収束された水中衝撃波を利用した粉末衝撃固化装置の特性 : 第2報,磁性粉末の状態式と衝撃圧縮過程の数値解析(流体工学,流体機械)

概要

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Fundamental properties of a shock compaction technique of applying converged underwater shock waves have been investigated for rare earth magnet powders. The rare earth magnet made from Fe-Nd-B powder is being developed to have a high magnet performance. Usually this powder is consolidated using static high pressure and bond materials. It is very difficult to obtain over 80% magnet purity and, thus, it is difficult to achieve maximum performance. To solve this problem, shock compaction techniques involving use of explosives were tested and the results are presented here. The equation of state (EOS) of Fe-Nd-B powders is first verified by a quasi-static experiment. The applicability of the EOS is confirmed by a new shock loading test which is proposed in this paper. Both numerical simulation and experiments on the consolidation of the magnet poweders are carried out. A fine-bonded bulk with of over 96% is obtained.
社団法人日本機械学会の論文
1997-01-25