Abstract
The influence of sintering temperature, sintering time and heating rate on the shrinkage rate, sintered density and porosity of La0.6Sr0.4Co0.2Fe0.8O3-o (LSCF6428) perovskite-structured ceramics has been analyzed and the optimum sintering parameters have been determined by using Taguchi experimental design method. The analysis of variance (ANOVA) shows that the most significant parameter is sintering temperature, while the sintering time and heating rate are the least significant parameters. The optimum sintering parameter combination within the experimental ranges was found to be 1400°C, 20 h and 10°C/min. The shrinkage rate of 15.97%, the sintered density of 6.06 g/cm³ and the porosity of 0.15% were obtained using these co-optimized sintering parameters. The SEM micrographs confirm that sintering temperature has pronounced effect on the densification and porosity reduction of LSCF6428 flat membranes.
Highlights
Dense La0.6Sr0.4Co0.2Fe0.8O3-ó (LSCF6428) perovskite-structured mixed ionicelectronic conducting (MIEC) ceramic membrane has attracted considerable attention due to its oxygen ion and electronic conductivity
The sintering behavior of the sintered pellets was evaluated by measuring the shrinkage rate, sintered density and porosity, which represents the variation of the ceramic properties as a function of sintering temperature, sintering time and heating rate
Increasing the sintering temperature parameter has resulted in the sharp increase of the shrinkage rate and sintered density as well as the decrease in the porosity
Summary
Dense La0.6Sr0.4Co0.2Fe0.8O3-ó (LSCF6428) perovskite-structured mixed ionicelectronic conducting (MIEC) ceramic membrane has attracted considerable attention due to its oxygen ion and electronic conductivity. It has excellent mechanical and chemical stability that finds its application in the oxygen separation membranes and membrane reactors at high temperatures. High density of the sintered membrane is desirable to avoid the presence of isolated and enclosed pores after sintering that could result to a drop in the oxygen flux. This happens due to the extended oxygen ion diffusion distance or the large resistance induced by the many recycles of surface reactions [2]. It has been reported previously that the densification and microstructural evolution with different sintering conditions are interrelated to the variation of the mixed conduction properties of perovskite-structured MIEC membranes [3,4,5,6,7,8]
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