Silicon Carbide (SiC)
The second most popular filter material is silicon carbide is a ceramic compound of silicon and carbon , or SiC. It has a higher melting point (4500 °F / 2500 °C) than cordierite, however it is not as stable thermally, making packaging an issue, again the canning process and filter substrate matting material are essential DET has this covered, by not only using the highest and best materials on the market but also by using our Patented Canning Process.
The substrate is made up of small SiC cores which are of single pieces, while larger cores are made in segments, these are separated by a special cement so that heat expansion of the core will be taken up in part by the cement, and not all by the matting. SiC cores are usually more expensive than cordierite cores, however they are manufactured in similar sizes, and one can often be used to replace the other.
Some of our SiC filters have different cell porosity and cell density thus they have the ability to withstand greater soot loading. As technology is moving on the two materials are becoming more alike, but with regards to SiC consideration has to also be given to its greater weight then Cordierite, thus making application engineering a little more difficult.
Silicon carbide filter cores also look like catalytic converter cores that have had alternate channels plugged - again the plugs force the exhaust gas flow through the wall and the particulate collects on the inlet face.