| 摘要 |
PROBLEM TO BE SOLVED: To provide a cemented carbide with a gradient structure capable of attaining the remarkable improvement of practical performance and the expansion of uses by simultaneously improving the hardness, wear resistance, toughness and chipping resistance in the vicinity of its surface, and to provide its production method. SOLUTION: In the production method, dispersed phase forming powder composed of at least one kind selected from the oxide of titanium, zirconium, hafnium, vanadium and chromium is added to the starting raw material of a cemented carbide with a gradient structure so as to be heated and held in a gaseous CO atmosphere to uniformize its structure, and thereafter, the atmosphere is changed into a vacuum, by which the oxide-dispersed phase in the vicinity of the surface is decomposed/carbonized to convert its structure into the gradient one. COPYRIGHT: (C)2005,JPO&NCIPI
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