Plastic and nonmetallic article shaping or treating: processes – Gas or vapor deposition of article forming material onto...
Patent
1992-08-25
1993-11-16
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Gas or vapor deposition of article forming material onto...
264 85, 264162, 264235, 264317, 264346, 264DIG51, 422139, 427213, 427249, F27B 914, C04B 4185
Patent
active
052621049
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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patent: 4546012 (1985-10-01), Brooks
Carbon Implants Inc.
Thurlow Jeffery
Vargot Mathieu
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