Ceramic fiber modules are now widely used in various kilns and industrial furnaces. The thermal insulation of ceramic fiber modules is mainly determined by its heat transfer characteristics.
Then the non-gas with low thermal conductivity in nature (except hydrogen) is a substance with low thermal conductivity and low heat capacity in the static state. The thermal conductivity of ceramic fibers is basically close to that of gas, because ceramic fibers are interwoven by solid fibers, filled with gas, and the porosity reaches 90%.
What factors affect the heat transfer of materials such as ceramic fiber modules?
01 Effect of porosity
The thermal insulation material has a better porosity or bulk density at each use temperature, and the thermal insulation effect is the best within this range. Therefore, the ceramic fiber module is divided into several grades according to the use temperature, and the density is also adjusted accordingly in the range of 210-260 according to the use situation.
02 Environmental influence
The low thermal conductivity of ceramic fiber modules is based on the premise of most gases, but if there are high-heat gases such as hydrogen or helium in the use environment, ceramic fiber products are not suitable.
03 Influence of test weight
For ceramic fibers, to maintain low thermal conductivity, the preferred density of ceramic fiber products is below 250kg/m3, and the porosity is above 90%.
04 Directional influence
During the molding process of ceramic fiber blanket or ceramic fiber board, the length and width direction of the area is the main direction. And the thermal conductivity of the front of the fiber product is much smaller than that of the side, so the back of the fiber product is close to the furnace wall during the application process, and the front is the high-temperature contact surface, so the fiber product cannot be installed perpendicular to the furnace wall.
