Patent ID: 6835446
Filing Date: 2004-12-28
Classification: C23C,Y10T

Abstract:
A surface-coated cemented carbide alloy cutting tool comprising a hard coating layer and a cemented carbide alloy substrate, the hard coating layer comprising:a Ti compound layer, as a lower layer, formed by vapor deposition, having an average thickness of 0.5 to 20 &mgr;m, said Ti compound layer comprising at least one layer selected from the group consisting of a layer of a carbide of Ti, a layer of a nitride of Ti, a layer of a carbonitride of Ti, and a layer of a carbonitroxide of Ti; and an aluminum oxide layer having an average thickness of 1 to 25 &mgr;m, said aluminum oxide layer having a heat transformed &agr;-type crystal structure derived from a vapor deposited &kgr;- or &thgr;-type aluminum oxide layer and having an X-ray diffraction peak ratio of 0.1 or more, said X-ray diffraction peak ratio being a ratio of a peak intensity of a (006) plane, I(006), to a peak intensity of a (113) plane, I(113).