PRODUCTION OF REGENERATED TUNGSTEN - COBALT RAW POWDER FROM CEMENTED CARBIDE SCRAP, AND PRODUCTION OF TANGSTEN BASE SINTERED HEAVY ALLOY OBTAINED BY THIS PRODUCTION

摘要

PROBLEM TO BE SOLVED: To obtain a regenerated W-Co raw powder from a WC-Co base cemented carbide alloy scrap at a low cost. SOLUTION: After oxidizing the WC-Co base cemented carbide alloy scrap in an oxidizing atmosphere at =600 deg.C, a primary pulverizing is executed to obtain oxidized raw powder. Successively, after reducing this oxidized raw powder into the W-Co powder in a hydrogen-containing reducing atmosphere at 600-1000 deg.C, a secondary pulverizing is executed to obtain pulverized fine powder, and the regenerated W-Co raw powder is obtd. Since this treatment to generate the cemented carbide alloy scrap can be simplified without executing such complicated chemical or metallurgical processes as various treating methods conventionally executed, the high quality pulverized fine powder can easily and efficiently be obtd. at a low cost in the industrial mass-production scale.