Thermal conductivity is generally used in light-weight insulation bricks in China, and the thermal conductivity parameter is rarely seen in heavy products.
The thermal conductivity coefficient of high alumina brick refers to the coefficient of heat flow rate per unit area of the brick under the condition of unit temperature gradient. The larger the porosity coefficient, the smaller the thermal conductivity coefficient. Thermal conductivity represents the energy passed by a unit area in a unit time and a unit temperature gradient in the process of energy transfer.
The thermal conductivity of high aluminum bricks is closely related to its chemical composition, mineral (phase) composition, and density (porosity) microstructure. Clay refractory bricks with different chemical compositions have different thermal conductivity. The number, shape, size and distribution of pores in high alumina refractory bricks all affect its thermal conductivity. Within a certain temperature, the greater the porosity, the smaller the thermal conductivity.
In the production process, general thermal equipment needs to consider the amount of heat loss after passing through refractory bricks, and calculate the heat preservation effect of heat insulation refractory conversion. In some flame-retardant heating furnaces such as coke ovens, it is also necessary to have refractory brick partition walls. High thermal conductivity, so the thermal conductivity of refractory bricks is one of the most important indicators in thermal design.
The pores in the high alumina brick have a great influence on the thermal conductivity. Within a certain temperature limit, for a certain range of porosity coefficient, the smaller.
Generally speaking, when understanding the thermal conductivity, it refers to the thermal conductivity of thermal insulation refractory bricks. When purchasing thermal insulation refractory bricks, customers will require thermal conductivity. The smaller the thermal conductivity, the better the thermal insulation effect. For ordinary high-alumina bricks, there is no need to consider the thermal conductivity.
What is the thermal conductivity of high alumina bricks?
The bulk density is 0.6g/cm3, and the thermal conductivity is 0.25w/m•k.
The bulk density is 0.8g/cm3, and the thermal conductivity is 0.29w/m•k.
The bulk density is 1.0g/cm3, and the thermal conductivity is 0.35w/m•k.
The bulk density is 1.2g/cm3, and the thermal conductivity is 0.45w/m•k.
Heavy high-alumina bricks generally do not have the index of thermal conductivity.
