OXYGEN TRANSPORT CERAMIC MEMBRANES

This report covers the following tasks: Task 1-Design, fabricate and evaluate ceramic to metal seals based on graded ceramic powder/metal braze joints; Task 2-Evaluate the effect of defect configuration on ceramic membrane conductivity and long term chemical and structural stability; Task 3-Determine materials mechanical properties under conditions of high temperatures and reactive atmospheres; Task 4-Evaluate phase stability and thermal expansion of candidate perovskite membranes and develop techniques to support these materials on porous metal structures; Task 5-Assess the microstructure of membrane materials to evaluate the effects of vacancy-impurity association, defect clusters, and vacancy-dopant association on the membrane performance and stability; and Task 6-Measure kinetics of oxygen uptake and transport in ceramic membrane materials under commercially relevant conditions using isotope labeling techniques