| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for obtaining a fine grained cemented carbide structure by performing sintering at least partly in a nitrogen-containing atmosphere. SOLUTION: There is provided a method of making a fine grained tungsten carbide-cobalt cemented carbide comprising mixing, milling, and press-forming according to the conventional powder metallurgical method, and successively, the nitrogen is introduced into the sintering atmosphere at the pressure of≥0.5 atm during applying the sintering treatment after dewaxing but before pore closure. In this way, a grain refinement including reduced grain size and less abnormal grain can be obtained. COPYRIGHT: (C)2005,JPO&NCIPI
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