Thermal characteristic difference between α-Al2O3 and cristobalite powders during mullite synthesis induced by size reduction

Pei Ching Yu, Yung Wei Tsai, Fu Su Yen, Wan Ping Yang, Cheng Liang Huang

研究成果: Article

13 引文 斯高帕斯(Scopus)

摘要

The thermal behavior resulting from size reduction of α-Al2O3 and cristobalite powders during mullite formation were examined to understand the effects of the individual size reduction on the initiation and completion temperatures and the reaction rate of mullite formation. Both powders with particle sizes (D50) of approximately 200, 300, and 400nm were mixed at a stoichiometric composition of 3Al2O3·2SiO2 and thermally treated up to 1400-1600°C. The results indicated that the cristobalite amorphized in advance and then reacted with the α-Al2O3 particles. The size of α-Al2O3 particles determined that of the mullite particles formed. Decreasing α-Al2O3particles reduced the temperature of the amorphization and resulted in lowering and determining the temperature at which mullite formation initiated. While reducing the cristobalite sizes narrowed the temperature ranges of amorphization. It accelerated the rate of mullite formation, allowing the formation reaction to be completed at lower temperatures.

原文English
頁(從 - 到)673-680
頁數8
期刊Journal of the European Ceramic Society
35
發行號2
DOIs
出版狀態Published - 2015 二月 1

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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