| 摘要 |
The present invention relates to a cutting tool insert comprising a substrate and a coating. The coating is composed of one or more layers of refractory compounds of which at least one layer comprises a composite structured (TiyAlxMe1-x-y)N layer, where Me is one of the element Zr, Hf, V, Nb, Ta, Cr, Mo, W or Si, defined by: x is between 0.60 and 0.80 the ratio, R=x/(x+y), is between 0.60 and 0.85 the sum of Ti and Al subscript, S=x+y, is between 0.7 and 1.0 the co-existence of crystalline hexagonal h-AlN and cubic c-(TiyAlxMe1-x-y)N as detected by X-ray diffraction (XRD), defined by the ratio between the area of the h-AlN (100) peak at approximately 33 DEG 2&thetas; (=A(h-AlN)100) and the c-(TiyAlxMe1-x-y)N (200) peak at about 43 DEG 2&thetas; (=A(c-(Ti,Al,Me)N)200) called K, i.e. K=A(h-AlN)100/ A(c-(Ti,Al,Me)N)200, and K is >0.08 the FWHM (Full Width Half Maximum) value of the: c-(TibAlaMe1-a-b)N (200) peak < 1.4 DEG 2&thetas; h-AlN (100) peak is between 0.2 and 1.5 DEG 2&thetas;. <IMAGE> |
