Stock material or miscellaneous articles – Composite – Of inorganic material
Patent
1989-10-12
1992-02-25
Lesmes, George F.
Stock material or miscellaneous articles
Composite
Of inorganic material
428902, 428367, 501 35, 501 88, 501 95, C04C 3556
Patent
active
050912712
ABSTRACT:
A shaped silicon carbide-based ceramic article having an improved mechanical strength is produced at a high efficiency by a process comprising the step of: forming an organic silicone polymer, for example, polycarbosilastyrene copolymer, into a predetermined shape, for example, a filament or film; doping the shaped polymer with a doping material consisting of at least one type of halogen, for example, bromine or iodine, in an amount of 0.01% to 150% based on the weight of the shaped polymer, to render the shaped polymer infusible; and pyrolyzing the infusible shaped polymer into a shaped SiC-based ceramic article at a temperature of 800.degree. C. to 1400.degree. C. in an inert gas atmosphere, optionally the halogen-doped shaped polymer being treated with a basic material, for example, ammonia, before the pyrolyzing step, to make the filament uniformly infusible.
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Nakaishi Akio
Sawaki Toru
Shimada Keizo
Watanabe Takashi
Lesmes George F.
Pawlikowski Beverly A.
Teijin Limited
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