| 摘要 |
PROBLEM TO BE SOLVED: To provide cut tips made of surface covering cemented carbide to provide a rigid covering layer with excellent wear resistance. SOLUTION: In cut tips made of surface covering cemented carbide, a rigid covering layer comprising a crystalline Ti compound layer consisting of one kind or two kinds selected from TiC layer, TiN layer, a TiCN layer, a Ti2O3 layer, TiCO layer, TiNO layer, and TiCNO layer, all of which are crystalline and each of which has an average layer thickness of 1-15μm,; and a free carbon dispersion amorphous Al2O3 layer with an average layer thickness of 1-8μm having a structure wherein fine free carbon is dispersed and distributed in a ratio of 1-15 wt.% on a basis metal of amorphous Al2O3 is chemically and/or physically deposited in a total average layer thickness of 5-25μm on the surface of a WC cemented carbide base metal.
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