TY  - JOUR
AU  - Zhang, Jizu
AU  - Malzbender, Jürgen
TI  - Mechanical Characterization of Micro- and Nano-Porous Alumina
JO  - Ceramics international
VL  - 41
IS  - 9
SN  - 0272-8842
CY  - Amsterdam [u.a.]
PB  - Elsevier Science
M1  - FZJ-2015-05795
SP  - 10725-10729
PY  - 2015
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000359165500049
DO  - DOI:10.1016/j.ceramint.2015.05.007
UR  - https://juser.fz-juelich.de/record/255662
ER  -