The ceramic fiber blanket has a thermal conductivity close to the air. The ceramic fiber blanket is composed of solid fiber and air. The porosity is as high as 90%. Many low thermal conductivity air is filled in the pores and destroys the solid molecules. Continuous network planning, and then get excellent thermal insulation.
And the smaller the pore diameter, the more the number of pores which are sealed by the solid fiber in the direction of heat flow, the better the adiabatic function of the ceramic fiber blanket.
The main factors affecting the thermal conductivity of ceramic fiber blankets include the following aspects: temperature, density, slag ball, fiber diameter, fiber moisture, operating atmosphere, fiber direction.
Since the ceramic fiber blanket has a different plan from the traditional refractory bricks and heat-insulating bricks, then the heat transfer process is also different.
The heat transfer in the ceramic fiber blanket is not simply the heat conduction of the solid fiber, but also the heat conduction of the air, the convective heat transfer of the gas in the open space and the radiation heat transfer between the walls of the hole.