摘要
超细粉体具有常规材料难以比拟的优异性能,在生物制药、光学检测器等领域获得了广泛的应用,但由于稳定性低、易发生团聚和难于分散,需要对超细粉体进行适当的表面包覆处理以改善颗粒的表面特性和提高其分散性能,才能达到工业应用的要求。该文首先综述了库仑静电引力相互吸引等无机超细粉体的表面包覆机理及包覆原则,接着比较详细地介绍了超细粉体材料常用的表面包覆技术,包括固相法、液相法、气相法及其他新方法,并分析它们的优缺点。指出喷雾热分解法结合了气相法和液相法的优点,在超细粉体材料表面包覆方面具有广阔的工业应用前景。
Ultra-fine powders have a wide range of applications owing to their outstanding characteristics. Meanwhile, they have some defects, such as low stability, bad dispersivity and easy to agglomerate. Therefore, in order to meet the industrial requirements, it is necessary to coat the ultra-fine powders to change their surface properties and improve their dispersivity. In the present paper, the Coulomb＇s electrostatic attraction mechanism, chemical bonds mechanism and super-saturation mechanism, the basic principles of ultra-fine powders coating are simplely introduced. Then some surface coating technologies are synthetically described, including solid/gas/liquid phase methods and some novel methods, and the advantages/disadvantages of each method are also pointed out. On the basis of the above, it is proposed that the spray pyrolysis coating method is the hopeful technology for industrial applications.
出处
《粉末冶金材料科学与工程》
EI
2009年第1期1-6,共6页
Materials Science and Engineering of Powder Metallurgy
基金
国家自然科学基金资助项目(50704038)
教育部科学技术研究重点资助项目(108170)
关键词
超细粉体
表面包覆
机理
ultra-fine powder
surface coating
mechanism
