Failure characteristics of low dielectric constant ceramic composites reinforced with BN-coated fibers

Conference · Sun Oct 01 04:00:00 EDT 1989 · Ceramic Engineering and Science Proceedings; (USA)

OSTI ID:6926071

Lane, J E; Pebler, A R

Composites having low dielectric constant were prepared using a cordierite-based matrix reinforced with Al{sub 2}O{sub 3}, Si-N-C-O, or boron aluminosilicate fibers. Previous experience has shown that these fibers react with the oxide matrix during composite consolidation which leads to brittle composite failure. To prevent this fiber/matrix interaction and to promote nonbrittle behavior, a boron nitride coating was applied to the fibers to act as a barrier/debonding layer. The coating was applied via a low temperature borazine decomposition process. BN-coated Al{sub 2}O{sub 3} fiber-reinforced composites displayed nonbrittle behavior after four-point tests, whereas BN-coated Si-N-C-O and BN-coated boron aluminosilicate fiber-reinforced composites exhibited brittle behavior. 11 refs.

• OSTI ID: 6926071
• Report Number(s): CONF-890130--
• Conference Information: Journal Name: Ceramic Engineering and Science Proceedings; (USA) Journal Volume: 10
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BORON COMPOUNDS
BORON NITRIDES
CARBON COMPOUNDS
CARBON OXIDES
CERAMICS
CHALCOGENIDES
COATINGS
COMPOSITE MATERIALS
DIELECTRIC PROPERTIES
ELECTRICAL PROPERTIES
FAILURES
FIBERS
MATERIALS
MATRIX MATERIALS
NITRIDES
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
PROTECTIVE COATINGS
SILICON COMPOUNDS
SILICON OXIDES