Process for producing fibres composed of or coated with carbides

Details Process for producing fibres composed of or coated with carbides Process for producing fibres composed of or coated with carbides

1989-07-25

1992-05-26

Beck, Shrive

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Rod, strand, filament or fiber

423291, 423346, 427215, 427249, 4272554, 428366, B05D 724

Patent

active

051166798

ABSTRACT:
A process for producing fibres composed of or coated with carbides or nitrides. The process involves forming a first reaction zone containing microfine particles of an oxide (or oxide precursor) of silicon or a suitable metal (e.g. boron) uniformly mixed with carbon (or a carbon precursor); forming a second reaction zone comprising a layer having a thickness of 1 cm or less of a porous mass having a density of 1 g/cc or less formed of short or continuous fibres made of or coated with carbon (or carbon precursor); heating the first reaction zone in a non-oxidizing atmosphere to generate a gaseous sub-oxide of the silicon or metal; simultaneously heating the second reaction zone so that the gaseous sub-oxide diffuses into it and reacts with the carbon to form carbide or nitride on the fibres; and separating the resulting fibres from any carbide or nitride whiskers that may have formed in the second rection zone. Short or continuous fibres (e.g. in the form of a fabric or paper-like sheets) consisting of or coated with carbides or nitrides can be formed in this way.

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patent: 4536379 (1985-08-01), Carlson et al.
patent: 4605688 (1986-08-01), Simpson et al.
patent: 4789536 (1988-12-01), Schramm et al.
patent: 4832929 (1989-05-01), Saiki et al.
patent: 4849196 (1989-07-01), Yamada et al.

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