Spalling resistance of a refractory cannot be increased by ____________________?
Correct answer: C. Making it denser
- A. Increasing its porosity
- B. Using a coarser grog during its manufacture
- C. Making it denser
- D. Decreasing its thermal co-efficient of expansion
Explanation
Spalling resistance improves with some porosity, coarser grog, and a lower thermal expansion coefficient because these reduce thermal stresses. Making the refractory denser generally reduces its ability to accommodate thermal shock.
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