Permeability of bricks is a measure of the
Basic bricks are not made of
Lower wall courses of soaking pits are made of __________ bricks to avoid the action of molten slag & scale.
Hot blast main (carrying air at 1000°C) in blast furnace are lined with __________ bricks.
Which of the following does not occur during firing/burning of refractories ?
Spalling resistance of a refractory can not be increased by
'Super refractories' are made from pure
Insulating refractories should have
Thermal conductivity of refractory bricks
Thermal spalling mainly occurs during __________ of furnaces.
With increase in the density of silica refractories, its
With increase in the alumina content in firebricks, its fusion point (refractoriness)
Addition of grog in fireclay brick during its manufacture is advantageous, because it results in
High alumina refractory compared to fireclay bricks have
Silicon carbide refractories are used in the
Fireclay refractories have
Chromite refractories are
Dolomite bricks have good resistance to attack by
Magnesite chrome refractories
Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with __________ bricks.
Fireclay refractories
Refractory bricks with lower permeability is produced by using
Refractory bricks having lower porosity have
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