微波辅助制备复合多铁性材料及性能研究

发布时间：2018-04-30 04:05

  本文选题：微波烧结 + CoFe_2O_4/BaTiO_3　； 参考：《上海应用技术大学》2017年硕士论文

【摘要】：多铁性材料是指同时包含两种及两种以上铁的基本性能的材料。近年来,复合多铁性材料成为了国内外研究的热点,在磁电传感器、数据存储器、压电换能器等方面都有很大的应用价值。微波烧结是新一代烧结方法,是近年来迅速发展起来的一种快速烧结陶瓷的新技术。与常规烧结相比,它具有烧结温度低、烧结时间短、加热效率高、安全无污染等特点,并且在陶瓷性能方面微波烧结也优于常规烧结。本论文选取CoFe_2O_4/BaTiO_3为研究对象,采用微波辅助烧结的方式,研究了不同烧结温度、不同复合比例等因素对材料结构性能的影响。具体内容及主要结论如下:1.采用溶胶凝胶法分别制备铁电相BaTi03粉体和铁磁相CoFe_2O_4粉体,通过改变煅烧温度、保温时间、分散剂的含量等几个因素,探索出最佳的制备BaTiO_3粉体的条件为煅烧温度选取1000℃,保温时间选取1h,分散剂聚乙二醇6000的含量选取5%;最佳的制备CoFe_2O_4粉体的条件为煅烧温度选取700℃,保温时间选取2h。2.选择最佳条件下制备得到的BaTiO_3粉末和CoFe_2O_4粉末,进行复合多铁性材料CoFe_2O_4/BaTiO_3的研究。通过改变锻烧温度、保温时间等几个因素,对CoFe_2O_4/BaTiO_3陶瓷进行铁电性能、铁磁性能等研究。本论文采取了微波辅助烧结溶胶凝胶法和微波辅助烧结粉末混合法两种方法制备CoFe_2O_4/BaTiO_3复合陶瓷。两种方法制备的CoFe_2O_4/BaTiO_3陶瓷样品内部都会存在一些小的气孔,样品并没有完全致密化,其中,微波辅助烧结粉末混合法制备的CoFe_2O_4/BaTiO_3陶瓷的致密度要稍微差一些。但是两种不同的复合方式制备得到的CoFe_2O_4/BaTiO_3陶瓷致密度比常规烧结要高,而且烧结时间大幅度缩短。对比两种方式制备的CoFe_2O_4/BaTiO_3陶瓷的磁性能和铁电性能,可以看出在其它条件相同的情况下微波辅助烧结粉末混合法制备的CoFe_2O_4/BaTiO_3陶瓷比微波辅助烧结溶胶凝胶法制备的CoFe_2O_4/BaTiO_3陶瓷的磁性能和铁电性能都要好一些。
[Abstract]:Multi-iron materials are materials that contain two or more basic properties of iron at the same time. In recent years, composite multi-iron materials have become a hot research topic at home and abroad, and have great application value in magnetoelectric sensors, data storage, piezoelectric transducers and so on. Microwave sintering is a new generation sintering method and a new technology of rapid sintering ceramics developed rapidly in recent years. Compared with conventional sintering, it has the advantages of low sintering temperature, short sintering time, high heating efficiency, safety and no pollution, and microwave sintering is superior to conventional sintering in ceramic properties. In this paper, CoFe_2O_4/BaTiO_3 was chosen as the research object, and the effects of different sintering temperature and different composition ratio on the structure and properties of the materials were studied by microwave assisted sintering. The specific contents and main conclusions are as follows: 1. Ferroelectric phase BaTi03 powder and ferromagnetic phase CoFe_2O_4 powder were prepared by sol-gel method. By changing the calcination temperature, holding time, dispersant content and other factors, the optimum conditions for preparing BaTiO_3 powder were found to be 1000 鈩，

本文编号：1822979