Refractory bricks are a kind of material that can be used for a long time in a high temperature environment without losing physical and chemical properties. They are widely used in the lining of high-temperature equipment in metallurgy, building materials, electricity, chemical industry and other industries, such as blast furnaces, kilns, etc.

What is the temperature limit of refractory bricks?
Different types of refractory bricks have different temperature limits, which mainly depends on their material composition:

Clay refractory bricks: common and low-priced, the main components are silicon dioxide (SiO₂) and aluminum oxide (Al₂O₃), and the temperature limit is 1580℃～1750℃.

High alumina bricks: contain high alumina (>48%), good thermal shock resistance and strength, and can withstand temperatures of 1770℃～1790℃.

Silica bricks: The main component is SiO₂, suitable for high-temperature structural environments, such as coke ovens and hot blast furnaces, with a temperature resistance of up to 1700℃ or more.

Magnesia brick (magnesia refractory brick): mainly composed of magnesium oxide, strong alkali resistance, suitable for cement kilns, etc., with a temperature resistance limit of up to 2000℃.

Zirconia corundum bricks, silicon carbide bricks and other special bricks: used in special high-temperature working conditions, some of which can withstand temperatures exceeding 2000℃.

Understand the refractory properties of refractory bricks in one article
"Refractory performance" not only refers to the temperature resistance, but also includes thermal shock stability, slag resistance, load softening temperature, thermal conductivity, volume stability and other indicators. High-quality refractory bricks can maintain structural stability at high temperatures, without softening, deformation, or melting, and can also resist chemical erosion (such as acid and alkali slag, furnace gas, etc.).

The evaluation of refractory performance usually includes:

Refractoriness: The highest temperature that the brick body can withstand without softening or melting.

Load softening temperature: The temperature at which the material undergoes significant deformation under pressure is a key indicator to measure its load-bearing capacity in actual working conditions.

Thermal shock stability: The ability of refractory bricks to not crack or peel off when they undergo rapid cycles from high temperature to room temperature.

Chemical corrosion resistance: The ability to resist corrosion from chemical components such as slag, alkali, and acid.

In summary, when selecting refractory bricks, their refractory properties should be comprehensively considered based on the actual use environment (temperature, furnace gas composition, physical load, etc.) to ensure the long-term safe operation of the equipment.