Low-temperature preparation of α-Al2O3 with the assistance of seeding a novel hydroxyl aluminum oxalate

α-Al2O3 with outstanding physical and chemical properties makes it an excellent feedstock to prepare advanced ceramics, but its preparation at low temperature still remains a challenging task. Herein, hydroxyl aluminum oxalate (HAO) with an average particle size of 196 nm was successfully prepared b...

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Bibliographic Details
Published in:Ceramics international 2023-06, Vol.49 (11), p.17305-17312
Main Authors: Chen, Haiyang, Ren, Bo, Ma, Qiao, Feng, Jisheng, Liu, Jie, Qin, Tingwei, Xue, Zejian, Xing, Yun, Yang, Xue, Chen, Junhong, Li, Bin
Format: Article
Language:English
Subjects:
Hydroxyl aluminum oxalate
Kinetic analysis
Morphologic evolution mechanism
Seed
α-Al2O3
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Summary:α-Al2O3 with outstanding physical and chemical properties makes it an excellent feedstock to prepare advanced ceramics, but its preparation at low temperature still remains a challenging task. Herein, hydroxyl aluminum oxalate (HAO) with an average particle size of 196 nm was successfully prepared by solvothermal reactions using 40 vol% ethanol aqueous solution (EAS) at 200 °C for 2.5 h. Meanwhile, HAO acting as seed was introduced into Al(OH)3 modified with oxalic acid (AHOD) for the first time. The results demonstrated that α-Al2O3 can be obtained by seeding 5% HAO at 900 °C and the initial nucleation temperature was as low as 780 °C. The morphologic evolution mechanism of obtained α-Al2O3 was proposed. Kinetic analysis displayed that the activation energy of γ-Al2O3 to α-Al2O3 after seeding 5% HAO was 197.01 kJ/mol.
ISSN:0272-8842
DOI:10.1016/j.ceramint.2023.02.097