Oxygen Transport Ceramic Membranes

Bandopadhyay, S. ; Nagabhushana, N. ; Zhou, X.-D ; Yelon, W.B. ; Anderson, H.U. ; Jacobson, Alan ; Mims, C.A.

University of Alaska

关键词: Titanium;    Crack Propagation;    Membranes;    Oxygen;    Strontium Oxides;   

DOI  :  10.2172/883054
RP-ID  :  none
RP-ID  :  FC26-99FT40054
RP-ID  :  883054

美国|英语

来源: UNT Digital Library

【 摘 要 】

The present quarterly report describes some of the investigations on the structural properties of dense OTM bars provided by Praxair and initial studies on newer composition of Ti doped LSF. Dense OTM bars provided by Praxair were loaded to fracture at varying stress rates. Studies were done at room temperature in air and at 1000 C in a specified environment to evaluate slow crack growth behavior. In addition, studies were also begun to obtain reliable estimates of fracture toughness and stable crack growth in specific environments. Newer composition of Ti doped LSF membranes were characterized by neutron diffraction analysis. Quench studies indicated an apparent correlation between the unit cell volume and oxygen occupancy. The studies however, indicated an anomaly of increasing Fe/Ti ratio with change in heat treatment. Ti doped LSF was also characterized for stoichiometry as a function of temp and pO{sub 2}. The non stoichiometry parameter {delta} was observed to increase almost linearly on lowering pO{sub 2} until a ideal stoichiometric composition of {delta} = 0.175 was approached.