al-10Mg alloy, which is expected to exhibit a superplastic phenomenon in the temperature range of 1, was manufactured by the method of the present invention. That is, made of molybdenum with high heat resistance,
A thin plate having a thickness of 1 mm was used as a flat type rotating disk. The diameter of the disk is 70 mmφ and the rotation speed is 18,000.
rpm. On the other hand, the molten metal was ejected at a position eccentric to the center of the disk in the radial direction by 10 mm and the nozzle diameter was 2.5 mm
It was carried out by the self-weight drop method of the molten metal through φ. The molten metal temperature was 800 ° C., and the rapid solidification of the fine droplets sprayed by the disc was performed with helium gas. These series of steps were carried out in a powder manufacturing chamber which was purged with an inert gas.
【００２１】上記、本発明方法による粉末製造によっ
て、１００％にほぼ近い９０％以上の粉末歩留りを得る
ことができた。By the above-mentioned powder production by the method of the present invention, a powder yield of 90% or more, which is close to 100%, could be obtained.
【００２２】図３は粉末製造後の回転円盤の外観を示し
た写真である。円盤上には極く薄い凝固膜が形成され、
円盤上に噴出された溶湯が、円盤の回転を受けて円盤の
外周端へ移動し、外周端からその遠心力でもって飛散し
たことを示す痕跡が明瞭に認められる。FIG. 3 is a photograph showing the appearance of the rotating disk after powder production. An extremely thin solidified film is formed on the disk,
The traces indicating that the molten metal ejected onto the disk moved to the outer peripheral edge of the disk due to the rotation of the disk and was scattered by the centrifugal force from the outer peripheral edge are clearly recognized.
【００２３】また、別に行ったビデオテープレコーダに
よる噴霧状況の記録によっても、噴出された溶湯は回転
円盤からはね上ることなく、ほぼ水平方向に安定して飛
散する、良好な噴霧がなされていることが確認された。Also, according to a separate recording of the spraying condition by the video tape recorder, the sprayed molten metal does not splash from the rotating disk and is stably sprayed in a substantially horizontal direction. It was confirmed.
【００２４】[0024]
【実施例２】耐摩耗性、低熱膨張率、高強度等の面で優
れた機械的性質を有し、自動車産業を中心として、多く
の需要が見込まれるＡｌ−２５Ｓｉ系急冷凝固粉末を本
発明方法により製造した。各種の粉末製造条件は溶湯温
度を９２０℃とした点を除いて、実施例１に同じであ
る。Example 2 The present invention is an Al-25Si-based rapidly solidified powder having excellent mechanical properties in terms of wear resistance, low coefficient of thermal expansion, high strength, etc., which is expected to be in great demand mainly in the automobile industry. Manufactured by the method. Various powder production conditions were the same as in Example 1 except that the molten metal temperature was 920 ° C.
【００２５】図４は粉末製造後の回転円盤の外観を示し
た写真であるが、図３の場合と同様、粉末製造後の円盤
上には非常に薄い凝固膜が形成され、溶湯が遠心力によ
って円盤外周端へ移動し、そこから飛散していることが
分かる。噴霧状況を記録したビデオ観察の結果によって
も、実施例１の場合と同様、安定した良好な噴霧が溶湯
噴出の全期間を通じてなされた。本実施例２における粉
末歩留りは８０％以上であった。FIG. 4 is a photograph showing the appearance of the rotating disk after the powder is manufactured. As in the case of FIG. 3, a very thin solidified film is formed on the disk after the powder is manufactured, and the molten metal is subjected to centrifugal force. It can be seen that it moves to the outer edge of the disk and is scattered from there. As in the case of Example 1, stable and good spraying was performed throughout the molten metal ejection period, as in the case of Example 1, based on the results of video observation recording the spraying state. The powder yield in Example 2 was 80% or more.
【００２６】[0026]
【比較例】本比較例では回転円盤に対する溶湯の噴出位
置の影響を比較調査することを目的に、円盤中心への溶
湯噴出を行い、粉末製造後の回転円盤上に形成される凝
固層ならびに粉末の歩留りに注目した。対象とした合金
粉末は実施例２と同じ、Ａｌ−２５Ｓｉ系急冷凝固粉末
である。[Comparative Example] In this comparative example, for the purpose of comparatively investigating the influence of the position of the molten metal ejected on the rotating disc, the molten metal was ejected to the center of the disc, and the solidified layer and the powder formed on the rotating disc after the powder production I paid attention to the yield. The alloy powder used was the same as in Example 2, which was an Al-25Si-based rapidly solidified powder.
【００２７】図５はその粉末製造後の回転円盤の外観を
表している。円盤上には過大な凝固層が形成され、その
厚さは円盤の外周に行くのに伴って増加し、あたかも
“すり鉢”のようになっている。円盤上にこのような不
規則な凝固層が形成されると、円盤の回転バランスが損
なわれることはもとより、円盤上に噴出された溶湯は、
円盤から上へ跳ねあげられるなどの不規則な動きをす
る。そのようなため、この場合の粉末歩留りは６０％程
度に低下した。FIG. 5 shows the appearance of the rotating disk after the powder production. An excessive solidified layer is formed on the disk, and its thickness increases as it goes to the outer circumference of the disk, as if it were a "mortar". When such an irregular solidified layer is formed on the disk, not only the rotational balance of the disk is impaired, but the molten metal spouted on the disk is
It makes irregular movements such as jumping up from the disk. Therefore, the powder yield in this case was reduced to about 60%.
【００２８】この比較例が示すように、溶湯の噴出位置
もまた、溶湯の噴霧挙動に大きな影響を与える重要な因
子であり、本発明方法の有用性が本比較例によって確認
された。As shown in this comparative example, the position where the molten metal is ejected is also an important factor that greatly affects the spraying behavior of the molten metal, and the usefulness of the method of the present invention was confirmed by this comparative example.
【００２９】[0029]
【発明の効果】以上に詳述したように、本発明の方法に
よれば、高付加価値の急冷凝固粉末を、高い歩留りの下
で製造できるので、その経済的効果は大きい。更に、特
殊な円盤材料を用いることなく、市販されている汎用の
金属薄板を回転円盤として用い得るので、簡便、且つ経
済的である。As described above in detail, according to the method of the present invention, a rapidly added solidified powder having a high added value can be produced with a high yield, and therefore the economical effect thereof is great. Further, since a commercially available general-purpose metal thin plate can be used as the rotating disk without using a special disk material, it is simple and economical.
【図１】遠心力噴霧法の概要を説明するための模式的断
面図である。FIG. 1 is a schematic cross-sectional view for explaining an outline of a centrifugal spray method.
【図２】本発明方法における金属薄板による回転円盤の
模式的断面図である。FIG. 2 is a schematic cross-sectional view of a rotating disk made of a thin metal plate in the method of the present invention.
【図３】実施例１における粉末製造後のモリブデン薄板
製回転円盤の外観を示す写真である。3 is a photograph showing the appearance of a molybdenum thin plate rotary disk after powder production in Example 1. FIG.
【図４】実施例２における粉末製造後のモリブデン薄板
製回転円盤の外観を示す写真である。FIG. 4 is a photograph showing the appearance of a molybdenum thin plate rotary disk after powder production in Example 2.
【図５】比較例における粉末製造後のモリブデン薄板製
回転円盤の外観を示す写真である。FIG. 5 is a photograph showing the appearance of a molybdenum thin plate rotary disk after powder production in a comparative example.
１ 粉末製造室 ２ るつぼ ３ 加熱ヒーター（高周波加熱コイル） ４ ノズル ５ 回転円盤 ６ 高速回転モーター ７ 溶湯噴出用ガス ８ 金属溶湯 ９ 急冷凝固用ガス １０ 金属薄板製回転円盤 １１ 低熱伝導材料 1 Powder Manufacturing Room 2 Crucible 3 Heating Heater (High Frequency Heating Coil) 4 Nozzle 5 Rotating Disk 6 High Speed Rotating Motor 7 Gas for Molten Metal Injection 8 Metal Melt 9 Gas for Rapid Solidification 10 Rotating Disk Made of Metal Sheet 11 Low Thermal Conductivity Material
Claims (3)
溶湯温度に耐え得る耐熱性を有する金属薄板を用いるこ
とを特徴とする急冷凝固粉末の製造方法。1. A rotating disk in the centrifugal atomization method,
A method for producing a rapidly solidified powder, which comprises using a metal thin plate having heat resistance capable of withstanding a molten metal temperature.
を回転円盤受台に設置するにあたり、両者間に空間を設
けて、あるいは該円盤の下部側に低熱伝導率の物質を介
して設置することを特徴とする急冷凝固粉末の製造方
法。2. The method according to claim 1, wherein when the disk is installed on a rotary disk pedestal, a space is provided between the disks, or a material having a low thermal conductivity is placed on the lower side of the disk. A method for producing a rapidly solidified powder, which comprises:
おいて、溶湯の噴出位置を該円盤の半径方向に偏心させ
ることを特徴とする急冷凝固粉末の製造方法。3. The method for producing a rapidly solidified powder according to claim 1 or 2, wherein the molten metal jetting position is eccentric in the radial direction of the disk.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9704693A JPH07145408A (en) | 1993-03-30 | 1993-03-30 | Production of rapidly solidified powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9704693A JPH07145408A (en) | 1993-03-30 | 1993-03-30 | Production of rapidly solidified powder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07145408A true JPH07145408A (en) | 1995-06-06 |
Family
ID=14181697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9704693A Pending JPH07145408A (en) | 1993-03-30 | 1993-03-30 | Production of rapidly solidified powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07145408A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001068297A3 (en) * | 2000-03-13 | 2002-06-20 | Sanei Kasei Co Ltd | Metal powder with nano-composite structure and its production method using centrifugal force |
| JP2013119663A (en) * | 2011-12-09 | 2013-06-17 | Ducol:Kk | Rotary disk, method for producing silver powder by centrifugal atomization process, and centrifugal atomization device |
| CN115070036A (en) * | 2022-06-30 | 2022-09-20 | 河南科技大学 | Water-cooled cooling centrifugal disc for centrifugal injection molding |
| CN117182088A (en) * | 2023-10-10 | 2023-12-08 | 西藏智材新材料有限公司 | High-fluidity aluminum alloy powder and acquisition method thereof |
| CN119187582A (en) * | 2024-10-10 | 2024-12-27 | 四川赢圭科技有限公司 | Centrifugal forming device and metal powder forming system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59110705A (en) * | 1982-12-15 | 1984-06-26 | Toshiba Corp | Centrifugal spray apparatus for preparing powder |
| JPH02290907A (en) * | 1989-04-28 | 1990-11-30 | Showa Denko Kk | Method and apparatus for manufacturing solder fine powder |
-
1993
- 1993-03-30 JP JP9704693A patent/JPH07145408A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59110705A (en) * | 1982-12-15 | 1984-06-26 | Toshiba Corp | Centrifugal spray apparatus for preparing powder |
| JPH02290907A (en) * | 1989-04-28 | 1990-11-30 | Showa Denko Kk | Method and apparatus for manufacturing solder fine powder |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001068297A3 (en) * | 2000-03-13 | 2002-06-20 | Sanei Kasei Co Ltd | Metal powder with nano-composite structure and its production method using centrifugal force |
| JP2013119663A (en) * | 2011-12-09 | 2013-06-17 | Ducol:Kk | Rotary disk, method for producing silver powder by centrifugal atomization process, and centrifugal atomization device |
| CN115070036A (en) * | 2022-06-30 | 2022-09-20 | 河南科技大学 | Water-cooled cooling centrifugal disc for centrifugal injection molding |
| CN115070036B (en) * | 2022-06-30 | 2023-08-18 | 河南科技大学 | Water-cooled cooling centrifugal disc for centrifugal spray forming |
| CN117182088A (en) * | 2023-10-10 | 2023-12-08 | 西藏智材新材料有限公司 | High-fluidity aluminum alloy powder and acquisition method thereof |
| CN119187582A (en) * | 2024-10-10 | 2024-12-27 | 四川赢圭科技有限公司 | Centrifugal forming device and metal powder forming system |
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