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<p>In sol-gel derived alumina-based fibers fabrication, precursor sol composition critically governs both spinning feasibility and thermally induced morphological/property evolution. This study systematically elucidates carboxylate-content-dependent phase transformation mechanisms and microstructural development in alumina-mullite fibers during thermal processing. Fibers derived from low-carboxylate sols developed γ-Al<sub>2</sub>O<sub>3</sub> phase following 800 °C sintering, with mullite nucleation emerging at 1300 °C. Subsequent 1400 °C treatment preserved dense fine-grained architectures. Contrastingly, high-carboxylate counterparts formed metastable tetragonal mullite at 700 °C, progressing to abnormal grain growth at 1000 °C. The underlying reasons for such substantial disparities are thoroughly discussed. The most fundamental cause is attributed to the fact that the different carboxylate contents lead to variations in the residual substances of the fibers after pyrolysis.</p> Graphical Abstract <p></p>

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Carboxylate content as a key driver of phase transition and microstructure evolution in alumina-mullite fibers

  • 期刊论文

  • 发表日期：

    2025年10月23日

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  • Qiang Liu,
  • Lingjiao Zhan,
  • Juan Wang,
  • Shuwei Yao,
  • Yunzhu Ma

摘要

In sol-gel derived alumina-based fibers fabrication, precursor sol composition critically governs both spinning feasibility and thermally induced morphological/property evolution. This study systematically elucidates carboxylate-content-dependent phase transformation mechanisms and microstructural development in alumina-mullite fibers during thermal processing. Fibers derived from low-carboxylate sols developed γ-Al2O3 phase following 800 °C sintering, with mullite nucleation emerging at 1300 °C. Subsequent 1400 °C treatment preserved dense fine-grained architectures. Contrastingly, high-carboxylate counterparts formed metastable tetragonal mullite at 700 °C, progressing to abnormal grain growth at 1000 °C. The underlying reasons for such substantial disparities are thoroughly discussed. The most fundamental cause is attributed to the fact that the different carboxylate contents lead to variations in the residual substances of the fibers after pyrolysis.

Graphical Abstract