Composite chromium plating film and sliding member covered there

Details Composite chromium plating film and sliding member covered there Composite chromium plating film and sliding member covered there

1997-11-10

2000-01-11

Thibodeau, Paul

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

428666, 277440, 277442, 277443, 277444, B32B 1504, B32B 1500

Patent

active

060133805

ABSTRACT:
A piston ring formed with a nitrided layer over all surfaces and formed with a composite chromium plating film over the nitrided layer in the outer circumferential surface. The composite chromium plating film has a network of cracks formed on the outer surface and interior. Si.sub.3 N.sub.4 particles are fixed in these cracks. The average size of the Si.sub.3 N.sub.4 particles is 0.8 to 3 .mu.m and the dispersion ratio of the Si.sub.3 N.sub.4 particles is 3 to 15 percent by volume.

REFERENCES:
patent: 4846940 (1989-07-01), Neuhauser et al.
patent: 5295696 (1994-03-01), Harayama et al.
patent: 5601293 (1997-02-01), Fukutome et al.
patent: 5648620 (1997-07-01), Stenzel et al.

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