Scientific Program

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Invited Lecture

Orientation of pore space in diesel particulate filter materials

Thursday (08.10.2020)
10:20 - 10:50
Part of:


Porous ceramic diesel particulate filters (DPFs) are extruded products that possess macroscopic anisotropic mechanical and thermal properties. This anisotropy is caused by both morphologic features (mostly the orientation of porosity) and crystallographic texture. We systematically studied those two aspects in a cordierite and two aluminum titanate (AT) ceramic materials of different porosity using mercury porosimetry, gas adsorption, electron microscopy, X-ray diffraction, and X-ray refraction radiography. We found that a lower porosity in AT content implies a larger isotropy of both the crystal texture and the porous space orientation. We also found that, analogous to cordierite, AT crystallites do align with their axis of negative thermal expansion along the extrusion direction. However, unlike what found for cordierite, the aluminium titanate crystallite form is such that a more pronounced (0 0 2) texture along the extrusion direction implies porosity aligned perpendicular to it.

Speaker:
Prof. Dr. Giovanni Bruno
Bundesanstalt für Materialforschung und -prüfung (BAM)
Additional Authors:
  • Cong Chen
    Bundesanstalt für Materialforschung und -prüfung (BAM)
  • Dr. Bernd R. Müller
    Bundesanstalt für Materialforschung und -prüfung (BAM)
  • Carsten Prinz
    Bundesanstalt für Materialforschung und -prüfung (BAM)
  • Julia Stroh
    Bundesanstalt für Materialforschung und -prüfung (BAM)
  • Ines Feldmann
    Bundesanstalt für Materialforschung und -prüfung (BAM)
  • Dr. Andreas Kupsch
    Bundesanstalt für Materialforschung und -prüfung (BAM)