A hard film for cutting tools which is composed of(Ti1?a?b?c?d, Ala, Crb, Sic, Bd) (C1?eNe)0.5?a?0.8, 0.06?b, 0?c?0.1, 0?d?0.1,0?c+d?0.1, a+b+c+d<1, 0.5?e?1(where a, b, c, and d denote respectively the atomic ratios Al, Cr, Si, and B, and e denotes the atomic ratio of N.)
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1. A hard film for cutting tools which is composed of(Ti1?a?b, Ala, Crb)(C1?eNe) 0.02?1?a?b<0.20, 0.06?b?0.20, a+b<1, 0?e?1 wherein a and b denote respectively the atomic ratios of Al, and Cr, and e denotes the atomic ratio of N. 2. The hard film for cutting tools as defined in claim 1, wherei
1. A hard film for cutting tools which is composed of(Ti1?a?b, Ala, Crb)(C1?eNe) 0.02?1?a?b<0.20, 0.06?b?0.20, a+b<1, 0?e?1 wherein a and b denote respectively the atomic ratios of Al, and Cr, and e denotes the atomic ratio of N. 2. The hard film for cutting tools as defined in claim 1, wherein the values of a and b are in the range of0.02?1?a?b<0.20, 0.65?a?0.765, 0.06?b?020, or 0.02?1?a?b?0.175, 0.765?a, 4(a?0.75)?b?0.20. 3. The hard film for cutting tools as defined in claim 1, wherein the value of e is 1.4. The hard film for cutting tools as defined in claim 1, which has the crystal structure mainly of sodium chloride structure.5. The hard film for cutting tools as defined in claim 1, wherein the sodium chloride structure is one which has the (111) plane, (200) plane, and (220) plane such that the intensity of diffracted rays from them measured by X-ray diffraction (θ?2θ method), which is denoted by I(111), I(200), and I(220), respectively, satisfies expression (1) and/or expression (2) and expression (3) given below.I(220)?I(111)??(1) I(220)?I(200)??(2) I(200)?I(111)?0.1??(3) 6. The hard film for cutting tools as defined in claim 1, wherein the sodium chloride structure is one which, when measured by X-ray diffraction (θ?2θ method) with Cu Kα line, gives the diffracted ray from the (111) plane whose angle of diffraction is in the range of from 36.5° to 38.0°.7. The hard film for cutting tools as defined in claim 6, wherein the diffracted ray from the (111) plane has a half width not larger than 1°.8. A hard film for cutting tools which is composed of(Ti1?a?b, Ala, Crb)(C1?eNe) 0.20?1?a?b<0.30, 0.60<a, 0.06?b?020, a+b<1, 0?e?1 wherein a and b denote respectively the atomic ratios of Al, and Cr, and e denotes the atomic ratio of N. 9. The hard film for cutting tools as defined in claim 8, wherein the value of e is 1.10. The hard film for cutting tools as defined in claim 8, which has the crystal structure mainly of sodium chloride structure.11. The hard film for cutting tools as defined in claim 8, wherein the sodium chloride structure is one which has the (111) plane, (200) plane, and (220) plane such that the intensity of diffracted rays from them measured by X-ray diffraction (θ?2θ method), which is denoted by I(111), I(200), and I(220), respectively, satisfies expression (1) and/or expression (2) and expression (3) given below.I(220)?I(111)??(1) I(220)?I(200)??(2) I(200)/I(111)?0.1??(3) 12. The hard film for cutting tools as defined in claim 8, wherein the sodium chloride structure is one which, when measured by X-ray diffraction (θ?2θ method) with Cu Kα line, gives the diffracted ray from the (111) plane whose angle of diffraction is in the range of from 36.5° to 38.0°.13. The hard film for cutting tools as defined in claim 12, wherein the diffracted ray from the (111) plane has a half width not larger than 1°.
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