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Journal of Sol-Gel Science and Technology

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11-05-2022 | Original Paper: Nano-structured materials (particles, fibers, colloids, composites, etc.)

Preparation of a dense alumina fiber with nanograins by a novel two-step calcination

Authors: Yunzhu Ma, Shaoheng Peng, Wensheng Liu, Shuwei Yao, Juan Wang

Published in: Journal of Sol-Gel Science and Technology | Issue 1/2022

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Abstract

Controlling the density and the nanograin size is challenging but essential to prepare continuous alumina fibers with excellent performance. In this study, the continuous alumina fibers were prepared using the sol-gel method. The fibers calcined under different conditions were characterized to reveal the effect of calcining conditions on the fiber microstructure evolution. The results show that the phase transformation from amorphous Al₂O₃ to γ-Al₂O₃ and then to α-Al₂O₃ takes place during the calcining process. The fiber, prepared using a single-step calcining method, cannot obtain a fully dense and nanocrystal microstructure through optimizing the calcination conditions. Thus, a novel two-step calcining process was proposed, through which an almost fully dense α-Al₂O₃ fiber with an average grain size of ~150 nm was prepared and the tensile strength of fibers reaches 2.2 GPa. Based on the results, the effect mechanism of residual organics, phase transformation, densifying, and grain growth on the fiber microstructure evolution was discussed in depth.

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Title: Preparation of a dense alumina fiber with nanograins by a novel two-step calcination
Authors: Yunzhu Ma
Shaoheng Peng
Wensheng Liu
Shuwei Yao
Juan Wang
Publication date: 11-05-2022
Publisher: Springer US
Published in: Journal of Sol-Gel Science and Technology / Issue 1/2022
Print ISSN: 0928-0707
Electronic ISSN: 1573-4846
DOI: https://doi.org/10.1007/s10971-022-05813-0

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