%0 Journal Article
%A Zhang, Jizu
%A Malzbender, Jürgen
%T Mechanical Characterization of Micro- and Nano-Porous Alumina
%J Ceramics international
%V 41
%N 9
%@ 0272-8842
%C Amsterdam [u.a.]
%I Elsevier Science
%M FZJ-2015-05795
%P 10725-10729
%D 2015
%X Advanced membrane concepts are based on thin layers that require a mechanically robust porous substrate material. Aiming at the use in pre-combustion systems, alumina substrate with different pore sizes were characterized with respect to their mechanical properties. Elastic moduli and fracture stresses were assessed using ring-on-ring bending tests. Furthermore, elastic moduli were compared to data obtained from indentation tests. Although porosity of the micro- and nano-porous materials were equal, elastic moduli and fracture stress values revealed significant differences, indicating that based on mechanical considerations the nano-porous material is far superior, although initial permeation test indicate difficulties in using it as porous substrate. Elastic moduli showed good agreement with a model based on the load-bearing contact area. Microstructural investigations supported that the higher strength of the nano-porous material is a result of a larger contact area between grains.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000359165500049
%R 10.1016/j.ceramint.2015.05.007
%U https://juser.fz-juelich.de/record/255662