| 摘要 |
PROBLEM TO BE SOLVED: To obtain a fine-grained cemented carbide, causing no breaking when used for cutting edge and having long service life, by constituting, in a cemented carbide having hard phase and binding phase, the hard phase of a compound carbide powder prepared by compounding chromium carbide with tungsten carbide and performing grain refining. SOLUTION: In a cemented carbide having hard phase and binding phase, the hard phase is constituted materially of a compound carbide powder prepared by compounding chromium carbide with tungsten carbide and refining grain size to 1-6μm. At this time, chromium carbide is incorporated by 0.5-2.0wt.% into tungsten carbide, and the binding phase is constituted of Co and incorporated by 5-20%, and the cemented carbide contains, other than the above, inevitable impurities. By this method, the fine-grained cemented carbide, containing fine tungsten carbide grains and excellent in toughness and wear resistance, can be obtained.
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