Zirconia refractories are not used in_____________________?
Correct answer: C. Furnaces subjected to fluctuating temperature
- A. Making sheaths for thermocouple
- B. Lining high temperature ceramic kilns
- C. Furnaces subjected to fluctuating temperature
- D. High frequency induction furnaces in the form of inductors
Explanation
Zirconia withstands very high temperatures and is used for thermocouple sheaths and kiln linings, but its poor thermal-shock resistance makes it unsuitable for furnaces exposed to fluctuating temperatures. Such temperature cycling can cause cracking.
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