Synthesis of Porous MgAl2O4 Fibers by Solid-state Reaction

doi:10.19691/j.cnki.1004-4493.2025.04.006

China's Refractories ›› 2025, Vol. 34 ›› Issue (4): 26-30.DOI: 10.19691/j.cnki.1004-4493.2025.04.006

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Synthesis of Porous MgAl₂O₄ Fibers by Solid-state Reaction

WANG Xinyue¹, XU Qing¹, ZHU Xinxin¹, ZHOU Ruiqi¹, DUAN Hongjuan^1,*, ZHANG Haijun¹, LI Shaoping²

1 State Key Laboratory of Advanced Refractories, Wuhan University of Science and Technology, Wuhan 430081, China;
2 Hubei Three Gorges Laboratory, Yichang 443007, China

Online:2025-12-15 Published:2026-01-04
Contact: *e-mail: duanhongjuan@wust.edu.cn
About author:Wang Xinyue, born in 1997, obtained her bachelor’s degree in materials science and engineering from Xi’an University of Architecture and Technology. Currently she has enrolled in a combined master’s and Ph. D. program in materials science and engineering at Wuhan University of Science and Technology. The research focuses on oxide aerogels, covering aspects such as preparation techniques, structural characteristics, and functional properties.

Abstract

Abstract: Chemical vapor deposition is the predominant method to prepare MgAl₂O₄ fibers. However, it faces several challenges, including exorbitantly high reaction temperatures, substantial production costs, and relatively low yields. In this study, porous MgAl₂O₄ fibers were fabricated through a solid-state reaction method, utilizing MgSO₄·5Mg(OH)₂·3H₂O whiskers as templates, mixed with either aluminum sol or α-Al₂O₃ micropowder. The impact of various parameters on the synthesis of porous MgAl₂O₄ fibres was systematically investigated, including the heat treatment temperature (1 000, 1 100 and 1 300 °C), the holding time (3 and 10 h) and the aluminum source (aluminum sol or α-Al₂O₃ micropowder). The results reveal that: (1) in comparison with fibers synthesized using α-Al₂O₃ as the aluminum source, those prepared with aluminum sol exhibit a significantly higher generation amount of MgAl₂O₄; (2) as the heat treatment temperature increases, Al₂O₃ gradually reacts with MgO, continuously increasing the formation amount of porous MgAl₂O₄ with small and uniformly distributed nanopores, and the synthesized porous MgAl₂O₄ fibres have small and uniform nanopores; (3) the optimal synthesis process involves using aluminum sol as the aluminum source and firing at 1 300 °C for 3 h.

Key words: MgSO₄·5Mg(OH)₂·3H₂O whiskers, aluminum sol, MgAl₂O₄, porous fibers, solid-state reaction method

WANG Xinyue, XU Qing, ZHU Xinxin, ZHOU Ruiqi, DUAN Hongjuan, ZHANG Haijun, LI Shaoping. Synthesis of Porous MgAl₂O₄ Fibers by Solid-state Reaction[J]. China's Refractories, 2025, 34(4): 26-30.

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Synthesis of Porous MgAl₂O₄ Fibers by Solid-state Reaction

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