High-temperature ultrasonic characterization of the mechanical and microstructural behavior of a fibrous composite with a magnesium lithium aluminum silicate glass-ceramic matrix
- Ecole Polytechnique Federale de Lausanne (Switzerland)
- Unite de Recherche Associee au CNRS No. 320, Limoges (France). Lab. Materiaux Ceramiques et Traitements de Surface
The mechanical behavior and the microstructural modifications of a SiC-fiber-reinforced magnesium lithium aluminum silicate glass-ceramic (SiC/MASL) have been characterized by ultrasonic measurement of uniaxial Young`s modulus at high temperature. Under vacuum, long isothermal agings in the 750--1,000 C temperature range have shown matrix modifications in terms of crystallization of residual glassy phases, and of phase transformations in the Li{sub 2}O-Al{sub 2}O{sub 3}-SiO{sub 2} system. In air, long isothermal agings performed under the same conditions have led to the same matrix transformations but in competition with oxidation mechanisms of the carbon fiber-matrix interphase. All of these matrix and/or interface transformations have been confirmed by X-ray diffraction analysis, scanning electron microscopy, scanning acoustic microscopy, and microindentation tests.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 247914
- Journal Information:
- Journal of the American Ceramic Society, Vol. 79, Issue 4; Other Information: PBD: Apr 1996
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COMPOSITE MATERIALS
MICROSTRUCTURE
YOUNG MODULUS
SILICON CARBIDES
MAGNESIUM SILICATES
LITHIUM SILICATES
ALUMINIUM SILICATES
ULTRASONIC WAVES
AGING
AIR
CRYSTALLIZATION
PHASE TRANSFORMATIONS
INTERFACES
OXIDATION
X-RAY DIFFRACTION
TRANSMISSION ELECTRON MICROSCOPY
SCANNING ELECTRON MICROSCOPY
ACOUSTIC MICROSCOPY