Strength and thermal shock resistance of fiber-bonded Si-Al-C-O and Si-Ti-C-O ceramics |
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Authors: | Maria Carmen Vera Julian Martínez-Fernández Mrityunjay Singh Joaquin Ramirez-Rico |
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Affiliation: | 1. Dpto. Fisica de la Materia Condensada and Instituto de Ciencia de Materiales de Sevilla, Universidad de Sevilla – CSIC, Sevilla, Spain;2. Ohio Aerospace Institute, Cleveland, Ohio, USA |
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Abstract: | Silicon carbide-based fiber-bonded ceramics, obtained from hot pressing of woven silicon carbide fibers, are a cost-effective alternative to ceramic-matrix composites due to their ease of fabrication, involving few processing steps, and competitive thermomechanical properties. In this work, we studied the high-temperature strength and thermal shock resistance of Si-Al-C-O and Si-Ti-C-O fiber-bonded SiC ceramics obtained from hot pressing of two types of ceramic fibers, by mechanical testing in four-point bending. The bending strength of Si-Al-C-O-based fiber-bonded ceramics at room temperature is ∼250–260 MPa and remains constant with temperature, while the bending strength of Si-Ti-C-O increases slightly from the initial 220 to ∼250 MPa for the highest temperature. Both materials retain up to 90% of their room temperature strength after thermal shocks of 1400°C and show no reduction in elastic moduli. After thermal shock, failure mode is the same as in the case of as-received materials. |
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Keywords: | fibers silicon carbide strength thermal shock/thermal shock resistance |
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