- Time:Aug 16, 2023
The refractoriness of a refractory material is an index to measure its ability to withstand high temperatures. The refractoriness is usually expressed by the temperature at which the refractory sample begins to soften or deform under standard conditions. Here are some common refractoriness classifications:
1. Ultra-high refractoriness (over 2000°C): including silicon carbide ceramics, silicon nitride ceramics, zirconia ceramics, etc. These materials have extremely high melting points and excellent high temperature stability, and can be used in extremely high temperature environments, such as high temperature furnaces and the electronics industry.
2. High refractoriness (1750-2000°C): including aluminate ceramics, alumina ceramics, magnesium aluminum spinel, etc. These materials remain stable at high temperatures and are widely used in metallurgy, glass and ceramic industries, among others.
3. Medium refractoriness (1350-1750°C): including silicate ceramics, silicon carbide ceramics, vermiculite ceramics, etc. These materials have good refractory properties at moderate temperatures and are widely used in equipment such as kilns, furnaces and chemical reactors.
4. Low refractoriness (1000-1350°C): including clay bricks, high alumina bricks, silica bricks, etc. These materials are suitable for low temperature environments found in general industrial locations such as boilers, pipes and chimneys.
It should be noted that the refractoriness is not only determined by the material itself, but also affected by factors such as external conditions, heating rate and atmosphere composition. Therefore, when evaluating the refractoriness of refractory materials, the actual service conditions and expected temperature range need to be considered.
