The thermal conductivity of ceramic fiberboard comes from many aspects and can be summarized as follows
The thermal conductivity of ceramic fiberboard comes from many aspects and can be summarized as follows:
1, the use of atmosphere: usually fiber material is used in the atmosphere (oxidative atmosphere), the gas present in the pores is air, therefore, the role of the gas phase in the ceramic fiber is actually the thermal insulation of the fiber material The heat transfer of the reducing gas in the reducing gas (H 2 , CO, SO 2 , NO 2 , NO, NH 3 ammonia gas) will be higher than that of the oxidizing gas, and the heat insulating effect will also be affected.
2. Density: The density of ceramic fiber is closely related to its thermal conductivity and specific heat capacity and strength.
3, fiber humidity: affected by the production process, climate, construction and use conditions, ceramic fiber contains a certain amount of moisture, has an important impact on the thermal insulation properties of ceramic fibers.
4, slag ball: slag ball is a high-temperature melt in the fiberization process can not be fiberized, the content of spherical particles slag ball is too high will lead to increased heat transfer.
5. Fiber direction: The thermal conductivity of ceramic fiber is related to the fiber direction. When the material and bulk density are the same, the thermal conductivity of the heat flow direction perpendicular to the fiber is greater than the thermal conductivity when the heat flow direction is parallel to the fiber.
6, fiber diameter: When the fiber density is the same, the finer the fiber diameter, the smaller the pore size, the greater the damping effect on heat transfer.
7, temperature: the thermal conductivity of general fiber materials increases with increasing temperature.