Failure mechanisms of 3-D woven SiC/SiC composites under tensile and flexural loading at room and elevated temperatures
Nicalon silicon carbide 3D yarn with silicon carbide matrix composites made through a chemical vapor infiltration (CVI) process were investigated under tensile and flexural loading at 23, 1200 and 1550 C in air. The effectiveness of a chemical vapor deposition (CVD) SiC surface coating was also evaluated in severe oxidizing environment. Acoustic emission sensors and in situ optical microscopy were used at room temperature to monitor the failure mechanisms. It is shown that the level of tensile stress at which nonlinear behavior begins is not drastically reduced at 1200 and 1550 C when composites were protected by a SiC surface coating. Extensive fiber pull-out was observed only in the 1550 C specimen. Similar behaviors were also found in flexural specimens. 14 refs.
- OSTI ID:
- 7292587
- Report Number(s):
- CONF-920144-; CODEN: CESPD
- Journal Information:
- Ceramic Engineering and Science Proceedings; (United States), Vol. 13:7-8; Conference: 16. annual conference on composites, materials, and structures, Cocoa Beach, FL (United States), 13-16 Jan 1992; ISSN 0196-6219
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COMPOSITE MATERIALS
FAILURE MODE ANALYSIS
TENSILE PROPERTIES
SILICON CARBIDES
ACOUSTIC EMISSION TESTING
CHEMICAL VAPOR DEPOSITION
COATINGS
CORROSION RESISTANCE
DEFORMATION
FIBERS
FLEXURAL STRENGTH
OPTICAL MICROSCOPY
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 1000-4000 K
ACOUSTIC TESTING
CARBIDES
CARBON COMPOUNDS
CHEMICAL COATING
DEPOSITION
MATERIALS
MATERIALS TESTING
MECHANICAL PROPERTIES
MICROSCOPY
NONDESTRUCTIVE TESTING
SILICON COMPOUNDS
SURFACE COATING
SYSTEM FAILURE ANALYSIS
SYSTEMS ANALYSIS
TEMPERATURE RANGE
TESTING
360603* - Materials- Properties