Discussion
Silica brick must not be used below about 600 degrees in a cycling furnace because of the
Answer: D
Correct answer: volume change accompanying its crystalline inversions
Silica undergoes crystalline inversions below about 600 °C, and the accompanying volume changes are large and abrupt enough to crack the brick if it is cycled through them. Above that temperature the material is stable and performs excellently, which is why silica linings in coke ovens and glass tanks are held hot and cooled only slowly at shutdown.
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