Abstract
Yttria stabilized zirconia (YSZ) film has been screen printed and sintered on a rigid substrate. The constrained sintering caused the formation of multiple microcracks and most critically large “blister” defects. The morphology of such defects has been characterized by scanning electron microscopy (SEM). It was revealed that the film surface exhibits noticeable roughness. Microhardness testing revealed little variation in green density distribution. Rheological measurement, however, showed that some agglomerations are present in the YSZ ink. The existence of agglomerations in the screen printing ink in combination with debonding at the film/substrate interface is potentially the cause for the formation of blister defects.
Highlights
IntroductionIn fabricating solid oxide fuel cell (SOFC) layer, anode, electrolyte and other layers have to be sintered together
Sintering of films is a necessary processing stage in many industrial applications
It is believed that these defects are formed due to the tensile stresses developed during sintering due to the constraint applied by the substrate
Summary
In fabricating solid oxide fuel cell (SOFC) layer, anode, electrolyte and other layers have to be sintered together. In anode supported fuel cell, anode and electrolyte are co-sintered with the potential result of warpage if sintering is not well controlled [1,2]. When the green compact is not uniformly packed, the dense regions may act as hard inclusions in hindering the sintering of the surrounding matrix and desintering can result. This phenomenon is observed in every sintered body, it is mostly obvious in layered structures when multiple layers are deposited onto a rigid substrate.
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