When porcelain is basked against metal, it should possess a________________?
Correct answer: C. linear coefficient of thermal expansion less than but close to that of metal
- A. high fusion expansion
- B. high fusion temperature
- C. linear coefficient of thermal expansion less than but close to that of metal
- D. Linear coefficient of thermal expansion greater than, but close to that of the metal
Explanation
The porcelain should have a slightly lower, but closely matching, coefficient of thermal expansion than the metal. On cooling, this leaves the porcelain in beneficial compression and reduces cracking or debonding.
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