Reactive Laser Ablation Synthesis of Nanosize Alumina Powder
作者:
Gregory P. Johnston,
Ross Muenchausen,
Douglas M. Smith,
William Fahrenholtz,
Steve Foltyn,
期刊:
Journal of the American Ceramic Society
(WILEY Available online 1992)
卷期:
Volume 75,
issue 12
页码: 3293-3298
ISSN:0002-7820
年代: 1992
DOI:10.1111/j.1151-2916.1992.tb04424.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
An aluminum (Al) target was laser ablated in an oxygen (O2) atmosphere, producing nanosize alumina (Al2O3) powder. The powder surface area decreased (and the particle size increased) with both increasing oxygen pressure and laser fluence. All powders produced had surface areas between 135 and 250 m2/g, corresponding to primary particle sizes ranging from 7 to 3 nm in radius. Phase evolution with temperature was studied via X‐ray diffraction. These powders showed a direct transformation from γ‐ to α‐alumina at approximately 1200°C, bypassing other transition alumina phases, while still maintaining small particle size ( 30 nm). Despite the nanosize particles, green densities equal to 54% of the skeletal density (i.e., true density of the solid phase) were obtained by uniaxial pressing a
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