Agglomerate control in the complexing sol-gel process

来源期刊：中国有色金属学报(英文版)1999年第4期

论文作者：尹邦跃 王零森 樊毅 张金生

文章页码：712 - 716

Key words：complexing; EDTA; sol-gel process; ZrO₂ (Y₂ O₃ ); agglomeration

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 400 ℃ for 2 h and 700 ℃ 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.