Refractory Technology
What is Thoria?

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

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Refractory Technology
Thermal conductivity of refractory bricks

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

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