溶胶—凝胶法制备纳米钛酸钡工艺研究

发布时间：2018-01-30 16:42

  本文关键词： 钛酸钡 溶胶-凝胶 纳米 粉体　出处：《武汉工程大学》2010年硕士论文　论文类型：学位论文

【摘要】：钛酸钡电子陶瓷材料由于具有高的介电常数、良好的铁电、压电、耐压及绝缘性能，是电子陶瓷领域应用最广的材料之一。纳米钛酸钡广泛应用于制作正温度系数热敏电阻、多层陶瓷电容器、动态随机存储器和其它光电器件。为了制造高质量的陶瓷元件以满足电子工业的发展，对钛酸钡粉体材料提出了越来越高的要求。因此，制备具有超细、高纯、粒径分布窄、团聚少的钛酸钡粉体的研究有着重要意义。 本文主要研究了以钛酸丁酯和醋酸钡为原料，采用溶胶-凝胶法制备纳米钛酸钡粉体。 首先，文章重点讨论了溶胶-凝胶法的特点和性能，，并指出目前国内外的制备纳米钛酸钡粉体的现状和发展方向，进而对现有的各种主要制备方法进行了详细分析。 其次，详细介绍了纳米钛酸钡粉体的制备过程，并且借助X射线衍射分析、红外吸收光谱和扫描电镜等分析测试手段，系统地研究了加水量、水解温度、溶剂用量、PH值、分散剂等因素对粉体粒径、粉体活性、比表面积的影响，提出了制备过程中的理想工艺参数。如：pH=4；煅烧温度800℃等,并分析了各种工艺参数的选择依据。 最后，讨论了纳米材料的团聚，系统地研究了各种不同分散机理的分散剂的分散效果，选择出了分散效果最佳的分散剂。 在摸索了多种工艺参数和条件后成功制备出平均粒径为22nm、近似球形的粉体。与其它工艺相比，此工艺操作简单、原料成本低且有效的缩短了反应时间。
[Abstract]:Barium titanate electronic ceramic materials have high dielectric constant, good ferroelectric, piezoelectric, voltage and insulation properties. Nanocrystalline barium titanate is one of the most widely used materials in the field of electronic ceramics. Nanometer barium titanate is widely used to fabricate positive temperature coefficient thermistors and multilayer ceramic capacitors. Dynamic random access memory and other optoelectronic devices. In order to make high-quality ceramic components to meet the development of the electronic industry, barium titanate powder materials are increasingly demanding. Therefore, the preparation of ultra-fine, high-purity. The study of barium titanate powder with narrow particle size distribution and less agglomeration is of great significance. In this paper, nanometer barium titanate powder was prepared by sol-gel method using butyl titanate and barium acetate as raw materials. Firstly, the characteristics and properties of sol-gel method are discussed, and the present situation and development direction of preparing nanometer barium titanate powder at home and abroad are pointed out. The main preparation methods are analyzed in detail. Secondly, the preparation process of nano-barium titanate powder is introduced in detail, and the water addition and hydrolysis temperature are systematically studied by means of X-ray diffraction, infrared absorption spectrum and scanning electron microscope. The effects of the amount of solvent and dispersant on the particle size, activity and specific surface area of the powder were studied. The optimal technological parameters in the preparation process were proposed, such as: (1) pH ~ (4); The calcination temperature is 800 鈩

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