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›› 2011, Vol. 11 ›› Issue (1): 137-142.

• 材料工程专栏 • 上一篇    下一篇

氢氧焰燃烧制备纳米Al2O3颗粒及其分散性能

丁宏秋 胡彦杰 李春忠   

  1. 华东理工大学材料科学与工程学院 华东理工大学材料科学与工程学院 华东理工大学超细材料制备与应用教育部重点实验室
  • 收稿日期:2010-12-09 修回日期:2011-01-18 出版日期:2011-02-20 发布日期:2011-02-20
  • 通讯作者: 李春忠

Preparation of Nano-Al2O3 Particles via H2/Air Flame Synthesis and Their Dispersion Performance

DING Hong-qiu， HU Yan-jie LI Chun-zhong   

  1. School of Materials Science and Engineering, East China University of Science & Technology School of Materials Science and Engineering，East China University of Science and Technology Key Laboratory For Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology
  • Received:2010-12-09 Revised:2011-01-18 Online:2011-02-20 Published:2011-02-20
  • Contact: LI Chun-zhong

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被引次数

7

摘要： 利用多重射流氢氧燃烧反应器，以AlCl3为前驱体制备了具有不同形貌和晶型结构的Al2O3纳米颗粒，表征了其形貌、晶型结构、比表面积、粒径分布等性能，考察了火焰燃烧形式和反应区最高温度等因素对颗粒性能的影响规律. 结果表明，随反应温度升高，Al2O3粒径不断长大，形貌从具有链状结构的不规则颗粒逐渐转变为分散性良好的球形颗粒；同时随反应温度升高和在高温火焰中停留时间延长，晶型由单纯g相逐渐转变为d和d*相. 产品纳米Al2O3颗粒具有较强亲水性，其分散液具有较好的稳定性. 探讨了高温快速反应过程中颗粒和团聚体的生长机理，最终产物的粒径和团聚体形貌取决于各主要影响条件的相互竞争.

关键词: 多重射流燃烧, 纳米Al2O3, 晶相转变, 生长机理

Abstract: Nano-Al2O3 particles were prepared via H2/air flame synthesis in a multi-jet reactor with anhydrous AlCl3 as precursor, the morphology, structure, crystallinity, size and specific surface area of the prepared nanoparticles were investigated, and the influences of flame configuration and maximum temperature in the reaction zone on their properties characterized. The results showed that the size of particles increased with the flame temperature increasing, and their morphology changed from irregular chain-like aggregates to well dispersed spherical nanoparticles. At the same time, a simple γ-phase was gradually transformed to δ and δ* phases. Dispersion of nano-Al2O3 particles had strong stability. The growth mechanism of particles and aggregates at rapid high-temperature reaction was discussed. The morphology and particle size of prepared nanoparticles depended on the competition among the key influential factors.

Key words: multi-jet flame combustion, nano-Al2O3, phase transformation, growth mechanism

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