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← ScienceWhich mechanism causes brittleness when ceramic sintering exceeds optimal temperature?
A)Grain boundary phase ionic segregation✓
B)Increased dislocation density inhibits slip
C)Rapid thermal expansion microfracturing
D)Residual stress prevents crack propagation
💡 Explanation
Ionic segregation concentrates impurities at the grain boundaries, disrupting lattice continuity and weakening the material; because of this weakening mechanism, the ceramic becomes brittle rather than pliable, therefore it fractures more easily during use.
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