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Volume 6 Research & Reviews: Journal of Material Sciences
ISSN: 2321-6212 Ceramics 2018
May 14-15, 2018
May 14-15, 2018 | Rome, Italy
4th International Conference and Expo on
Ceramics and Composite Materials
Novel diesel particulate filters containing fine ceramic fibres
AJ Houston and TW Clyne
University of Cambridge, UK
Ongoing concerns about adverse health effects of carbon particulate in Diesel engine exhausts continue to drive the quest
for improvement performance from Diesel Particulate Filter (DPF) systems for their removal. Two of the main areas in
which improvements are being sought are enhanced removal of very fine particles (<~50nm), particularly during the period
immediately after regeneration (removal of accumulated particulate via combustion), and improved thermo-mechanical
stability - especially in terms of resistance to thermal shock (during regeneration). The latter is focused partly on raising the
fracture toughness of the materials concerned. One approach to achieving these aims is to create novel composite materials
via the introduction of (ceramic) fibres. This has the potential both to enhance the fracture toughness, mainly by promoting
fibre pull-out, and to improve the filtration efficiency by creating “hybrid” (multi-scale) structures, with some gas flowing
through very fine channels, while the presence of other (relatively coarse) pathways ensures that the overall permeability
remains acceptably high. For DPFs, the latter requirement corresponds to the specific permeability being no lower than about
~10-12 m2. This presentation covers the creation of novel DPF structures containing fine ceramic fibres and measurement of
their porosity, permeability and fracture toughness. Work is also presented on tomographic capture of DPF structures (using a
Simpleware package) and simulation of the flow through them of hot gas containing fine carbon particulate (using COMSOL
packages. It is concluded that there is scope for significant improvement in overall DPF performance via the incorporation of
fine fibres.
Res. Rev. J Mat. Sci. 2018, Volume 6
DOI: 10.4172/2321-6212-C1-015