TiO₂与Al₂O₃超细陶瓷材料的等离子体烧结制备工艺研究

【作者】 周果君；

【导师】 甘卫平；

【作者基本信息】 中南大学 ， 材料学， 2002， 硕士

【摘要】 等离子体烧结具有烧结速率极快、烧结温度高以及能量利用效率高等优点而成为新一代很有潜力的烧结工艺。本论文以等离子体(SPS)快速烧结工艺为研究背景,概要地介绍了这种烧结新技术的原理和特点以及在制备超细陶瓷方面的重要应用。 本论文研究了放电等离子超快速方法制备的超细二氧化钛、氧化铝和用SEM、TEM研究了在不同烧结温度下的纯超细二氧化钛、氧化铝陶瓷的显微结构特征。利用接触角测定手段研究了晶粒度、光照条件等因素对二氧化钛陶瓷材料的亲水性的影响。结果表明: 1.利用SPS技术快速烧结,通过对烧结气氛、温度、升温速率、压力和保温时间的优化选择,成功的制备出完整、致密的细晶粒氧化铝与二氧化钛陶瓷材料。 2.烧结温度是影响陶瓷材料致密化程度的关键因素,随着烧结温度的升高,试样的烧结收缩率和密度都是增大的,没有出现一般快速烧结方法中温度提高密度反而下降的现象。 3.亲水性受控于材料的晶粒大小;二氧化钛陶瓷材料亲水性对光照强度的响应呈阶跃特性。更多还原

【Abstract】 Owing to the extremely rapid rate of sintering, high temperature and very high energy efficiency, the spark plasma sintering is becoming one of the most potential material processing technology of the next generation .In the paper, with the background of studying spark plasma sintering（SPS）, and describes the principles and features and preparing super fine-grain ceramics of the SPS process.The paper study the preparation of super fine grain-TiO₂ ceramics and Al₂O₃ ceramics with spark plasma sintering . Study the microstructure of TiO₂ ceramics and Al₂O₃ ceramics in different sintering temperature ,affection of grain size and illumination condition to TiO₂-ceramics hydrophilicity with contact angle measure means. The results show:1.With SPS technology sintering atmosphere rising temperature speed sample inflicting pressure and holding time , It had prepared integrity compact fine grain-TiO₂ and fine grain-Al₂O₃ ceramics successfully.2.Sintering temperature is the key factor of affecting fine grain-ceramics density. Sintering shrinkage of the sample and density will augment when sintering temperature rise. Moreover, it won’t appear that the sample’s density decrease when the sintering temperature rise as like normal rapid sintering.3. .It was found that hydrophilicity is controlled by grain size and the hydrophilicity has a step-response to intensity of illumination.更多还原