Thermal and mechanical properties of mullite-crystallized glass ceramics DPF with pulse-wave corrugated honeycomb structure

摘要

As one of the high temperature capability Diesel Particulate Filter (DPF), mullite fiber ceramics had developed. It had some merits as high filtration efficiency, low initial back pressure, light weight and so on, but it also had a fatal weak point as lower thermal shock resistance compared with cordielite ceramics. It's derived form its higher thermal expansion coefficient, lower mechanical strength and lower thermal conductivity. Sericite clay used as a ceramic binder mainly effects on the thermal properties, and the structure of DPF effects on the mechanical strength. New sericite clay, in which the potassium oxide content is refined, reduces the thermal expansion coefficient compared with the previous clay and the ratio of the sericite clay and ceramics fiber relates to the thermal conductivity of DPF. The structure of DPF is also examined to improve the mechanical strength. In this paper, we will report how these properties are improved, and describe the evaluation of the mullite-crystallized glass ceramics DPF.