Process for producing a shaped silicon carbide-based ceramic art

Details Process for producing a shaped silicon carbide-based ceramic art Process for producing a shaped silicon carbide-based ceramic art

1988-10-05

1990-01-30

Lorin, Hubert C.

Plastic and nonmetallic article shaping or treating: processes

With step of cooling to a temperature of zero degrees c. or...

264 291, 264 292, 264 297, 264 56, 264 65, 264 66, 264 83, C04B 3332, C04B 3552

Patent

active

048972290

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 silicon 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.

REFERENCES:
patent: 3555138 (1971-01-01), Bryan, Jr.
patent: 4052430 (1977-10-01), Yajima et al.
patent: 4100233 (1978-07-01), Yajima et al.
patent: 4324901 (1982-04-01), West et al.
patent: 4743411 (1988-05-01), Shimada et al.
patent: 4767831 (1988-08-01), Baitos et al.

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