Chemical tempering in porcelains is done to interrupt crack propagation by______________?
Correct answer: D. Inducing residual compressive strength
- A. Transformation toughening
- B. Dispersion of crystalline phase
- C. All of the above
- D. Inducing residual compressive strength
Explanation
Chemical tempering strengthens porcelain by ion exchange at the surface, producing residual compressive stress that resists crack opening and propagation. Transformation toughening and dispersion strengthening are different ceramic-strengthening mechanisms.
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