Composite chromium plating film and sliding member covered thereof
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United States of America Patent
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-
Apr 25, 2000
Grant Date -
N/A
app pub date -
Nov 10, 1997
filing date -
Nov 11, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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