- Time:Aug 26, 2023
The thermal conductivity of refractory materials refers to the ability of materials to conduct heat, which means the amount of heat conduction per unit area per unit time. It measures the thermal conductivity of refractory materials, that is, the rate of heat transfer under a temperature gradient.
The thermal conductivity of refractories is usually expressed in terms of heat flux (W/m K) or thermal conductivity (W/(m K)). A lower thermal conductivity means that the material has better thermal insulation properties, which can reduce heat conduction and energy loss.
Different types of refractories have different thermal conductivity. Generally speaking, high-temperature ceramic materials such as alumina ceramics have low thermal conductivity, generally between 1-3 W/(m·K). Refractory materials such as silicon carbide, silicon nitride, and boron nitride have higher thermal conductivity, usually in the range of 100-200 W/(m·K).
Thermal conductivity is affected by several factors, including the material's crystal structure, composition, density, porosity, and temperature. In general, the order of the crystal structure, the compactness of the material, and the continuity of the heat conduction path affect the thermal conductivity. In addition, the temperature also has a certain influence on the thermal conductivity, usually, as the temperature increases, the thermal conductivity of the refractory material will increase slightly.
Understanding and controlling the thermal conductivity of refractories is important for designing and optimizing thermal equipment, protecting structures, and improving energy efficiency. According to specific application requirements, suitable refractory materials can be selected to meet the requirements of thermal conductivity.
