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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 9    No. 1    March 1999

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PREPARATION OF NANOMETER ZrO2-8%Y2O3POWDERS BY AZEOTROPIC DISTILLATION PROCESSING①
Yin Bangyao, Wang Lingsen, Zhang Jinshen, Huan Yi, Yang Yong and Ling Jianliang
State Key Laboratoryfor Powder Metallurgy,

Central South University of Technology, Changsha 410083, P. R. China

Abstract:Gels of Zr(OH)4and Y(OH)3, prepared by the chemical coprecipitation method, were effectively dehydrated by the azeotropic distillation processing. Because of the removal of interparticle free water, replacement of surface hydroxyl groups with butoxy groups and steric effects of n-butanol, colse approach of gel particles and Zr-O-Zr chemical bond formation between them were prevented. Nanometer ZrO2-8%(mole fraction, %)Y2O3powders prepared by this processing, with the average particle size of 16 nm, can be sintered to 98.5% TD at 1 450℃for 2 h with an average grain size of ceramic of 0.3μm.

 

Key words: ZrO2-8%Y2O3 nanometer powder chemical coprecipitation method azeotropic distillation hard agglomerate

ISSN 1672-7029
CN 43-1423/U

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