Although ceramic filters can be used in high-temperature areas that other porous bodies cannot reach, it is best to use them in high-temperature areas below 1000 ° C when filtering combustion exhaust gas, molten metal, and nozzles where gas is blown into a high-temperature furnace. In order to adapt to the higher temperature region, it is considered to use a filter with very little binder, and the aggregates are self-combined with each other.
In the high temperature range of 700 ~ 1000 ℃, the silicon carbide ceramic filter with excellent thermal shock resistance shows good results. The second is the alumina ceramic filter. The figure below shows the change in high-temperature strength of a filter using silicon carbide as a bone (aggregate) and a specially formulated ceramic binder. As can be seen from the figure, below the temperature at which the binder begins to soften, the high-temperature strength tends to be higher than the normal-temperature strength.
Now the silicon carbide ceramic filter is used to discuss the thermal shock resistance of the ceramic filter. When the fluid is gas, from the shape of the product, it can withstand the rapid cooling and heating of the temperature difference of 400 ~ 700 ℃. Alumina ceramic filter can withstand the rapid cooling and heating of temperature difference of 300 ~ 400 ℃. This filter has such a high thermal shock resistance, because the ceramic is porous and can absorb thermal deformation.
