Refractory Technology
Fireclay refractories

Shrink during firing
All of these
Combine with salts (e.g. chlorides sulphates etc.) & bases (e.g. lime, magnesia etc.) forming fusible aluminates silicates etc
Are not resistant to the action of basic slags

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Refractory Technology
Magnesite chrome refractories

Are not at all resistant to the corrosive action of iron oxide
Have better spalling resistance than chrome magnesite refractories
Have very low (50 kg/cm² ) cold crushing strength (C.C.S.), and can not be used in metalcase form
Have very low thermal co-efficient of expansion

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Refractory Technology
Cermets are

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

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