MnO2掺杂LiTaO3陶瓷的烧结机理与力学性能  

Sintering Mechanism and Mechanical Properties of MnO2 Doped LiTaO3

作　　者：王烨 张有凤[1] 任江伟[1] 孔海娟[1] 陈学锋[2] WANG Ye;ZHANG Youfeng;REN Jiangwei;KONG Haijuan;CHEN Xuefeng(Shanghai University of Engineering Science,School of Material Engineering,Shanghai 201620,China;Key Laboratory of Inorganic Functional Materials and Devices,Shanghai Institute of Ceramics,Chinese Academy of Sciences, Shanghai 200050,China)

机构地区：[1]上海工程技术大学材料工程学院,上海201620 [2]中国科学院上海硅酸盐研究所,中国科学院无机功能材料与器件重点实验室,上海200050

出　　处：《硅酸盐学报》2018年第12期1722-1726,共5页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(11604204;51603120);中国科学院无机功能材料与器件重点实验室开放课题(KLIFMD201601);上海工程技术大学研究生科研创新项目(17KY0518)

摘　　要：采用无压烧结法制备了添加MnO2粉末的LiTaO3基陶瓷复合材料,研究无压烧结后样品的显微组织和力学性能,结果表明:MnO2能够有效促进晶粒的长大,改善LiTaO3基陶瓷复合材料烧结性;1 300℃保温3 h无压烧结后,随着MnO2质量分数的增加,LiTaO3基陶瓷复合材料的烧结性增强,添加4%(质量分数) MnO2制备的陶瓷复合材料烧结性较好;陶瓷复合材料的收缩率和Vickers硬度都先增大后减小,并在4%MnO2时达到最大,分别为25.7%和392.5 MPa;MnO2在烧结后以Mn3O4的形式存在。LiTaO3 based ceramics with a manganese oxide powder were prepared via pressureless sintering. The microstructure and mechanical properties of the composites were investigated. The grain growth and sinterability of ceramics are promoted by adding MnO2. The sintering properties of LiTaO3 based ceramics sintered at 1 300 ℃ for 3 h increase with the increase of MnO2 content(in mass fraction). The optimum sinterability of ceramics prepared by adding MnO2 content of 4% can be obtained. The shrinkage of ceramic composites and the Vickers hardness first increase and then decrease, and the maximum values are 25.7% and 392.5 MPa when the MnO2 content is 4%. MnO2 presents as Mn3O4 after sintering.

关 键 词：烧结机理 二氧化锰掺杂 钽酸锂 硬度 

分 类 号：TQ17471[化学工程—陶瓷工业]