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Refractory Technology

Refractory Technology
Chemically, mullite refractories is

3Al2O₃.2SiO₂
ThO₂
Al2O₃
ZrSO₄

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Refractory Technology
Mullite is chemically represented by

Al2O₃ . 2SiO₂
3Al2O₃ . 2SiO₂
Al2O₃ . SiO₂
2Al2O₃ . 3SiO₂

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Refractory Technology
Rate of slag attack on refractories increases with rise in temperature due to the

Decreased viscosity of slag
Increased thermal conductivity of brick
Oxidising condition in the furnace
None of these

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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

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

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Refractory Technology
Which is not a basic refractory?

Silicon carbide
Dolomite
Magnesite
Chrome magnesite

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Refractory Technology
Which is required in an insulating refractory?

Low porosity
Both A & B
Neither A nor B
High thermal conductivity

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