Microstructural and strength stability of CVD SiC fibers in argon environments

Conference · Tue Oct 01 04:00:00 EDT 1991 · Ceramic Engineering and Science Proceedings; (United States)

OSTI ID:6116357

Bhatt, R T; Hull, D R

The room temperature tensile strength and microstructure of three types of commercially available chemically vapor deposited silicon carbide fibers were measured after 1, 10, and 100 hour heat treatments under argon pressures of 0.1 to 310 MPa at temperatures to 2100 C. Two types of fiber had carbon-rich surface coatings and the other contained no coating. All three fiber types showed strength degradation beyond 1400 C. Time and temperature of exposure had greater influence on strength degradation than argon pressure. Recrystallization and growth of near stoichiometric SiC grains appears to be the dominant mechanism for the strength degradation. 8 refs.

• OSTI ID: 6116357
• Report Number(s): CONF-910162--
• Conference Information: Journal Name: Ceramic Engineering and Science Proceedings; (United States) Journal Volume: 12
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
AMBIENT TEMPERATURE
ARGON
CARBIDES
CARBON
CARBON COMPOUNDS
CHEMICAL COATING
CHEMICAL VAPOR DEPOSITION
COATINGS
CRYSTAL STRUCTURE
DEPOSITION
ELEMENTS
FIBERS
FLUIDS
GASES
HEAT TREATMENTS
MECHANICAL PROPERTIES
MICROSTRUCTURE
NONMETALS
RARE GASES
RECRYSTALLIZATION
SILICON CARBIDES
SILICON COMPOUNDS
STOICHIOMETRY
SURFACE COATING
TENSILE PROPERTIES