| abstract |
A kind of hard coat, the hard coat have by (Al x Ti y M z ) a N (1‑a‑b) O b The composition of expression, wherein M is at least one of Cr and Nb element, and x, y, z, a and b are to meet 0.6≤x≤0.8,0.05≤y≤0.38,0.02≤z≤0.2 respectively by atomic ratio, x+y+z=1, the number of 0.2≤a≤0.8 and 0.02≤b≤0.10, as the bond styles identified by x-ray photoelectron spectroscopy, which has M O keys, without the Al O keys more than inevitable impurity level, and the hard coat only has NaCl type structures in its X-ray diffractogram. |