| 摘要 |
A hard film and a hard film-coated material having better wear resistance and sliding performance (due to lower friction coefficients) than conventional surface coating layers, wherein the hard film includes at least one covering layer A and at least one covering layer B stacked one over the other, both having a thickness of 5 to 100 nm. The covering layer has a composition represented by the formula M(B<SUB>a</SUB>C<SUB>b</SUB>N<SUB>1-a-b</SUB>), where M denotes one or more elements selected from W, V, Mo, and Nb, and a and b denote the atomic ratio of B and C, respectively, as defined below. 0<=a<=0.3 . . . (1A), and 0<=b<=0.5 . . . (2A). Covering layer B has a composition represented by the formula Ti<SUB>1-x-y</SUB>Cr<SUB>x</SUB>Al<SUB>y</SUB>Si<SUB>z</SUB>(C<SUB>1-A</SUB>N<SUB>A</SUB>) where x, y, z, and A denote the atomic ratio of Cr, Al, Si, and N, respectively, as defined below. 0<=1-x-y<=0.5 . . . (1B), 0<=x<=0.5 . . . (2B), 0.4<=y<=0.7 . . . (3B), 0<=z<=0.15 . . . (4B), and 0.5<=A<=1 . . . (5B).
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