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http://dx.doi.org/10.6111/JKCGCT.2022.32.6.231

Grain growth behavior of porous Al2O3 with addition of La2O3 prepared via freeze-casting  

Kim, Sung-Hyun (School of Materials Science and Engineering, Changwon National University)
Woo, Jong-Won (School of Materials Science and Engineering, Changwon National University)
Jeon, Sang-Chae (School of Materials Science and Engineering, Changwon National University)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.32, no.6, 2022 , pp. 231-238 More about this Journal
Abstract
To secure the mechanical strength of porous Al2O3 ceramics, which can be utilized for filters and catalyst supports is essential for their functionality and durability. Superior mechanical strength would be obtained by tailoring the densification and grain growth during sintering. This study deals with grain growth behavior of a freeze-casted Al2O3 with addition of La2O3. In a temperature range between 1400 and 1600℃, variations of average grain size with sintering time and temperature were observed and analyzed with Gtn-G0n = kt and with k = k0exp(-Ea/RT). As a result, n value and activation energy (Ea) for grain growth were calculated as 3 and 489.09 kJ/mol, respectively. These commonly confirms retardation effect of the La addition during sintering of Al2O3 porous structure. More accurate analysis on the La effect can be followed to provide useful guidance for the selection of additives for better mechanical strength in Al2O3 porous structures.
Keywords
Porous ceramics; Freeze-casting; $Al_2O_3$; Sintering; Grain growth behavior;
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