Effect of preparation parameters on the properties of unidirectional SiC-fibre-reinforced MAS and BMAS glass-ceramics

被引:10
作者
Reich, C [1 ]
Bruckner, R [1 ]
机构
[1] TU BERLIN,INST NICHTMET WERKSTOFFE,D-10587 BERLIN,GERMANY
关键词
fibre-reinforced glass-ceramics; MAS; BMAS; mechanical properties;
D O I
10.1016/S0266-3538(96)00176-5
中图分类号
TB33 [复合材料];
学科分类号
摘要
The objective of this paper is to investigate the possibilities of fibre-reinforced glass-ceramics based on cordierite (MAS, magnesium alumino-silicate) and barium-osumilith (BMAS, barium magnesium alumino-silicate) and to find optimum preparation conditions with respect to mechanical properties, particularly high strength and toughness values. The prepregs were prepared by the sol-gel slurry method, the composites by application of the most effective densification conditions via the molten and high-viscosity state and by crystallisation under various temperature/pressure/time programmes. Best properties were obtained in the BMAS system with 14 wt% BaO at a relatively low SiC-fibre content of 20 to 30 vol% (strength: 534MPa, work of fracture: 16 kJ m(-2)). Higher values of strength were obtained with a predominant glass phase (up to 900 MPa) but these composites have only low application temperatures. Here, the optimum fibre concentration is much higher (about 50 vol%) than in the crystallised composites. The lower optimum fibre content of the predominantly crystallised composites is a consequence of a different phase composition and microstructure of the matrix compared with that without the presence of fibres under the same thermal and pressure conditions. (C) 1997 Elsevier Science Limited.
引用
收藏
页码:533 / 541
页数:9
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