Discussion
Zircon and zirconia refractories are valued for their low thermal expansion together with resistance to
Answer: B
Correct answer: attack by molten metals and glass
Zircon and zirconia resist wetting and chemical attack by molten glass and by many molten metals, and their low thermal expansion gives good resistance to spalling under thermal cycling. That combination is why they are used in glass tank blocks and in continuous casting nozzles despite their cost.
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