Heat breaks down even the strongest metal. When space ships return from various exploration and research missions from space our atmosphere welcome them with heat, heat so high that can melt huge strong space ship. In industry high temperature is required for various purposes either it is manufacturing, synthesizing or molding.
Special material known as refractory material is used to protect and allow structures to support high temperatures, pressure and even a chemical attack. These materials are specially used inside furnaces where temperature plummets from 1000°C to 3000°C. This material is also used in nuclear bunkers to protect VIPs and even its alloys with other strong metals is used in space ships. Refractory material chemically should be very stable at high temperatures. As their usage varies from requirement to requirement so they are also resistant to thermal shock and chemically inert.
Mostly oxides of aluminum, silicon and magnesium are important components of refractory materials but oxides of calcium and fire clays are also used. Refractory material must be used according to the conditions they face. Zirconia is used where we deal with extremely high temperature. Silicon carbide and carbon i.e. graphite are also used in severe temperatures when there is no oxygen present because they oxidize and burn.
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