Synthesis of boron nitride ceramics from poly(borazinylamine) precursors
Several simple monomeric boron and nitrogen reagents have been utilized as starting materials in high-temperature pyrolyses or chemical vapor deposition schemes to prepare hexagonal boron nitride. However, extensive applications and demands for new forms (films, gels, foams, fibers) have recently led to searches for improved syntheses and processing techniques for BN. The authors preliminary studies indicate that an oligomeric borazinylamine gel can be prepared in high yield, and this gel provides a useful precursor for the formation of hexagonal boron nitride. It is also very important to note that this chemistry provides a system which is adaptable to sol-gel processing. Although several features require additional study, it is apparent that the amine cross-linking of borazene fragments offers a beneficial and important advance in the use of borazenes as sources for BN. It is interesting to note that some investigators have suggested that the presence of silica in boron nitride improves its processing characteristics as well as prevents hydrolysis of boron nitride. Therefore, the presence of organosilicon in their synthesis may prove beneficial. Additional studies of chemicall modified borazenes and other cross-linking reagents are in progress.
- Research Organization:
- Univ. of New Mexico, Albuquerque
- OSTI ID:
- 5919008
- Journal Information:
- J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 109:18; ISSN JACSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
AMINES
BORON COMPOUNDS
BORON NITRIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COLLOIDS
DATA
DISPERSIONS
ELECTRON MICROSCOPY
EMISSION SPECTROSCOPY
EXPERIMENTAL DATA
GELS
INFORMATION
INFRARED SPECTRA
MICROSCOPY
NITRIDES
NITROGEN COMPOUNDS
NUMERICAL DATA
ORGANIC COMPOUNDS
PNICTIDES
SPECTRA
SPECTROSCOPY
SYNTHESIS
TRANSMISSION ELECTRON MICROSCOPY