Method of etching ceramic frictional or sealing elements
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United States of America Patent
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Jul 16, 1991
Issued Date -
N/A
app pub date -
Sep 7, 1988
filing date -
Feb 26, 1985
priority date (Note) -
Expired
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Abstract
Combinations of frictional and sealing elements made from hard substances, such as sintered aluminum oxide, are ground and lapped at their surfaces of engagement. At least one surface has at least some micro-blurred areas. The micro-blurring is produced by chemical etching. Phosphoric acid can be used as the chemical etching, and in thermal etching, the etching temperature is between 1400.degree. and 1560.degree. C.
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