The correlation between porosity characteristics and the crystallographic texture in extruded stabilized aluminium titanate for diesel particulate filter applications. Issue 4 (April 2020)

• Record Type: Journal Article
• Authors: Chen, Cong; Müller, Bernd R.; Prinz, Carsten; Stroh, Julia; Feldmann, Ines; Bruno, Giovanni
• Is Part Of: Journal of the European Ceramic Society. Volume 40:Issue 4(2020)
• Page Start: 1592
• Page End: 1601
• Publication Date: 2020-04
• Subjects: Preferred orientation -- X-ray refraction -- Pore orientation -- Crystal structure -- Extrusion -- Microstructure-property relations; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2019.11.076
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Porous ceramic diesel particulate filters (DPFs) are extruded products that possess macroscopic anisotropic mechanical and thermal properties. This anisotropy is caused by both morphological features (mostly the orientation of porosity) and crystallographic texture. We systematically studied those two aspects in two aluminum titanate 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 content implies a larger isotropy of both the crystal texture and the porosity orientation. We also found that, analogous to cordierite, 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.