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

2000-04-25

Zimmerman, John J.

Stock material or miscellaneous articles

All metal or with adjacent metals

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

428687, 205113, 205197, 205109, 205110, 277443, 277444, B32B 1500, B23P 1500, C25D 1500, C23C 2800

Patent

active

06054225&

ABSTRACT:
A piston ring is 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. Spherical alumina particles are fixed in these cracks. The average size of the spherical alumina particles is 0.7 to 10 .mu.m and the dispersion ratio of the spherical alumina particles is 3 to 15 percent by volume.

REFERENCES:
patent: 3770286 (1973-11-01), Angilella et al.
patent: 3886637 (1975-06-01), Ellis et al.
patent: 4704336 (1987-11-01), Spriggs
patent: 4846940 (1989-07-01), Neuhauser et al.
patent: 4873150 (1989-10-01), Doi et al.

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