The thermal conductivity of lightweight refractory castables is affected by many factors, including the composition, structure, density and working temperature of the material, so it is difficult to generalize which material has the lowest thermal conductivity. However, some specific lightweight refractory castables do have lower thermal conductivity. The following are some lightweight refractory castables with relatively low thermal conductivity:
Alumina ceramics: can withstand high temperatures, and have good thermal insulation and corrosion resistance. They are often used for thermal insulation in high temperature environments.
Ceramic fiber: can also withstand high temperatures and has good thermal insulation. It is the preferred material for high temperature thermal insulation.
Silicate fiber: It is an inorganic non-metallic material with low thermal conductivity and good insulation performance. It is often used to improve the thermal insulation performance of equipment. Mullite lightweight castable: It is composed of high-strength refractory aggregate, ultrafine powder and composite additives. It has the characteristics of high refractoriness, high strength and low thermal conductivity. It is suitable for industrial kilns that need to reduce heat energy consumption. In addition, lightweight thermal insulation castables made of lightweight materials such as perlite, vermiculite and refractory fibers also have the characteristics of low strength and low thermal conductivity. Please note that the selection of these materials should be determined according to the specific use environment and needs. At the same time, the thermal conductivity is also affected by factors such as material preparation process and microstructure. Therefore, in practical applications, it may be necessary to conduct experiments to determine the most suitable lightweight refractory castable for a specific application environment.
HOME