发明名称 Structure for the filtration of a gas based on silicium carbide with a controlled wall surface porosity
摘要 Honeycomb structure for filtration of particle-loaded gas, has silicon carbide channel walls with an open porosity of 30-53 (preferably 43-49) % and a median pore diameter of 9-20 (preferably 12-18) microns, while the average number of pores with an opening area (OSA) of 20-310 microns 2> is more than 300 (preferably more than 350)/mm 2> of wall and the ratio between the total OSA of these open pores and the wall surface is 0.15-3.0, preferably 0.20-0.27. A honeycomb structure for the filtration of gas loaded with particles, comprising a body of adjacent ducts or channels with parallel axes separated by porous walls and closed by plugs at one end or the other to define inlet chambers opening on a gas admission side and outlet chambers opening on a gas evacuation side so that the gas passes through the porous walls. This structure has channel walls based on silicon carbide with an open porosity of 30-53 (preferably 43-49) % and a median pore diameter of 9-20 (preferably 12-18) microns; the average number of pores open at the wall surface and having an opening surface area (OSA) of 20-310 microns 2> is more than 300 (preferably more than 350)/mm 2> of wall and the ratio between the total OSA of these open pores and the surface of the walls is 0.15-0.30, preferably 0.20-0.27. An independent claim is included for a method for the production of this SiC-based filter structure by (a) mixing the initial mixture with a pore former (preferably polyethylene, polystyrene, starch, or graphite) to give a homogeneous bound paste, (b) extruding this product through a suitable die to form monolithic honeycomb structures, (c) drying the monoliths, possibly (d) assembling and (e) firing the monoliths, the required structure being obtained by controlling at least one of the following parameters: particle size distribution of the initial mixture, nature and amount of pore former(s) and/or firing temperature.
申请公布号 ZA200804582(B) 申请公布日期 2009.04.29
申请号 ZA20080004582 申请日期 2008.05.27
申请人 SAINT-GOBAIN CENTRE DE RECHERCHES ET D'ETUDES EUROPEEN SAS. 发明人 BARDON, SEBASTIEN;GLEIZE, VINCENT MARC;GIROT, PATRICK JACQUES DOMINIQUE
分类号 B01D 主分类号 B01D
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