Pyrometric cone equivalent (PCE) value (Segar cone) of 'superduty refractories' is more than 33 which corresponds to a temperature of __________ °C.
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Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of __________ °C.
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Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of __________ °C.
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PCE value (Segar cone) of superduty refractories is more than 33, which is equivalent to a temperature of __________ °C.
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Magnesite bricks have poor resistance to attack by __________ slag.
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__________ bricks should not be used in oxidising atmosphere.
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__________ bricks are used in the burning zone of a cement rotary kiln.
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High thermal conductivity of a refractory material is not important, when it is to be used in the
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Thermal diffusivity of a refractory brick is high, when its __________ is high.
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Upper portion of hot metal mixer are lined with mullite bricks, which helps in resisting the
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Most Cermets, which normally have high thermal conductivity and high thermal shock resistance, comprises of ceramic & metallic components of __________ percent respectively.
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Presence of MgO in alumino-silicate refractories __________ its refractoriness.
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Fusion point of a basic refractory material is
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Which is not a natural insulating material?
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Zirconia refractories are not used in
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Silica refractories are not used in
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High alumina refractories are used in the
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Test piece for determination of RUL of a refractory is heated in a/an
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Lower wall courses of soaking pits are made of __________ bricks to avoid the action of molten slag & scale.
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Spalling resistance of a refractory can not be increased by
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