MgTi_(2)O_(5)对钛酸铝陶瓷低温合成及性能的影响  

Effect of MgTi_(2)O_(5)on Low Temperature Synthesis and Properties of Aluminum Titanate Ceramics

作　　者：张宏泉[1] 程光健 文进[1] 陈鹏杰 ZHANG Hongquan;CHENG Guangjian;WEN Jin;CHEN Pengjie(School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China;Jieyang Hengcheng Ceramic Technology Co.,Ltd,Jieyang 515500,China)

机构地区：[1]武汉理工大学材料科学与工程学院,武汉430070 [2]揭阳恒成陶瓷科技有限公司,揭阳515500

出　　处：《硅酸盐通报》2024年第12期4545-4552,共8页Bulletin of the Chinese Ceramic Society

摘　　要：以预合成MgTi_(2)O_(5)和MgO+2TiO_(2)原位合成MgTi_(2)O_(5)两种方式引入钛酸铝陶瓷制备所需添加剂,研究MgTi_(2)O_(5)对钛酸铝陶瓷物相组成和性能的影响。结果表明,MgTi_(2)O_(5)或MgO+2TiO_(2)均可通过形成固溶体促进钛酸铝的低温合成,但添加少量MgTi_(2)O_(5)即可在较低温度下有效促进钛酸铝晶体的合成。当MgO含量为2%(摩尔分数)时,在1300℃下添加MgTi_(2)O_(5)的钛酸铝合成率比添加MgO+2TiO_(2)的提高了28.4个百分点;在钛酸铝合成率相近的前提下,添加MgTi_(2)O_(5)比添加MgO+2TiO_(2)的烧成温度低。当添加6%MgTi_(2)O_(5)时,在1280~1350℃所烧成陶瓷样品的热膨胀系数介于-0.11×10^(-6)~0.58×10^(-6)℃^(-1)。随着烧成温度升高,由于晶体的各向异性及过度生长,晶体内部存在的微裂纹易使所得钛酸铝陶瓷的抗折强度降低。In this paper,pre-synthesized MgTi_(2)O_(5)and MgO+2TiO_(2)in-situ synthesized MgTi_(2)O_(5)were introduced as the additives required for the preparation of aluminum titanate ceramics,and the effect of MgTi_(2)O_(5)on the phase composition and properties of aluminum titanate ceramics was studied.The results show that MgTi_(2)O_(5)or MgO+2TiO_(2)can promote the synthesis of aluminum titanate at low temperature by forming solid solution,the addition of a small amount of MgTi_(2)O_(5)can effectively promote the synthesis of aluminum titanate crystals at a lower temperature.When the MgO content is 2%(mole fraction),the synthesis rate of aluminum titanate added with MgTi_(2)O_(5)at 1300℃is 28.4 percentage point higher than that of MgO+2TiO_(2).On the premise of similar synthesis rate of aluminum titanate,the firing temperature of adding MgTi_(2)O_(5)is lower than that of adding MgO+2TiO_(2).When 6%MgTi_(2)O_(5)is added,the thermal expansion coefficient of the ceramic samples fired at 1280~1350℃is between-0.11×10^(-6)℃^(-1) and 0.58×10^(-6)℃^(-1).With the increase of firing temperature,due to the anisotropy and overgrowth of crystal,the microcracks inside crystal are easy to reduce the flexural strength of obtained aluminum titanate ceramics.

关 键 词：MgTi_(2)O_(5) 钛酸铝 低温合成 烧成温度 低热膨胀 晶体结构 

分 类 号：TQ174[化学工程—陶瓷工业]