Fabrication of YSZ Tubes Consisted of Dense and Porous Layers for Solid Oxide Fuel Cell by the Slip Casting

Abstract

The process of fabricating yttria-stabilized zirconia (YSZ) tubes consisted of dense and porous layers for solid oxide fuel cell by the slip casting has been discussed. Two types of YSZ powders having different agglomerate particle sizes were used. The size of dispersed YSZ particles was controlled by changing the milling time of YSZ slips, YSZ green bodies consisted of two layers were formed by the slip casting. During the drying process in an ambient atmosphere, no delamination of layers developed for similar permeabilites of dense and porous layers, The sintered YSZ material having dense and porous layers with ralative densities of 96 and 70%, respectively, was obtained by firing at 1300°C for 100min. Because of a similarity of the densification rates of each layer in the early stage of sintering, cracks or defects were not observed in the sintered body, A YSZ tube consisted of dense and porous layers for SOFC was fabricated. The dense layer of electrolyte was 50μm.