Preparation and use of a boron nitride precursor as binder for the densification of boron nitride

Journal Article · Wed Jan 31 23:00:00 EST 1990 · Journal of the American Ceramic Society; (USA)

DOI:https://doi.org/10.1111/j.1151-2916.1990.tb06509.x· OSTI ID:6820001

Maya, L; Angelini, P ^[1]

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1. Oak Ridge National Lab., TN (USA)

A precursor of boron nitride was prepared through the partial condensation of 2,4,6-trichloroborazine and bis-(trimethylsilyl)acetylene. This reaction was conducted at 100{degrees}C and is catalyzed by AlCl{sub 3}. The condensation product pyrolyzed at 800{degrees}C, producing trimethylsilyl chloride as a volatile product and a boron nitride rich residue containing 54 wt% of the initial weight. Mixtures of the precursor and commercial boron nitride were made and hot-pressed at 800{degrees}C and 27.6 MPa. A maximum density of 1.84 g/cm{sup 3} is reached at a loading corresponding to the deposition of 13 wt% residue derived from the precursor. Examination by analytical electron microscopy, including x-ray energy dispersive spectroscopy and electron energy loss spectroscopy analyses, revealed the location of material derived from the precursor in BN-binder composites through the presence of residual aluminum, silicon, and carbon. Crystallization of boron nitride from the precursor appears to have taken place, as deduced from the morphology of the phases observed and association with residual elements present in the binder.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6820001
• Journal Information: Journal of the American Ceramic Society; (USA), Journal Name: Journal of the American Ceramic Society; (USA) Vol. 73:2; ISSN 0002-7820; ISSN JACTA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400101 -- Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures
ALUMINIUM CHLORIDES
ALUMINIUM COMPOUNDS
BINDERS
BORON COMPOUNDS
BORON NITRIDES
CATALYTIC EFFECTS
CHEMICAL PREPARATION
CHEMICAL REACTION KINETICS
CHLORIDES
CHLORINE COMPOUNDS
ELECTRON MICROSCOPY
FABRICATION
HALIDES
HALOGEN COMPOUNDS
HOT PRESSING
KINETICS
MATERIALS WORKING
MICROSCOPY
NITRIDES
NITROGEN COMPOUNDS
PHASE STUDIES
PNICTIDES
PRECURSOR
PRESSING
REACTION KINETICS
SPECTRA
SYNTHESIS
X-RAY SPECTRA