Boron/nitrogen preceramic polymers and boron nitride ceramic mat

Details Boron/nitrogen preceramic polymers and boron nitride ceramic mat Boron/nitrogen preceramic polymers and boron nitride ceramic mat

1989-10-06

1992-11-10

Shaver, Paul F.

Organic compounds -- part of the class 532-570 series

Organic compounds

Silicon containing

528 33, 528 38, C07F 708, C07F 502

Patent

active

051625580

ABSTRACT:
Organometallic boron
itrogen polymers, precursors of boron nitride, are prepared by reacting at least one trihalogenoborane with at least one silazane compound containing at least one .tbd.Si--NH--Si.tbd. group, by gradually introducing the silazane compound into the trihalogenoborane, while maintaining the reaction medium at a temperature ranging from -100.degree. to 0.degree. C. and wherein the ratio of the gram equivalents of the .tbd.Si--NH--Si.tbd. groups of the silazane to the number of moles of trihalogenoborane is greater than 1; the resulting organometallic polymers are facilely pyrolyzed into boron nitride ceramic materials.

REFERENCES:
patent: 4581468 (1986-04-01), Paciorek et al.
patent: 4767728 (1988-08-01), Riccitiello et al.
patent: 4851491 (1989-07-01), Riccietello et al.

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