Patent ID: 9624569
Date: 2017-04-18
CPC Classifications: C04B,C23C,H01J

Claim:
1. A hard film whose composition formula satisfies M 1-a-b C a N b , wherein the M is (i) at least one element selected from the group consisting of Ti, Cr and Al, or (ii) at least one element selected from the group consisting of Ti, Cr and Al, in combination with at least one element selected from the group consisting of a Group 4 element except for Ti, a Group 5 element, a Group 6 element except for Cr, Si, Y and a rare earth element, with the proviso that M is Ti and M is a combination of Ti and Cr are excluded, wherein atomic ratios of M, C and N satisfy 0.01≦a≦0.50, 0.10≦b≦0.50 and 0<1-a-b, and a ratio y of C to C bonding to all C bonding in the film is 0.20 or more.