R-SiC FOR NOVEL GEL-CAST CROSS FLOW FILTER

摘要

Currently most of the ceramic Diesel Participate Filters (DPFs) are produced in a honeycomb shape by extrusion. Alternate plugging of the channels on the front and back side forces the gas (o flow through the walls and inorganic ashes are accumulated in the filter. Cross flow filters can avoid this accumulation by introducing a removable ash-chamber. This paper describes the production process of cross flow DPFs made of recrystallized silicon carbide (RSiC) by gelcasling in combination with different wax mold fabrication techniques. Since a low viscosity slurry is crucial for a complete filling of the mold, the effects of different SiC powders on the slurry rheology have been examined. The sinter mechanism of RSiC is briefly described and the influence of different parameters is explained. The material was as well examined with respect to its mechanical and thermal properties. It is shown that both the flexural strength and the thermal conductivity are strongly dependent on the average pore diameter.