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The PRIMARY drawback of Ceramic Matrix Composites (CMCs) compared to Metal Matrix Composites (MMCs) is:
A{'text': 'BRITTLE failure mode — ceramic matrix cracks catastrophically, even with fiber reinforcement', 'label': 'B'}
B{'text': 'Higher cost only', 'label': 'D'}
C{'text': 'Lower max operating temperature', 'label': 'A'}
D{'text': 'Lower stiffness', 'label': 'C'}
Answer & Solution
Correct answer: A. {'text': 'BRITTLE failure mode — ceramic matrix cracks catastrophically, even with fiber reinforcement', 'label': 'B'}
CMCs aim to mitigate ceramic brittleness via fiber bridging across cracks, but the matrix is still inherently brittle. Compared to MMCs (which have a ductile metal matrix), CMCs are less tolerant of damage but operate at higher temperatures.
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