Refractory Technology
Thermal conductivity of refractory bricks

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

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Refractory Technology
Cermets are

Having high strength & resistance to high temperature
All of these
Composite material containing both ceramic & metallic constituents
Used in space vehicles, missiles & nuclear energy plants

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