Convection–diffusion derived gradient films on porous substrates and their microstructural characteristics
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By virtue of the convection–diffusion effect of solution in porous solid media, an alumina substrate-supported electrolyte film (YSZ) with gradient microstructure has been successfully fabricated for the first time and structurally characterized by SEM and XRD–ADA (angular dispersion analysis). This novel fabrication technique is simple, controllable, economical and potentially applicable to fabricating electrode-supported gradient electrolyte films for SOFCs. The so-prepared YSZ-film/substrate structures are featured with a dense YSZ film of ∼10 μm, a uniform filling layer of ∼50 μm just beneath the interface and a successive diffuse layer stretching as deep as ∼250 μm within the porous substrate matrix.
KeywordsFunctionally Grade Material Composite Cathode Porous Substrate Electrolyte Film Functionally Grade Material
The financial support from the Committee for Science and Technology of Jiangsu, P.R. China through Grant BK2002018, 2002 is gratefully acknowledged.
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