Boron-containing preceramic blend and fiber formed therefrom

Details Boron-containing preceramic blend and fiber formed therefrom Boron-containing preceramic blend and fiber formed therefrom

1989-01-05

1990-06-05

Dixon, Jr., William R.

Compositions: coating or plastic

Coating or plastic compositions

Carbohydrate or derivative containing

106209, 106214, 524 35, 524 45, 524 54, 524 55, 525 57, 525185, 525389, C08L 3312

Patent

active

049311000

ABSTRACT:
A process for producing boron-containing ceramics such as boron carbide and boron nitride comprises pyrolyzing a blend of a precarbonaceous polymer such as polyacrylonitrile and a boron-containing polymer such as that formed by the reaction of a borane with a Lewis base. Pyrolyzation in an inert atmosphere yields boron carbide while pyrolyzation in a reactive gas burns away the precarbonaceous polymer and yields a ceramic comprising the reaction product of boron and the pyrolyzation gas. Boron nitride ceramics are formed by pyrolyzing the preceramic blend in ammonia.

REFERENCES:
patent: 4810436 (1989-03-01), Johnson
patent: 4832895 (1989-05-01), Johnson

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