A ceramic-ceramic composite with low dielectric constant and nonbrittle failure

Journal Article · Tue Nov 01 04:00:00 EST 1988 · Advanced Ceramic Materials; (USA)

DOI:https://doi.org/10.1111/j.1551-2916.1988.tb00277.x· OSTI ID:5942797

Partlow, D P ^[1]

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1. Westinghouse R and D Center, Pittsburgh, PA (USA)

A composite having low dielectric constant and displaying nonbrittle failure was prepared using a cordierite-based matrix reinforced with boron aluminosilicate fibers. Since these fibers are normally chemically attacked by an oxide matrix during composite consolidation at high temperatures, good composite behavior required the application of a barrier/debonding coating on the fibers prior to composite fabrication. A boron nitride coating was applied using a known process, in which B{sub 2}O{sub 3} within the fiber diffuses to the surface and is nitrided. Fiber tensile testing showed that the coating process did not significantly lower the fiber strength, and the composite prepared with fibers coated by this process showed better mechanical properties than composites in which the barrier coating was either BN or carbon applied by chemical vapor deposition.

• OSTI ID: 5942797
• Journal Information: Advanced Ceramic Materials; (USA), Journal Name: Advanced Ceramic Materials; (USA) Vol. 3:6; ISSN 0883-5551; ISSN ACEME
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
BORON COMPOUNDS
BORON NITRIDES
BRITTLENESS
CARBIDES
CARBON COMPOUNDS
CHALCOGENIDES
COATINGS
DATA
DIELECTRIC PROPERTIES
ELASTICITY
ELECTRICAL PROPERTIES
EXPANSION
EXPERIMENTAL DATA
FABRICATION
INFORMATION
MEASURING INSTRUMENTS
MEASURING METHODS
MECHANICAL PROPERTIES
NITRIDES
NITROGEN COMPOUNDS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
SILICON CARBIDES
SILICON COMPOUNDS
SILICON OXIDES
TENSILE PROPERTIES
THERMAL EXPANSION