Continuous silicon carbide whisker production

Details Continuous silicon carbide whisker production Continuous silicon carbide whisker production

C - Chemistry, Metallurgy

01

B

23/389, 23/54

C01B 31/36 (2006.01) C30B 25/00 (2006.01)

Patent

CA 1202168

ABSTRACT OF THE DISCLOSURE The invention features methods and apparatus for obtaining silicon carbide whiskers on a continuous basis. Coked 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.

417834

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