Process for producing silicon carbide and metal carbides

Details Process for producing silicon carbide and metal carbides Process for producing silicon carbide and metal carbides

1989-05-16

1990-08-14

Doll, John

Chemistry of inorganic compounds

Boron or compound thereof

Binary compound

423345, 423439, 423440, 501 87, 501 88, C01B 3136, C01B 3130, C01B 3134

Patent

active

049485733

ABSTRACT:
A process for forming carbides of silicon or metals in fine powder or whisker form. The process comprises forming a substantially uniform and non-agglomerated dispersion of a microfine powder of an oxide of silicon or a carbide-forming metal within a matrix of a polymer, carbonizing the oxide-containing polymer in an inert atmosphere and heating the carbonized product at high temperature to cause the oxide to react with carbon to form a carbide. The polymer must have a molecular weight of at least 10,000, a high carbon yield of at least 30% by weight, and a chemical structure which is infusible or capable of being rendered infusible. The preferred polymers are polyacrylonitrile, cellulose and polyvinyl alcohol, but other polymers with similar characteristics can be employed. The process is relatively inexpensive and gives an extremely finely divided product of high purity.

REFERENCES:
patent: 3403008 (1968-09-01), Hamling
patent: 3932594 (1976-01-01), Gortsema
patent: 3947550 (1976-03-01), Fitchmun
patent: 4126652 (1978-11-01), Oohara et al.
patent: 4190439 (1980-02-01), Gortsema
patent: 4284612 (1981-08-01), Horne et al.
patent: 4410502 (1983-10-01), Yamaguchi et al.
patent: 4444894 (1984-04-01), Shaver
patent: 4460697 (1984-07-01), Hara et al.
patent: 4515763 (1985-05-01), Boudart et al.
patent: 4529575 (1985-07-01), Enomoto et al.
U.S. Application Ser. No. 541,188, 12/7/84 (Chemical Abstracts 102:977336).
Oak Ridge National Laboratory-Carbothermal Synthesis of Silicon Carbide Janney, et al.-May 1985.
Synthesis of Sinterable SiC Powders by Carbothermic Reduction of Gel-Derived Precursors and Pyrolysis of Polycarbosilane-Wei, et al.-vol. 63, No. 8 (1984).
"ORLON" Acrylic Fiber: Chemistry and Properties-R. C. Houtz Textile Research Journal, Nov. 1950.

Affiliated with

Also associated with

Rating

Process for producing silicon carbide and metal carbides does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for producing silicon carbide and metal carbides, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for producing silicon carbide and metal carbides will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-461369