The ratio of the weight to volume of the ceramic fiber modules is the bulk density of the ceramic fiber module, and the bulk density is an index that determines whether the selection of the furnace lining is reasonable, and is an important factor affecting the thermal conductivity. So how to choose the density of the ceramic fiber module? SUNTHERM is here to tell everyone today!
1. Density and thermal conductivity
The good thermal insulation performance of ceramic fiber comes from its low thermal conductivity. The thermal conductivity of the ceramic fiber module decreases with the increase of bulk density, but the degree of decrease gradually decreases. When the density exceeds 300kg/m3, the thermal conductivity is no longer Decrease, and there is a tendency to increase.
2. Ultimate density
The density limit of the ceramic fiber module is 260kg/m3. This is because the ceramic fiber blanket is made of fiber cotton with a double-roll spinning process. The length of the fiber cotton is between 80-130mm. Once the limit density of 260kg/m3 is exceeded, the fiber will be broken in a large amount, and the breakage rate is as high as 48%. Thereby affecting product performance.
To sum up, in practical applications, the density of ceramic fiber modules should be considered comprehensively according to the furnace type, temperature, combustion medium, and temperature rise requirements of the heat treatment furnace, but the reasonable density should be between 200-260kg/m3. 220kg/m3 is the best.
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