Pyrocarbon and process for depositing pyrocarbon coatings
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United States of America Patent
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Oct 14, 1997
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N/A
app pub date -
Jan 16, 1996
filing date -
Sep 8, 1994
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Abstract
Pure unalloyed pyrocarbons having wear resistance suitable for use in pyrocarbon-coated heart valve components and having mechanical properties, such as flexural strength and toughness, superior to commercial silicon-alloyed pyrocarbons are deposited in fluidized bed coaters. Coating conditions are carefully controlled so as to maintain a precise bed size within a defined coating enclosure which will assure a substantially constant surface deposition temperature that in turn assures deposition of homogenous unalloyed pyrocarbons having these improved mechanical properties.
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