Process for preparing oxynitride ceramic fibers

Details Process for preparing oxynitride ceramic fibers Process for preparing oxynitride ceramic fibers

1991-04-19

1992-05-19

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

501 97, 501 98, 264DIG19, 423325, 423344, C04B 3558

Patent

active

051148870

ABSTRACT:
The process of this invention for preparing oxynitride ceramic fibers comprises spinning a viscous sol obtained by the hydrolysis of a feed mainly consisting of metal alkoxides, steam-treating the gel fibers, and firing the steam-treated gel fibers in a stream of ammonia and is commercially useful for the production of oxynitride fibers with excellent hardness, strength, modulus of elasticity, heat resistance, and corrosion resistance.

REFERENCES:
patent: 476138 (1988-08-01), Oguri et al.
patent: 4650773 (1987-03-01), Okamura et al.
patent: 4869858 (1989-09-01), Funayama et al.
patent: 4916093 (1990-04-01), Okamura et al.
patent: 5021370 (1991-06-01), Ishikawa et al.
Chemistry Letters, pp. 2059-2060, 1984, "The Synthesis of Silicon Oxynitride Fibers by Nitridation of Polycarbosilane".
Journal of Materials Science 22 (1987) pp. 937-941, "Nitridation of TiO.sub.2 Fibres Prepared by the Sol-Gel Method".
Journal of Non-Crystalline Solids 83 (1986) pp. 208-222, "Nitrogen-Containing SiO.sub.2 Glass Fibers Prepared by Ammonolysis of Gels Made From Silicon Alkoxides".

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