Method for the preparation of silicon carbide whiskers

Details Method for the preparation of silicon carbide whiskers Method for the preparation of silicon carbide whiskers

1988-12-15

1989-10-10

Pal, Asok

Chemistry of inorganic compounds

Silicon or compound thereof

Binary compound

156603, 156DIG64, 156DIG112, C01B 336

Patent

active

048730696

ABSTRACT:
A method for achieving a high yield of beta silicon carbide whiskers. According to this method, very small (e.g., 0.002 microns) fluffy silicon dioxide particles having a very large surface area (e.g., 200 m.sup.2 /g) are mixed with a fluffy carbonized material. These materials have a void volume of about 40 percent or greater. The silicon dioixde is present in an amount by weight approximately twice that of the carbon constituent. This mixture is heated, preferably in the presence of a catalyst (e.g., anhydrous boric oxide and powdered aluminum metal) at a temperature of about 1650.degree..+-.300.degree. C. for a time of one-half to four hours. During this heating the gaseous reaction products are maintained at a steady state as with a low flow of argon gas through the furnace. The resultant SiC whiskers have a diameter in the range of about 0.5 to 10 micrometers, and a length of about 10 to about 1000 micrometers. These SiC whiskers are principally beta phase silicon carbide and the whiskers have a smooth surface morphology. The effects of the variables are described.

REFERENCES:
patent: 3692478 (1972-09-01), Knippenberg et al.
patent: 3754076 (1973-08-01), Kutler
patent: 3933984 (1976-01-01), Kimura et al.
patent: 4248844 (1981-02-01), Ramsay et al.
patent: 4249700 (1981-02-01), Pareuh et al.
patent: 4283375 (1981-08-01), Horne et al.
patent: 4284612 (1981-08-01), Horne, Jr. et al.
patent: 4500504 (1985-02-01), Yamamoto
patent: 4504453 (1985-03-01), Tanaka et al.
patent: 4591492 (1986-05-01), Tanaka et al.
patent: 4605542 (1986-08-01), Harada

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