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Journal of Materials Science

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01-01-2010

Synthesis and formation of alumina whiskers from hydrothermal solution

Authors: Jie Li, Wu Li, Xueying Nai, Shaoju Bian, Xin Liu, Ming Wei

Published in: Journal of Materials Science | Issue 1/2010

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Abstract

Al₂O₃ whiskers with an average length of 5 μm have been synthesized from hydrothermal solution. Al(NO₃)₃ and urea were mixed and put into a Teflon-lined stainless steel autoclave and then treated at 120 °C to fabricate precursor whiskers NH₄Al(OH)₂CO₃ (AACH). AACH whiskers were heated at 1200 °C in a furnace to obtain Al₂O₃ whiskers. The time-dependent examinations revealed that the formation process of AACH whiskers involves two sequential processes: a short liquid–solid deposition process in the initial stage and a long Ostwald ripening process. During calcinations, AACH transforms to amorphism then to α-Al₂O₃. The escape of NH₃ and CO₂ induced the distortion and toothlike morphology on the surface of the Al₂O₃ whiskers.

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Title: Synthesis and formation of alumina whiskers from hydrothermal solution
Authors: Jie Li
Wu Li
Xueying Nai
Shaoju Bian
Xin Liu
Ming Wei
Publication date: 01-01-2010
Publisher: Springer US
Published in: Journal of Materials Science / Issue 1/2010
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI: https://doi.org/10.1007/s10853-009-3913-x

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