Process for producing silicon carbide fibers

Details Process for producing silicon carbide fibers Process for producing silicon carbide fibers

1996-05-21

1998-10-20

Lewis, Michael L.

Chemistry of inorganic compounds

Silicon or compound thereof

Binary compound

20415745, C01B 3136

Patent

active

058242813

ABSTRACT:
The present invention provides a process for producing silicon carbide fibers having a C/Si molar ratio of from 0.85 to 1.39 and excellent in heat resistance and strength at high temperatures, while conventional processes have not been able to produce the fibers having the ratio of less than 1.56.
The process of the present invention comprises the steps of rendering infusible precursory fibers made from an organosilicon polymer compound to obtain infusible fibers, then primarily baking the infusible fibers in a hydrogen gas-containing atmosphere while raising the temperature thereof to obtain primarily baked fibers, and further secondarily baking the primarily baked fibers to obtain final fibers. The secondary baking is performed in the atmosphere of a mixed gas of an inert gas with hydrogen chloride gas at 1,500.degree. to 2,200.degree. C.

REFERENCES:
patent: 3758672 (1973-09-01), Lewis
patent: 4134759 (1979-01-01), Yajima et al.
patent: 4604367 (1986-08-01), Takamizawa et al.
patent: 4753763 (1988-06-01), Tanaka et al.
patent: 4923716 (1990-05-01), Brown et al.
patent: 4948762 (1990-08-01), Krumbe et al.
patent: 5021370 (1991-06-01), Ishikawa et al.

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