| 摘要 |
The present invention provides an excellent cubic boron nitride ultrahigh pressure sintering material surface coated cutting tool with resistance to cracking. The surface coated cutting tool of the present invention is coated with a hard coating layer comprised by (Ti1-XA1X)N ( wherein, 0.30<=X<=0.75 in atomic ratio), wherein, the surface region of a rake face and a cutting edge grinding face are comprised by composite nitride grains, Ti and A1. The crystal grain size along the direction parallel with a substrate surface in the Ti and A1 composite nitride grains is 0.08-0.5 [mu]m, and the asper ratio, the transversal length of which is parallel with the substrate surface, is that the grains from 1-6 is in the proportion greater than 90%, at the other end, the hard coating layers of the surface area's bottom and the flank are comprised by the Ti and A1 composite nitride grains of a columnar crystal. Moreover, the diffracted intensity based on the XRD is I(200) and I(111, the optimal rake face is 3<I<(200)/I(111),5, and the flank is I(200)/I(111)<3. |
