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

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2022, 32(6), pp.231-238
  • DOI : 10.6111/JKCGCT.2022.32.6.231
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering
  • Received : November 16, 2022
  • Accepted : November 25, 2022
  • Published : December 31, 2022

Sung-Hyun Kim 1 Jong-Won Woo 1 Sang-Chae Jeon 1

1창원대학교

Accredited

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 thedensification 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°C, variations of average grain size with sintering timeand temperature were observed and analyzed with G_{t}^{n}-G_{0}^{n}= 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.

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