Hard coating, method for manufacturing same, and hard-coated article
AssigneeKobe Steel, Ltd.
InventorsMaiko Abe, Kenji Yamamoto
Life of this patent
Estimating the term…
Abstract
Disclosed is a hard coating including a chemical composition specified by formula: (TiaAlbSicRd)Ox, where R represents at least one rare-earth element; and a, b, c, d, and x are atomic ratios respectively of Ti, Al, Si, R, and O. The atomic ratios meet conditions as specified by formulae: 0.30≦a≦0.7, 0.30≦b≦0.70, 0≦c≦0.2, 0.005≦d≦0.05, a+b+c+d=1, and 0.5≦a/b<1. The atomic ratios meet a condition as specified by Formula (1) when R does not include Ce. The atomic ratios meet a condition as specified by Formula (2) when R includes Ce. The hard coating has better wear resistance as compared with conventional nitride films and oxide films. 0.8≦[x/(2a+1.5b+2c+1.5d)]≦1.2 (1) 0.8≦[x/(2a+1.5b+2c+2d)]≦1.2 (2)
Claims8
A hard coating to be disposed on or over a substrate, the hard coating comprising a chemical composition as specified by a formula:
- (TiaAlbSicRd)Ox,
- where R represents at least one rare-earth element;
- and a, b, c, d, and x are atomic ratios respectively of Ti, Al, Si, R, and O,
- wherein the atomic ratios a, b, c, and d meet conditions specified by formulae:
- 0.30≦a≦0.7;
- 0.30≦b≦0.70;
- 0≦c≦0.2;
- 0.005≦d≦0.05;
- a+b+c+d=1;
- and
- 0.5≦a/b<1,
- wherein the atomic ratios a, b, c, d, and x meet a condition as specified by Formula (1) when R does not comprise Ce, and
- wherein the atomic ratios a, b, c, d, and x meet a condition as specified by Formula (2) when R comprises Ce, where Formulae (1) and (2) are expressed as follows:
- 0.8≦[x/(2a+1.5b+2c+1.5d)]≦1.2 (1)
- 0.8≦[x/(2a+1.5b+2c+2d)]≦1.2 (2).
A hard coating to be disposed on or over a substrate, the hard coating comprising a chemical composition as specified by a formula:
- (TiaCreAlbSicRd)Ox,
- where R represents at least one rare-earth element;
- and a, e, b, c, d, and x are atomic ratios respectively of Ti, Cr, Al, Si, R, and O,
- wherein the atomic ratios a, b, c, d, and e meet conditions as specified by formulae:
- 0.05≦a≦0.4;
- 0.10≦e≦0.85;
- 0≦b≦0.70;
- 0≦c≦0.2;
- 0.005≦d≦0.05;
- and
- a+b+c+d+e=1,
- wherein, when b is 0, the atomic ratios a and e meet a condition as specified by formula:
- a/e<1.0,
- wherein the atomic ratios a, b, c, d, e, and x meet a condition as specified by Formula (3) when R does not comprise Ce, and
- wherein the atomic ratios a, b, c, d, e, and x meet a condition as specified by Formula (4) when R comprises Ce, where Formulae (3) and (4) are expressed as follows:
- 0.8≦[x/(2a+1.5e+1.5b+2c+1.5d)]≦1.2 (3)
- 0.8≦[x/(2a+1.5e+1.5b+2c+2d)]≦1.2 (4).
Dependencies are inferred from the claim text.