The refractory brick which has good thermal shock resistance at high temperature but cracks on cooling below 400°C is__________________?
Correct answer: C. Silica
- A. Magnesite
- B. Chrome
- C. Silica
- D. Fireclay
Explanation
Silica refractories resist thermal shock at high temperature but undergo a volume change during the quartz-to-cristobalite transformation on cooling, causing cracking below about 400°C.
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