Stereometric analysis of nanostructured boehmite coatings synthesized by aluminum nitride powder hydrolysis

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• 作者：Andra啪 Kocjan^a ; ^{a.kocjan@ijs.si} ; Milan Ambro啪i膷^b ; ^{milan.ambrozic@uni-mb.si} ; Toma啪 Kosma膷^a ; ^c ; ^{tomaz.kosmac@ijs.si}
• 关键词：Aluminum nitride ; Hydrolysis ; Boehmite ; Nanostructured coating ; Stereometric analysis
• 刊名：Ceramics International
• 出版年：2012
• 期刊代码：13_02728842
• 类别：ms
• 出版时间：August, 2012
• 卷：38
• 期：6
• 页码：4853-4859
• 文件大小：1400 K

摘要

We studied the morphological properties of precipitated, nanostructured, boehmite coatings on a polished alumina surface by exploiting the aluminum nitride (AlN) powder hydrolysis at elevated temperatures. The hydrolysis tests of the 3 wt%AlN powder suspensions in the temperature range 50-90 掳C were performed in order to estimate the time needed for the synthesis of the coatings. They consisted of interlocked boehmite lamellas, positioned perpendicularly to the ceramic surface, and they exhibited a strong temperature-dependent size and surface density. The aim of this research was a quantitative assessment of the as-formed boehmite coatings. Based on electron microscopy micrographs, a stereometric analysis of the as-prepared coatings was performed in order to estimate the relevant geometric parameters of the lamellas. In spite of the temperature-dependent lamellas鈥?size and surface density, the specific volume of the coatings was similar for all the synthesis temperatures.