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Refractory Technology

Refractory Technology
Vacuum steel degassing units are lined with

High alumina bricks
Low duty firebricks
Graphite blocks
Silica bricks

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Refractory Technology
SiO₂ percentage in firebrick is about

35-40
80-85
55-60
>94

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Refractory Technology
Addition of zircon to silica refractory brick improves its

Neither A nor B
Neither A nor B
Resistance to slag attack
Crushing strength

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Refractory Technology
Highest melting (m.p = 3070°C) oxide refractory is

Thoria
Magnesia
Zirconia
Alumina

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Refractory Technology
Fireclay refractories have

Very high cost
Tendency to expand unduly high during firing
Poor thermal spalling resistance
Low co-efficient of thermal expansion

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Refractory Technology
Test piece for determination of RUL of a refractory is heated in a/an

Neutral atmosphere
Reducing atmosphere
Oxidising atmosphere
Electric furnace

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