refractory refers to the quality of a material to retain its
strength at high temperatures.
Any material can
be described as ‘refractory’, if it can with stand the action of
abrasive or corrosive solids, liquids or gases at high
requirements of a refractory material can be summed up as :
• Ability to withstand high temperatures.
• Ability to withstand sudden changes of temperatures.
• Ability to withstand action of molten metal slag, glass, hot
• Ability to withstand load at service conditions.
• Ability to withstand load and abrasive forces.
• Low coefficient of thermal expansion.
• Should be able to conserve heat.
• Should not contaminate the material with which it comes into
produced from a small range of high melting point materials,
notably magnesia, dolomite, bauxite, andalusite, fireclay and
silica, and smaller quantities of carbon, graphite, chromite,
zircon and zirconia are used to improve their properties.
produced in two basic forms, formed objects, and unformed
manufacturing involves four processes: raw material processing,
and final processing.
used mainly in the Iron and Steel industry and also used in
other refineries and smelting processes.
of high alumina refractories includes the hearth and shaft of
blast furnaces, ceramic kilns, cement kilns, glass tanks and
crucibles for melting a wide range of metals.
Firebrick is used
extensively in the iron and steel industry, nonferrous
metallurgy, glass industry, pottery kilns, cement industry, and
by many others.
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