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Refractory Technology

Refractory Technology
Which of the following is not a neutral refractory?

Chromite
Graphite
Silicon carbide
Magnesite

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Refractory Technology
Beryllia (which is used in making crucibles for melting uranium & thorium) is superior to alumina in all respects for high temperature (> 1900°C ) use, except

Cost
Thermal conductivity
Electrical conductivity
Fusion point

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Refractory Technology
Maximum apparent porosity of magnesite bricks is about __________ percent.

44
24
58
8

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Refractory Technology
__________ bricks should not be used in oxidising atmosphere.

Silica
Carbon
Fireclay
Tar dolomite

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Refractory Technology
Refractory bricks having lower porosity have

Low thermal conductivity
Low heat capacity
High insulating properties
Greater strength

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Refractory Technology
Firing of refractory brick is done to

Develop stable mineral forms in them
Dehydrate the dried refractory
Form ceramic bonds necessary for development of high crushing strength in the finished product
All of these

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