What is Refractory?

Question

It has to do something with ceramics or clay...

Answer 1

"Refractory materials retain their strength at high temperatures. They are used to make crucibles and to make refractory linings, which line furnaces, kilns and incinerators. The oxides of magnesium (magnesite) and calcium (lime) are the most important refractory materials, though fireclay is widely used as well. Zirconia is used when the material must withstand extremely high temperatures. Silicon carbide is another refractory material. It is very strong at high temperatures, but will burn in the presence of oxygen, if the protective silica coating comes off. Refractories must be chosen according to the conditions they will face. For example, carbon cannot be used when it will be in contact with oxygen, as it will burn. Acidic refractories cannot be used in a basic environment and basic refractories cannot be used in acidic environment because they will be eroded. Zircon, fireclay and silica are acidic, dolomite and magnesite are basic and alumina, chromite, silicon carbide, carbon and mullite are neutral. Refractory materials must be strong at high temperatures, resistant to thermal shock, chemically inert, and have low thermal conductivities and coefficients of expansion."

Answer 2

Refractory is a type of material which is designed for use in high heat environments such as kilns and furnaces. These materials should be chemically and physically stable at higher temperature. They must be resistant to the thermal shock. They should be chemically inert and have specific values of thermal conductivity and coefficient of thermal expansion.

Answer 3

Refractory material is one that retains and maintains its strength at high temperatures without softening or deformation in shape. The most important chemical composition of refractory is the oxides of aluminum, silicon and magnesium. Another oxide usually used in refractory is the oxide of calcium. Fire clays are also widely used in the manufacture of refractory. Zirconia is used when the material must withstand extremely high temperatures. Silicon carbide and carbon are two other refractory materials used in some very severe temperature conditions, but they cannot be used in contact with oxygen, as they will oxidize and burn.

Answer 4

Refractories are high temperature resistant materials that constitute the linings for high-temperature industrial furnaces and reactors and other processing units. In addition to being resistant to thermal stress and other physical phenomena induced by heat, refractories must also withstand physical wear and corrosion by chemical agents. Refractories are more heat resistant than metals and are required for heating applications above1000F(538C).
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Answer 5

It is a material to preserve heat in a fired furnace.

Answer 6

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What is Refractory?
It has to do something with ceramics or clay...