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<p>In order to verify the formation of gaseous phase fluoride and its influence on the morphological evolution and the growth mechanism of α-Al<sub>2</sub>O<sub>3</sub>, the α-phase transformation temperature and morphology of α-Al<sub>2</sub>O<sub>3</sub> powders from the calcination of commercial γ-Al<sub>2</sub>O<sub>3</sub> and Al(OH)<sub>3</sub> precursor with the addition of AlF<sub>3</sub>·3H<sub>2</sub>O additive have been studied through the incorporation of mixed placement experiments, layered placement experiments and separated placement experiments. The formation of gaseous phase fluoride has been experimentally confirmed by means of layered placement experiments and separated placement experiments, especially by the enhancement of the α-phase transformation occurred outside the small crucible in separated placement experiments. AlF<sub>3</sub>·3H<sub>2</sub>O additive significantly enhances shape anisotropy of α-Al<sub>2</sub>O<sub>3</sub> precursor and lowers the total α-transformation temperature (900&#xa0;°C for Al(OH)<sub>3</sub> precursor and 1100&#xa0;°C for γ-Al<sub>2</sub>O<sub>3</sub> precursor ), even though the commercial precursor and AlF<sub>3</sub>·3H<sub>2</sub>O additive has been completely isolated by small crucible with cover.</p>

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Effect of hydrated aluminium fluoride on phase transformation and morphology evolution of alumina

  • 期刊论文

  • 发表日期：

    2025年1月8日

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  • Ziyu Zhang,
  • Liang Zhang,
  • Lingling Zhu,
  • Mingtang Fu,
  • Heqi Qi,
  • Dong Zhang,
  • Zihan Zhao,
  • Shichen Xing,
  • Dongmo Wu

摘要

In order to verify the formation of gaseous phase fluoride and its influence on the morphological evolution and the growth mechanism of α-Al2O3, the α-phase transformation temperature and morphology of α-Al2O3 powders from the calcination of commercial γ-Al2O3 and Al(OH)3 precursor with the addition of AlF3·3H2O additive have been studied through the incorporation of mixed placement experiments, layered placement experiments and separated placement experiments. The formation of gaseous phase fluoride has been experimentally confirmed by means of layered placement experiments and separated placement experiments, especially by the enhancement of the α-phase transformation occurred outside the small crucible in separated placement experiments. AlF3·3H2O additive significantly enhances shape anisotropy of α-Al2O3 precursor and lowers the total α-transformation temperature (900 °C for Al(OH)3 precursor and 1100 °C for γ-Al2O3 precursor ), even though the commercial precursor and AlF3·3H2O additive has been completely isolated by small crucible with cover.