| 摘要 |
PROBLEM TO BE SOLVED: To provide a coated super hard end mill in which a substrate has high toughness while maintaining the excellent wear resistance of the substrate. SOLUTION: This end mill is obtd. by physically vapor-depositing the surface of a substrate composed of cemented carbide showing a structure in which hard dispersion phase occupy 70 to 93 area%, and the balance bonding phases essentially consisting of Co with inevitable impurities by structural observation by an electron microscope, in which the hard dispersion phase is composed of coated WC obtd. by wholly coating and/or partially coating WC with a thin layer of (V, W, Cr) C, also, the average particle size is <=1.0μm, and, furthermore the contents of Co, Cr and V are controlled to 5 to 13% Co, 0.2 to 2% Cr and 0.05 to 0.3% V with a hard coating layer of a single layer of one kind among a TiC layer, a TiN layer, a TiCN layer, a (Ti, Al) C layer, a (Ti, Al) N layer and a (Ti, Al) CN layer or double layers of >= two kinds thereamong by the average layer thickness of 0.5 to 6μm.
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