Co+Ni, Fe+Co+Ni混合超微粉の加圧焼結および焼結体の粒度と硬さ

概要

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The hot-pressing condition for complete densification of Co+Ni and Fe+Co+Ni mixed ultrafine powders (0.02μm), the average crystal grain size and hardness (Hv) of the sintered compacts were investigated, compared with the previous results on Fe, Co, Ni, Fe+Co and Fe+Ni ultrafine powders.<BR>The results obtained were as follows: (1) The lowest complete densification temperatures for Fe+Co+Ni mixed powder, for example at 400 MPa, was about 200-300 K higher than those of Fe, Co and Ni powders, and about 100K higher than Co+Ni, Fe+Co and Fe+Ni powders. (2) The minimum crystal grain size of the Co-Ni and Fe-Co-Ni sintered compacts were 0.18 and 0.12μm respectively; the crystal grain size under the same hot-pressing condition tended to decrease with the number of components, in accordance with the tendencies of both the homogenization temperature of the components and the densification temperature. (3) The maximum hard-ness of Co-Ni and Fe-Co-Ni sintered compact were about 600 and 800 Hv.
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