Refractory Technology
Cermets are combination of ceramic and metallic materials due to which they have high strength & resistance to high temperature. Cermets are used in the

Roof of electric furnaces
Insulation of high temperature furnaces
Nuclear reactors, missiles & space crafts
Hearth of the blast furnace

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Refractory Technology
Silica refractories

Crack when subjected to sudden change of temperature
All of these
Can not be used in the dome of hot blast stoves
Have lower thermal conductivity than fireclay bricks

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