Methods are producing composite materials of metal matrix containing tungsten grain

摘要

A composite material comprising a metal matrix containing tungsten grain isroduced from tungsten powders formed by plasma rapid solidification. The powders comprise tungsten and up to 20 weight percent of a metal selected from the group consisting of molybdenum, tantalum, niobium, rhenium, and chromium. The surfaces of the powders are cleaned to reduce the surface oxide thereon, and the powders are coated with at least one metal selected from the group consisting of copper, nickel, cobalt, hafnium and tantalum. The coated powders are formed into a sintered preform which is less than fully dense, and the sintered preform is further consolidated to full density by a technique selected from hot isostatic pressing, rapid omin-directional compaction, and hot extrusion.