Cermets are combination of ceramic and metallic materials due to which they have high strength & resistance to high temperature. Cermets are used in the
Firing temperature of magnesite bricks is about __________ °C.
Maximum alumina content in high alumina refractory can be as high as __________ percent.
Magnesite refractories are used for the construction of those furnaces, which are
Which is not a basic refractory ?
Thoria
Hot metal runner in blast furnace are lined with __________ bricks.
Hollow refractory bricks are made by
Roof of a basic electric furnace is made of __________ bricks.
Which property of refractories is the most important for top section of the blast furnace?
Spray test determines the __________ of refractories.
Quartz is
An indication of degree of firing in silica brick is its
High density refractory bricks have lower
Cold crushing strength of refractories depends upon its
Periclase is
Maximum water percentage in refractory mix meant for hand moulding may be as high as __________ percent.
Si percentage in silica refractories used in the walls of coke oven is about
Bottom of basic open hearth furnace are constructed of
Silliminite (Al2O3.SiO2) refractory, which is a neutral refractory, is not used in
Tar bonded dolomite bricks
Which of the following is not a neutral refractory ?
Fireclay bricks are never used in the
Silica bricks are attacked by basic slags at high temperature. Which of the following is not used solely as a binding material?
Which form of silica has the highest specific gravity ?
Refractories used in/for __________ should have low thermal conductivity.
Most Cermets, which normally have high thermal conductivity and high thermal shock resistance, comprises of ceramic & metallic components of __________ percent respectively.
Which is not a high alumina refractory ?
Zircon refractories have
Cermets are
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