Patent ID: 7510608

Claim:
A hard coating film which has a composition represented by the formula (3a) below: (Cr (1-p-q-r) Al p Zr q Hf r )(C (1-z) N z )â€ƒâ€ƒ(3a), where each subscript denotes the atomic ratio specified below, with either of q and r possibly being 0, and where when p<0.5: 0.2 â‰¦p< 0.5, 0.2â‰¦( q+r )â‰¦0.5, 0.05â‰¦(1- p - q - r ), and 0.5 â‰¦zâ‰¦ 1; and when pâ‰§0.5: 0.5 â‰¦pâ‰¦ 0.7, 0.05â‰¦( q+r )â‰¦0.25, 0.15â‰¦(1- p - q - r ), and 0.5 â‰¦zâ‰¦ 1.