What is the thermal conductivity of a refractory fire brick?

The thermal conductivity of a refractory fire brick can vary widely depending on its composition, temperature, and other factors. However, in general, the thermal conductivity of a typical refractory fire brick ranges from about 0.5-1.5 W/(m·K) at room temperature.

At higher temperatures, however, the thermal conductivity of the fire brick may increase significantly due to changes in its microstructure and chemical properties. For example, at temperatures above 1000°C, many fire bricks undergo structural changes that can reduce their mechanical strength and increase their thermal conductivity.

It's worth noting that the thermal conductivity of a fire brick is an important property that affects its overall performance in high-temperature applications. In general, materials with lower thermal conductivity are better suited for insulation purposes, while materials with higher thermal conductivity are better suited for applications where heat needs to be transferred efficiently.