高等学校化学学报 ›› 1998, Vol. 19 ›› Issue (4): 507.

• 论文 • 上一篇    下一篇

喷雾热解制备稀土超细粉末(Ⅰ)——氧化钇粒子形态与形成机理

赵新宇, 张煜, 古宏晨, 高玮   

  1. 华东理工大学技术化学物理研究所, 上海, 200237
  • 收稿日期:1997-06-24 出版日期:1998-04-24 发布日期:1998-04-24
  • 通讯作者: 古宏晨
  • 作者简介:赵新字,男,26岁,博士研究生.
  • 基金资助:

    国家自然科学基金

Synthesis of Rare Earth Ultrafine Powders by Spray Pyrolysis (Ⅰ) Particle Morphology and Formation Mechanism of Y2O3 Powder

ZHAO Xin-Yu, ZHANG Yu, GU Hong-Chen, GAO Wei   

  1. Institute of Technical Chemistry and Physics, East China University of Science and Technology, Shanghai, 200237
  • Received:1997-06-24 Online:1998-04-24 Published:1998-04-24

摘要: 对Y(NO3)3·6H2O的差热和热重分析表明,Y(NO3)3·6H2O经脱水和热分解在580C以上完全分解为Y2O3.在此基础上,以Y(NO3)3·6H2O为前驱体,采用喷雾热解过程制备出粒度为0.50~1.50μm的立方相球形Y2O3粉末.通过对产物粒子粒度的理论计算与实验结果的比较,推测Y2O3粒子形成机理符合液滴-粒子转变机理(One-Droplet-One-Particlemechanism).本喷雾热解过程同样适用于其它稀土超细粉末的制备,粒子粒度可以通过调节液滴尺寸和溶液浓度等操作条件进行控制.

关键词: 喷雾热解, 氧化钇, 超细粉末, 稀土

Abstract: Spray pyrolysis is a promising process for mass-production of high quality ultrafine powder. However, studies for preparation of rare earth powder by spray pyrolysis are relatively few until now. In this study the spray pyrolysis process was used to prepare Y2O3 ultrafine powder. First, the thermal properties of precursor Y(NO3)3·6H2O were determined by DTAand TG. It was indicated that Y(NO3)3·6H2Owas fully decomposed into Y2O3 above 580 ℃ at a heating rate 20 ℃/min. Based on the thermal analysis results, pure cubic phase Y2O3 powders with uniform size of 0.50~1.50 μm were prepared by spray pyrolysis from aqueous solution of Y(NO3)3·6H2O. The particle size can be adjusted by controlling the operation parameters such as droplet size and concentration of precursor solution. It was proposed that the formation mechanism of Y2O3 powders conforms with One-Droplet One-Particle mechanism(ODOP). This spray pyrolysis process can also be adapted to prepare other kinds of rare earth powders.

Key words: Spray pyrolysis, Y2O3, Ultrafine powders, Rare earth

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