Continuous silicon carbide whisker production

Details Continuous silicon carbide whisker production Continuous silicon carbide whisker production

1984-12-27

1987-01-20

Dixon, Jr., William R.

Chemistry of inorganic compounds

Silicon or compound thereof

Binary compound

422232, C01B 3136

Patent

active

046379240

ABSTRACT:
The invention features methods and apparatus for obtaining silicon carbide whiskers on a continuous basis. Rice hulls or other carbon and silicon containing feed materials are continuously fed to a conversion zone in an unagitated state in order to promote whisker growth. The conversion zone is continuously purged, preferably with an inert gas such as nitrogen. The purging gas is vented directly out of the conversion zone and carries away gaseous reaction products and impurities, prevents oxidation of the whiskers and keeps glasses from condensing and depositing on the furnace surfaces. The feed materials are fed in a dry state to the conversion zone in order to prevent erosion of the furnace walls. After conversion and cooling the whiskers are separated from the mass of particulate silicon carbide. The whiskers find use as reinforcements.

REFERENCES:
patent: 3271109 (1966-09-01), Mezey et al.
patent: 4284612 (1981-08-01), Horne et al.
patent: 4504453 (1985-03-01), Tanaka et al.

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