Manufacture of improved pyrolytic carbon structures
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United States of America Patent
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Nov 16, 1993
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app pub date -
Aug 25, 1992
filing date -
Aug 25, 1992
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Abstract
Pyrolytic carbon products are manufactured so as to have improved structural properties. Pyrolytic carbon is deposited on a substrate in a fluidized bed of small particles at a temperature of about 1200.degree. to about 1400.degree. C., and after cooling to ambient temperature, the pyrolytic carbon is machined to desired physical dimensions for a heart valve component or the like. By heating such pyrolytic carbon structures in an inert gas atmosphere to a temperature in the range of about 1000.degree.-1500.degree. C. for at least about one hour following machining, it is found that stresses created in the pyrolytic carbon as a result of the machining are relieved without adverse effect to mechanical properties of the pyrocarbon, resulting in components having greater structural integrity.
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