Factors affecting the thermal conductivity (thermal conductivity) of refractory bricks

The thermal conductivity of refractory bricks is not only affected by temperature, but also closely related to its chemical mineral composition and organizational structure. When refractory bricks are composed of crystals, the properties of the crystals have a significant effect on the thermal conductivity. As we all know, the thermal conductivity of inorganic non-metallic materials is generally much lower than that of metals. This is because inorganic non-metallic materials, unlike metals with metallic bonds, have very few free electrons. In this material, the heat conduction caused by free electrons is extremely limited, and is mainly determined by the degree of deviation of the lattice vibration from resonance. The greater the deviation from resonance, the smaller the thermal conductivity. The degree of lattice vibration deviation increases with the increase of the difference in the molar mass of the constituent substances, so the thermal conductivity of the elemental substance is the largest (the thermal conductivity of graphite is larger).