PRODUCTION OF COMPACTED AND SINTERED BODY OF HIGH MELTING POINT METAL POWDER

PURPOSE: To inexpensively and surely produce a dense compacted and sintered body having high density by subjecting high m.p. metal powder to HIP treatment at a low temp. via a secondary pressure medium of ceramics powder and there after directly executing HIP treatment at a high temp. CONSTITUTION: High m.p. metal powder is filled into a ceramics mold having a prescribed shape and is housed in an inexpensive metallic capsule of an iron series or the like easy to work. Next, ceramics powder is filled into the space between the mold and capsule as a secondary pressure medium. This capsule is deaerated, is thereafter subjected to sealing treatment and is subjected to primary HIP treatment at a prescribed temp. or below, e.g., =95%. After that, the capsule and ceramics powder are removed, and the primary sintered body is subjected to secondary HIP treatment at a temp. higher than the primary HIP treating temp., e.g at about 1600 to 2000 deg.C without being charged into the capsule to obtain the compacted and sintered body.