Refractory Technology
Fireclay refractories have

Poor thermal spalling resistance
Tendency to expand unduly high during firing
Very high cost
Low co-efficient of thermal expansion

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Refractory Technology
What is Thoria?

All of these
Thoria Has high resistance to basic slags
Thoria Has high fusion temperature (> 3000°C) but poor resistance to thermal shock
Which is expensive & radioactive, is used in crucibles for melting high purity metals

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Refractory Technology
Thermal conductivity of refractory bricks

Increases with the amount of air entrapped in pores
Increases with decrease in porosity
Decreases with decreases in porosity
Is independent of its porosity and is maximum for insulating bricks

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