Mechanical behaviour and environmental stability of continuous fibre-reinforced glass-ceramic matrix composites
UNSPECIFIED. (1996) Mechanical behaviour and environmental stability of continuous fibre-reinforced glass-ceramic matrix composites. GLASTECHNISCHE BERICHTE-GLASS SCIENCE AND TECHNOLOGY, 69 (2). pp. 34-43. ISSN 0946-7475Full text not available from this repository.
The mechanical behaviour of three continuous silicon carbide fibre-reinforced glass-ceramic matrix composites has been investigated at room and high temperatures. Commercially available composites with magnesium aluminosilicate, calcium aluminosilicate and barium magnesium aluminosilicate glass-ceramic matrices were considered. The materials were tested in the as-received and aged (heat-treated in an oxidizing environment) condition. Four-point bend static tests and flexural creep, fatigue and creep-fatigue tests were carried out as well as a small quantity of tensile tests of aged composites. The experimental results have highlighted the importance of the carbon-rich layer at the fibre/matrix interface for obtaining ''graceful'' failures. At temperatures of 700 to 800 degrees C oxidative degradation of the interface results in significant strength reduction and a transition to brittle fracture mode. By rapid heat treatment of the materials at 1100 degrees C for 1 h it is possible to seal the fibre ends by forming a silica ''plug'' which prevents oxygen ingress, retaining the carbon-rich interphase and composite behaviour. The results of the creep and creep-fatigue tests indicate low-cycle loading has a strong influence on the life of components at high temperatures.
|Item Type:||Journal Article|
|Subjects:||T Technology > TP Chemical technology|
|Journal or Publication Title:||GLASTECHNISCHE BERICHTE-GLASS SCIENCE AND TECHNOLOGY|
|Publisher:||DEUTSCHEN GLASTECHNISCHEN GES|
|Number of Pages:||10|
|Page Range:||pp. 34-43|
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