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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 9    No. 4    December 1999

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Agglomerate control in the complexing sol-gel process
Yin Bangyao(尹邦跃); Wang Lingsen(王零森); Fan Yi(樊毅); Zhang Jinsheng(张金生)

State Key Laboratory for Powder Metallurgy; Central South University of Technology; Changsha 410083; P. R. China

Abstract:Nanometer ZrO2 - 8% Y2O3 (mole fraction, % ) powders were prepared by the EDTA (ethylenediaminetetraacetic acid) sol-gel process. Effects of the addition of ethylene glycol on agglomerate control was investigated. The results showed that because of the replacement of hydrogen bonds with ethylene glycol in the polymerized gel, gel stabilization and homogeneity were improved and close approach of gel particles was prevented, which led to reduction of hard agglomerates to some extent. Calcined at 4OO t for 2 h and 700 C for 2 h, the powders had a specific surface area of 35 m2/g, average particle size of 28 nm, and median particle size (d50) of 0. 44um with very sharp distribution, mostly being soft agglomerates.

 

Key words:  complexing; EDTA; sol-gel process; ZrO_2 (Y_2O_3); agglomeration

ISSN 1672-7029
CN 43-1423/U

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