Chemical method of strengthening porcelain involves_________________?
Correct answer: C. Exchange of sodium and potassium ions
- A. Exchange of aluminium and sodium ions
- B. Exchange of aluminium and potassium ions
- C. Exchange of sodium and potassium ions
- D. None of the above
Explanation
Chemical strengthening uses ion exchange, replacing smaller sodium ions at the porcelain surface with larger potassium ions. The larger ions create compressive surface stress that resists crack propagation.
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