粉末成形とその周辺技術　　金属粉および磁性粉の圧縮成形・加工に関する研究

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  • Study of Compaction and Forming of Metallic/Magnetic Powders.
  • ジュショウ キネン コウエン ヘイセイ 12ネンド ケンキュウ コウセキショウ キンゾクフン オヨビ ジセイフン ノ アッシュク セイケイ カコウ ニ カンスル ケンキュウ

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This paper reviews the researches in powder forming which were carried out by the author. In the compaction and forming of metal powders, first a compaction criterion in a stress state such that σ2=σ3 was obtained; this gives a relation between principal stresses and density of the green compact. Next, by using the results obtained from the cold forgeability of sintered iron, a ductile fracture criterion for porous metals was proposed. The formation process of joint strength<BR>in the infiltration joining was made clear. Furthermore, rapidly solidifying superplastic powder was prepared by centrifugal atomization method.<BR>In the forming processing of magnetic powders, meantime, a new type of composite magnetic material was fabricated by combination with electro-magnetic properties of ferrite powder and the superplastic properties of Zn-22Al alloyed powder. To improve the magnetic characteristics of the permanent magnets, orientation forming of magnetic powders mixed with a MIM binder was attempted and a new orientation forming process was proposed. Moreover, for the purpose of producing ferrite part with a complicate shape which has different alignment of the ferrite crystallites, the feasibility of combined sinter joining method was carried out. As another application of combined sinter joining, a stainless steel-permalloy composite was fabricated and the forming conditions to give sufficiently high joint strength to it were found.

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