| US 7,601,440 B2 | ||
| Hard coating excellent in wear resistance and in oxidation resistance and target for forming the same | ||
| Kenji Yamamoto, Kobe (Japan) | ||
| Assigned to Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.), Kobe-shi (Japan) | ||
| Filed on Jan. 29, 2009, as Appl. No. 12/362,016. | ||
| Application 12/362016 is a division of application No. 11/237798, filed on Sep. 29, 2005, granted, now 7,521,131. | ||
| Claims priority of application No. 2004-288042 (JP), filed on Sep. 30, 2004; and application No. 2005-246660 (JP), filed on Aug. 26, 2005. | ||
| Prior Publication US 2009/0136727 A1, May 28, 2009 | ||
| Int. Cl. B32B 9/00 (2006.01) | ||
| U.S. Cl. 428—697 [428/698; 428/699] | 4 Claims |
| 1. A hard coating excellent in wear resistance and oxidation resistance and made by stacking a layer A and a layer B that
have different compositions, wherein
the layer A is one selected from a group consisting of:
(1) a hard coating having composition of (Ala,Cr1-a)(C1-eNe) satisfying the relations:
0.25≤a≤0.7 and
0.5≤e≤1;
(2) a hard coating having composition of (Ala,Sic,Bd,Cr1-a-c-d)(C1-eNe) satisfying the relations:
0<c+d≤0.2, and
0<c+d≤0.2, and
0.5≤e≤1; and
(3) a hard coating having composition of (Ala,Sic,Bd,Ti1-a-c-d)(C1-eNe) satisfying the relations:
0.25≤a≤0.7,
0<c+d≤0.15, and
0.5≤e≤1;
(where a, c, d and e that represent atomic ratios of Al, Si, B and N, respectively)
and the layer B is a hard coating having composition of (Mb,Sic,Bd)(C1-eNe) where M represents W and/or Mo, satisfying the relations:
0.8≤b≤1, and
0≤c+d≤0.2;
(where b, c, d and e that represent atomic ratios of M, Si, B and N, respectively)
wherein the layer A and the layer B are stacked one on another so as to satisfy the following relation (1):
0.5 (nm)≤(Thickness of layer B)≤(Thickness of layer A) (1).
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