High-temperature ultrasonic characterization of the mechanical and microstructural behavior of a fibrous composite with a magnesium lithium aluminum silicate glass-ceramic matrix

Journal Article · Mon Apr 01 00:00:00 EST 1996 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1996.tb08531.x· OSTI ID:247914

Cutard, T ^[1]; Huger, M; Fargeot, D; Gault, C ^[2]

---

1. Ecole Polytechnique Federale de Lausanne (Switzerland)
2. 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

Related Subjects

36 MATERIALS SCIENCE
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