本文關鍵詞： 鈦酸鋇 溶膠-凝膠 納米 粉體　出處：《武漢工程大學》2010年碩士論文　論文類型：學位論文

【摘要】：鈦酸鋇電子陶瓷材料由于具有高的介電常數、良好的鐵電、壓電、耐壓及絕緣性能，是電子陶瓷領域應用最廣的材料之一。納米鈦酸鋇廣泛應用于制作正溫度系數熱敏電阻、多層陶瓷電容器、動態(tài)隨機存儲器和其它光電器件。為了制造高質量的陶瓷元件以滿足電子工業(yè)的發(fā)展，對鈦酸鋇粉體材料提出了越來越高的要求。因此，制備具有超細、高純、粒徑分布窄、團聚少的鈦酸鋇粉體的研究有著重要意義。 本文主要研究了以鈦酸丁酯和醋酸鋇為原料，采用溶膠-凝膠法制備納米鈦酸鋇粉體。 首先，文章重點討論了溶膠-凝膠法的特點和性能，，并指出目前國內外的制備納米鈦酸鋇粉體的現狀和發(fā)展方向，進而對現有的各種主要制備方法進行了詳細分析。 其次，詳細介紹了納米鈦酸鋇粉體的制備過程，并且借助X射線衍射分析、紅外吸收光譜和掃描電鏡等分析測試手段，系統(tǒng)地研究了加水量、水解溫度、溶劑用量、PH值、分散劑等因素對粉體粒徑、粉體活性、比表面積的影響，提出了制備過程中的理想工藝參數。如：pH=4；煅燒溫度800℃等,并分析了各種工藝參數的選擇依據。 最后，討論了納米材料的團聚，系統(tǒng)地研究了各種不同分散機理的分散劑的分散效果，選擇出了分散效果最佳的分散劑。 在摸索了多種工藝參數和條件后成功制備出平均粒徑為22nm、近似球形的粉體。與其它工藝相比，此工藝操作簡單、原料成本低且有效的縮短了反應時間。
[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

本文編號：1476723