In Mar. 245 pieces ceramic fiber bulk are packed for delivering to customer in Israel. High quality and nice price thermal insulation materials in Topower Refractory.
Ceramic fiber bulk, as a refractory material, has a certain thermal insulation effect, and the thermal insulation effect is affected by thermal conductivity, so what are the factors that affect its thermal conductivity? Here's what to know:
1. Material
The chemical middle layer, structure and aggregation state of aluminum silicate fiber. When the density of each kind of material is interphase, the conductivity coefficient of the material with high thermal conductivity is also high density: The thermal conductivity generally decreases with the decrease of the material's performance density, but when reduced to a certain extent, it increases rapidly with the decrease of performance density. Therefore, the thermal physical properties of lightweight thermal insulation material ceramic fiber board are characterized by small thermal conductivity and large thermal conductivity.
Humidity: The conductance coefficient of ceramic fiber bulk will decrease after moisture absorption, and the experiment shows that the decrease or increase of moisture content, the conductance coefficient may increase or decrease. This is because the thermal conductivity depends on the ratio of the thermal conductivity to the volume heat capacity, and both the thermal conductivity and heat capacity increase as the water content of the material increases. But the rate of increase is not the same, which determines the law of variation of the conductivity coefficient.
2. Temperature
The thermal conductivity of aluminum silicate ceramic fiber bulk
generally increases with the increase of temperature, but the increase is small, but the influence is not large, generally not considered.
3. Heat flow line heat flow
Simple parallel or perpendicular to the fiber extension direction, high thermal conductivity. Ceramic fiber bulk is made of fiber by vacuum forming staggered, heat flow will not extend along the fiber loss, so the thermal conductivity is small, good thermal insulation performance.
The most important indexes of ceramic fiber cotton are fiber diameter and thermal stability. Ceramic fibers have a uniform diameter of 24 microns. Fine fiber, small density, low thermal conductivity of the use of high temperature. If the fiber is thick and dense, the application effect is not ideal. The thermal stability of fiber is more important. The amount of shrinkage also directly affects the thermal stability.
