Refractory Technology
Carbon refractories are exclusively used in the

Hearth of blast furnace
Walls of coke oven
Regenerators of coke oven
Side wall of soaking pits

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Refractory Technology
Thermal conductivity of refractory bricks

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

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Refractory Technology
Cermets are

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

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