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SILICON CARBIDE (SiC) fibers are particularly useful in METAL MATRIX COMPOSITES (MMCs) because:
A{'text': 'They retain strength and stiffness at HIGH TEMPERATURES where polymer matrices would melt — used in jet-engine composites', 'label': 'B'}
B{'text': 'They are electrically conductive', 'label': 'D'}
C{'text': 'They are flexible', 'label': 'C'}
D{'text': 'They are cheap', 'label': 'A'}
Answer & Solution
Correct answer: A. {'text': 'They retain strength and stiffness at HIGH TEMPERATURES where polymer matrices would melt — used in jet-engine composites', 'label': 'B'}
SiC fibers (Nicalon, Tyranno) retain ~80% strength up to ~1200°C. Used as reinforcement in MMCs (Al-SiC, Ti-SiC) and CMCs (SiC-SiC) for high-temperature applications — turbine blades, exhaust components.
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