希土類焼結磁石用原料合金の新製造方法（ストリップキャスト法）の開発

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  • Development of New Production Method (Strip-Casting Method) for Rare-Earth Magnetic Alloys
  • 受賞記念講演:平成18年度技術功績賞 希土類焼結磁石用原料合金の新製造方法(ストリップキャスト法)の開発
  • ジュショウ キネン コウエン ヘイセイ 18ネンド ギジュツ コウセキショウ キドルイ ショウケツ ジシャクヨウ ゲンリョウ ゴウキン ノ シン セイゾウ ホウホウ ストリップ キャストホウ ノ カイハツ

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説明

Nd-Fe-B magnetic materials yield many different compounds in solidification process. For this reason, conventional mold-casting method used for Sm-Co magnetic materials was not suitable for quality and productivity. To solve their problem, rapid solidification was required. To rapidly solidify the alloy melt, thin mold gap in conventional mold-casting method was tried, but it was not suitable for productivity. New production method was developed; it was mold-free and able to rapidly and uniformly solidify the alloy melt. It was devised as the method between continuous casting and single roll casting based on melt-spinning. Several conditions were tried and followed effects were acquired. Milling and sintering were improved due to microscopic and uniform constitutions. We call the method as "Strip-casting method".<BR>In this paper, constitution characteristics of alloys produced by Strip-casting and conventional mold-casting method, and the influence for production of magnet using those alloys are summarized. Transition of production and development for other products are also reported.

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