Synthesis, characterization, and tensile strength of CVI SiC/BN/SiC composites

Conference · Tue Oct 01 00:00:00 EDT 1991 · Ceramic Engineering and Science Proceedings; (United States)

OSTI ID:6108204

Kmetz, M A; Laliberte, J M; Willis, W S; Suib, S L; Galasso, F S

Tows of Nicalon yarn were first precoated by CVD with amorphous BN, then infiltrated with SiC by CVD to form single strand composites. Two different methods for the preparation of BN were investigated. The first involved the formation of a BCl3-NH3 adduct; the second consisted of the direct reaction of the gases in hot zone. Tensile strength measurements made on the composites were about 277 MPa and displayed a considerable amount of fiber pull-out and crack bridging. In order to establish their thermal stability, the ends of the composites were cut, exposing the fiber and interface, and annealed in air to 1100 C for 70 h. This annealing process did not result in a decrease in tensile strength. The composites were characterized by AES, SEM, and X-ray diffraction analysis. 16 refs.

• OSTI ID: 6108204
• Report Number(s): CONF-910162-; CODEN: CESPD
• Journal Information: Ceramic Engineering and Science Proceedings; (United States), Vol. 12; Conference: 15. annual conference on composites and advanced ceramics, Cocoa Beach, FL (United States), 13-16 Jan 1991; ISSN 0196-6219
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BORON NITRIDES
SYNTHESIS
TENSILE PROPERTIES
SILICON CARBIDES
ANNEALING
CARBON
CERAMICS
CHEMICAL VAPOR DEPOSITION
COMPOSITE MATERIALS
CRACKS
ELECTRON MICROSCOPY
FIBERS
INTERFACES
REINFORCED MATERIALS
X-RAY DIFFRACTION
BORON COMPOUNDS
CARBIDES
CARBON COMPOUNDS
CHEMICAL COATING
COHERENT SCATTERING
DEPOSITION
DIFFRACTION
ELEMENTS
HEAT TREATMENTS
MATERIALS
MECHANICAL PROPERTIES
MICROSCOPY
NITRIDES
NITROGEN COMPOUNDS
NONMETALS
PNICTIDES
SCATTERING
SILICON COMPOUNDS
SURFACE COATING
360601* - Other Materials- Preparation & Manufacture
360603 - Materials- Properties