Titania-alumina-yttria piston ring facing
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United States of America Patent
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Feb 3, 1981
Grant Date -
N/A
app pub date -
Sep 12, 1979
filing date -
Sep 12, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Disclosed is a coating for bearing faces of piston rings and a powder composition for plasma spray application of such coating. The plasma spray powder comprises 94%-98% by weight of aluminum oxide and titanium oxide and 2%-6% by weight of yttrium oxide. The inclusion of yttrium oxide in the aluminum oxide-titanium oxide coating composition reduces the tendency of the coating to blistering and spalling which resulting in coating loss during use of the ring. Intra-coating delamination is substantially reduced or eliminated.
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