Ni-Mo-TiC基粉末の混合・粉砕による組成変動と合金化 (微粒子粉末材料とプロセス技術<特集>)

概要

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By using the stirrer-type ball mill which is used for mechanical alloying, nickel rich Ni-Mo-Cr-Co metal powders added with titanium carbide powder were mixed and pulverized in wet condition for a total time of 120 hours. With increase in processing time, the shapes and sizes of the powder particles tended to be uniform and the contents of nickel, titanium, molybdenum, carbon and cobalt were decreased but the contents of chromium and iron were increas-ed. Especially the content of iron which was not added to the starting mixed powders increased up to a few percents.<BR>The hot-pressed specimens of the powders mixed in wet and dry condition were compared in their hardness and microstructure. In the former, fin titanium carbide particles were dispersed in nickel alloy matrix whereas in the latter, titanium carbide particles which have high hardness were extinguished to alloy with nickel and then the hardness of the latter decreased to be about 1/5 that of the former.
社団法人粉体粉末冶金協会の論文