Microstructural comparison of porous oxide ceramics from the system Al₂O₃-ZrO₂ prepared with starch as a pore-forming agent

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• 作者：Zuzana 沤ivcová ; -Vl膷ková ; ^a ; ^b ; ^{zuzana.zivcova@jh-inst.cas.cz} ; Janis Locs^c ; Melanie Keuper^d ; Ivona Sedlá ; 艡ová ; ^e ; Michaela Chmelí ; 膷ková ; ^a
• 关键词：Casting ; Microstructure &ndash ; final ; Porosity ; Electron microscopy ; Al2O3 ; ZrO2
• 刊名：Journal of the European Ceramic Society
• 出版年：2012
• 期刊代码：53_09552219
• 类别：ms
• 出版时间：August, 2012
• 卷：32
• 期：10
• 页码：2163-2172
• 文件大小：1837 K

摘要

In this paper we show examples of microstructures of porous oxide ceramics prepared by traditional slip casting (TSC) and starch consolidation casting (SCC) and present results obtained using different microstructural characterization techniques; Archimedes method (open and total porosity), shrinkage measurement, mercury intrusion porosimetry (pore size distribution) and microscopic methods - optical microscopy with microscopic image analysis (pore size distribution) and scanning electron microscopy (detailed investigation of the local microstructure). In particular, microstructures are compared for porous ceramics from the system Al₂O₃-ZrO₂ prepared with rice and corn starch. It is shown that maximum values of the total porosity of porous ceramics prepared with starch as a pore-forming agent were approx. 50%. A major finding by using SEM with respect to starch-produced porous ceramics is the existence of pore fillings in the form of small sintered ceramic shell inside the pores, as a result of starch granule shrinkage during the drying and burn-out steps.