Discussion
Mullite is important as a refractory constituent because it
Answer: C
Correct answer: retains strength to high temperature and resists shock
Mullite melts above 1800 degrees, keeps its strength almost to that point, has a low thermal expansion and so tolerates thermal shock, and resists slag attack well. That combination is why it is the desirable phase in an aluminosilicate refractory and why kyanite is added to generate more of it - the plasticity and low melting options describe clay and glass, which are what mullite is wanted instead of.
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