中华医学超声杂志

应用化学 ›› 2010, Vol. 27 ›› Issue (08): 983-986.DOI: 10.3724/SP.J.1095.2010.90788

• 研究论文 • 上一篇    下一篇

前躯体-喷雾干燥法制备氧化铝超细粉体

徐兵1,2,赵惠忠1,2*,贺中央3   

  1. (1.武汉科技大学高温陶瓷与耐火材料国家重点实验室培育基地 武汉 430081;
    2.武汉科技大学纳米材料与技术中心 武汉 430081;
    3.濮阳濮耐高温材料有限公司 濮阳)
  • 收稿日期:2009-11-30 修回日期:2010-01-22 出版日期:2010-08-10 发布日期:2010-08-10
  • 通讯作者: 赵惠忠，男，教授，博士生导师; E-mail:wustnano@163.com; 研究方向：纳米材料的制备以及在耐火材料中的应用
  • 基金资助:
    国家自然科学基金(50774057)资助项目

Preparation of Al2O3-Superfine Powder by Precursor-Spray Drying Method

XU Bing1,2， ZHAO Hui-Zhong1,2*, HE Zhong-Yang3   

  1. (1.The State Key Laboratory Breeding Base of Refractories and Ceramics,
    Wuhan University of Science and Technology,Wuhan 430081;
    2.Center of Nano-Material and Technology,Wuhan University of Science and Technology,Wuhan 430081； 
    3.Puyang Refractories Group Co.,Ltd,Puyang)
  • Received:2009-11-30 Revised:2010-01-22 Published:2010-08-10 Online:2010-08-10

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2373

被引次数

1

摘要：

以六水氯化铝和氨水为原料，采用化学沉淀法结合喷雾干燥技术制备了氧化铝超细粉体。 实验结果表明，沉淀过程中反应体系的pH值对沉淀产物的结晶度有较大的影响。 采用喷雾干燥技术对前躯体进行干燥处理，将干燥后的粉体在管式炉中不同温度下进行煅烧，得到氧化铝超细粉体，用XRD、BET、SEM等测试技术对超细粉体性能进行了表征。 结果表明，在碱性条件下进行沉淀反应更有利于产物结晶度的提高；粉体在热处理过程的物相变化次序为：AlOOH→无定形氧化铝+γ-Al2O3→θ-Al2O3→α-Al2O3；通过喷雾干燥所得粉体，外形是规则的圆盘状或圆钵状，外形均一，无团聚，粒径分布范围窄，在4~10 μm之间，比表面积为391 m2/g，于1200 ℃、2 h处理后粉体的比表面积仍可达到185 m2/g。

关键词: 前躯体, 喷雾干燥法, 氧化铝, AlOOH, 超细粉体

Abstract:

The alumina superfine powder was preparated by chemical precipitation with AlCl3 and ammonia as raw material. Results show that the pH value of the precipitation process influences the crystallinity of productboehmite greatly. The precursor was dried by the spray drying technology, and the powder was calcined at different temperatures in a tubular furnace. Al2O3-superfine powder was tested by means of XRD, BET, and SEM, and so on. It shows that the higher pH value in the precipitation process is in favor of the raising of the product′s crystallinity. The order of phase change during calcination process is AlOOH→Amorphous-Al2O3+γ-Al2O3→θ-Al2O3→α-Al2O3. The powder obtained by spray drying has morphology of disc-shape or round bowl-shape with uniformity. The range of the particle size distribution is narrow, and the diameter of the powder is between 4 and 10 μm. The surface area of the powder is about 391 m2/g, and it can still reach 185 m2/g after calcining at 1200 ℃ for 2 h.

Key words: precursor, spray drying method, alumina, AlOOH, superfine powder

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