What is the thermal conductivity of alumina brick?

The thermal conductivity of alumina brick can vary depending on its composition, porosity, and temperature. Generally, the thermal conductivity of alumina brick is considered to be low to moderate, ranging from 1.5 W/mK to 3.5 W/mK at room temperature.

At elevated temperatures, the thermal conductivity of alumina brick decreases due to the increased scattering of phonons by lattice defects, such as vacancies and grain boundaries. The thermal conductivity of alumina brick also decreases with increasing porosity, which creates more voids that impede the flow of heat.

In applications where good thermal insulation is required, low thermal conductivity alumina bricks are preferred. In contrast, in applications where efficient heat transfer is desired, high thermal conductivity alumina bricks may be used.