DIMENSIONALLY-CONTROLLED COBALT-CONTAINING PRECISION MOLDED METAL ARTICLE

摘要

Counteracting of the shrinkage normally encountered in the powder metallurgy process of moulding a mixture of spherical cobalt-containing particles (1) and thermoplastic binder, heating the resulting moulded article to degrade the binder and form a porous preform, and infiltrating the same infiltrant (19) by adding finely divided elemental iron or elemental nickel to the spherical cobalt-containing particles iron or nickel forming with other elements coating (3). In addition to improving dimensional control, the elemental powder addition increases impact strength while maintaining hardness.