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REFRACTORY TECHNOLOGY

Refractory Technology
Carborundum used for making crucibles for melting non-ferrous metals is chemically

Silicon nitride
Crystalline magnesia
Zirconium sulphate
Silicon carbide

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Refractory Technology
Which one contains minimum percentage of SiO₂?

Firebrick
Sillimanite
Semi-silica
Aluminous firebrick

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Refractory Technology
Dilatometer is used for the determination of __________ of refractories.

Resistance to CO attack
RUL
Permanent linear change
Modulus of rupture

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Refractory Technology
Segar cones are used for the determination of __________ of refractories.

Resistance to slag attack
Electrical conductivity
Spalling resistance
Softening temperature

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Refractory Technology
RUL of refractories depends on the

Chemical composition
All of these
Presence of impurities like iron & alkali
Physical structure

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