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A New Approach to Design High Porosity Silicon Carbide Substrates
Technical Paper
2010-01-0539
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Diesel particulate filters (DPF) are now a mandatory part in
diesel exhaust aftertreatment systems in order to achieve
compliance with current emission legislations. However future
demands for further NOx and CO₂ reductions combined with a maximum
amount of allowed particle numbers per ccm lead to special
requirements for the DPF substrate material. On the one hand high
filtration efficiency of soot particles in the nanometer scale has
to be reached and on the other hand high porosities and large pore
sizes have to be realized to support catalytic coating. In order to
have a base material composition which can easily be modified to
meet current and future demands a new SiC substrate, called XP-SiC,
was developed. The technology of the XP-SiC is based on a reaction
forming process of coextruded silicon and carbon particles to SiC.
This new manufacturing process leads to a unique microstructure
with a sponge-like appearance and a high porosity in the range of
50% - 70%. Key properties are its high filtration efficiency and
low bulk weight at low back pressure and high soot mass limit.
The aim of this paper is to give an introduction to this new
material. As examples we will show, that, depending on heat
treatment it is possible to create membrane-like structures to
achieve high filtration efficiency in both new and fully
regenerated state, as well as open surface structures for
applications with focus on low back pressure and high wash coat
loadings.
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Wolff, T., Friedrich, H., Johannesen, L., and Hajireza, S., "A New Approach to Design High Porosity Silicon Carbide Substrates," SAE Technical Paper 2010-01-0539, 2010, https://doi.org/10.4271/2010-01-0539.Also In
References
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