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Refractory Technology

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

Thoria
Zirconia
Alumina
Magnesia

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Refractory Technology
Thoria is an expensive refractory material and is radioactive in nature. Thorium oxide is used in the manufacture of

Segar cones
Crucibles used for melting of high purity metals
Muffles for muffle furnaces
Insulating bricks

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Refractory Technology
Refractoriness of a typical silica brick corresponds to Segar cone number, '32', which is equivalent to a temperature of __________ °C.

1380
1915
1710
1520

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Refractory Technology
Spalling tendency of refractories is reduced by increasing its

Strength
Thermal conductivity
Specific gravity
Porosity

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Refractory Technology
Refractory materials are never used in the construction of

Pressure vessels
Orton cones
Segar cones
Ovens & retorts

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Refractory Technology
Grog

Iscrushed firebrick
All of these
Contains both alumina and silica
Is a non-plastic material

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