Hard coating material, sliding member covered with hard coating

Details Hard coating material, sliding member covered with hard coating Hard coating material, sliding member covered with hard coating

1998-06-05

2000-05-09

Speer, Timothy M.

Stock material or miscellaneous articles

Composite

Of inorganic material

428217, 501132, 277443, 277444, 508108, 427530, B32B 1900, F16J 926, C23C 1406

Patent

active

060601825

ABSTRACT:
A hard film is covered on the outer circumferential surface of a piston ring by means of an arc ion plating. The hard film has a mixture of crystal structure of CrN and crystal structure of Mo.sub.2 N containing oxygen in a solid solution state, and comprises chromium at 40 to 78 percent by weight, molybdenum at 3 to 35 percent by weight, oxygen at 3 to 20 percent by weight and the remainder of nitrogen. The crystal particle size is less than 1 .mu.m. The Vickers hardness is within a range from 1600 to 2500. The film thickness is preferably 1 to 60 .mu.m. Carbon in a solid solution state at 0.5 to 8 percent by weight may be substituted for the oxygen. Alternatively, both oxygen and carbon may be contained in a solid solution state with oxygen at 3 to 20 percent by weight, carbon at 0.5 to 8 percent by weight with the total content of carbon and oxygen within 25 percent by weight.

REFERENCES:
patent: 5449547 (1995-09-01), Miyazaki et al.
patent: 5582414 (1996-12-01), Miyazaki et al.
patent: 5601293 (1997-02-01), Fukutome et al.
patent: 5743536 (1998-04-01), Komuro et al.
patent: 5851659 (1998-12-01), Komuro et al.

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