Patent ID: 8507108

Claim:
Cutting tool insert, solid end mill, or drill, comprising a substrate and a coating composed of one or more layers of refractory compounds of wherein at least one layer comprises crystalline hexagonal phase, h-(Me1,Me2)X, described with the composition Me1 a Me2 1-a X b where Me1 is Nb, and Me2 is Zr, and a>0.5 and X is N the ratio R=(at-% X)/(at-% Me1+at-% Me2) of the Me1 a Me2 1-a X b phase is between 0.5 and 1.0, and that X contains less than 30 at-% of O+B, the X-ray diffraction (XRD) pattern in at least one of θ-2θ or gracing incidence geometry from the crystalline hexagonal phase, h-(Me1,Me2)X, showing one or several of the following peaks: a h-(Me1,Me2)X (100) peak a h-(Me1,Me2)X (101) peak a h-(Me1,Me2)X (102) peak a h-(Me1,Me2)X (110) peak a h-(Me1,Me2)X (103) peak a h-(Me1,Me2)X (112) peak a h-(Me1,Me2)X (201) peak a h-(Me1,Me2)X (202) peak.