Bi_(0.5)Na_(0.5)TiO_(3)和Bi_(0.5)K_(0.5)TiO_(3)含量对三元固溶体系无铅PTC热敏陶瓷性能的影响  

Influence of Content of Bi_(0.5)Na_(0.5)TiO_(3)andBi_(0.5)K_(0.5)TiO_(3)on the Properties of Lead-free PTC Ceramics of the Ternary Solid Solution System

作　　者：赵瑞钰 欧阳琪 马名生[2] 陆毅青[2] 魏红康 刘志甫[2] ZHAO Ruiyu;OUYANG Qi;MA Mingsheng;LU Yiqing;WEI Hongkang;LIU Zhifu(School of Materials Science and Engineering,Jingdezhen Ceramic University,Jingdezhen 333403,Jiangxi,China;Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China)

机构地区：[1]景德镇陶瓷大学材料科学与工程学院,江西景德镇333403 [2]中国科学院上海硅酸盐研究所,上海200050

出　　处：《材料导报》2023年第10期110-115,共6页Materials Reports

基　　金：上海市青年科技启明星计划项目(20QA1410200)。

摘　　要：PTC热敏陶瓷的无铅化是绿色智能加热及电路智能保护元件研制的重要前提。为了获得可在空气气氛下烧结且兼具高居里温度和高升阻比的无铅化PTC热敏陶瓷,本工作采用固相法制备了(1-x)BaTiO_(3)-0.5 x Bi_(0.5)Na_(0.5)TiO_(3)-0.5 x Bi_(0.5)K_(0.5)TiO_(3)和0.98BaTiO_(3)-0.02 y Bi0.5 Na_(0.5)TiO_(3)-0.02(1-y)Bi_(0.5)K_(0.5)TiO_(3)三元固溶体系无铅PTC热敏陶瓷材料,研究了不同含量的Na和K元素对无铅PTC热敏陶瓷材料的烧结特性和电学性能的影响。结果表明,BNT和BKT均与BaTiO_(3)形成固溶体,随着BNT含量的增加,PTC陶瓷平均晶粒尺寸减小,当BNT和BKT含量相同时,PTC陶瓷可以在较宽的烧结温度范围内实现半导化,且在空气气氛下烧结温度为1200℃的陶瓷样品具有最佳的PTC效应,其室温电阻率为128Ω·cm,升阻比为5个数量级,居里温度为142℃。Lead-free PTC thermosensitive ceramics are important electronic ceramic materials to realize green intelligent heating and intelligent protection circuit application.In order to obtain the lead-free PTC thermosensitive ceramics with high Curie temperature and high resistance jump that can be sintered in an air atmosphere,(1-x)BaTiO_(3)-0.5 x Bi_(0.5)Na_(0.5)TiO_(3)-0.5 x Bi_(0.5)K_(0.5)TiO_(3)and 0.98BaTiO_(3)-0.02 y Bi_(0.5)Na_(0.5)TiO_(3)-0.02(1-y)-Bi_(0.5)K_(0.5)TiO_(3)ternary solution system ceramics were prepared by the solid phase method,and the effects of different contents of Na and K elements on the sintering behavior and electrical properties of the PTC ceramics were studied.It is found that BNT and BKT formed solid solution with BaTiO_(3).The average grain size of PTC ceramics decreased with the increase of BNT content.When the contents of BNT and BKT are the same,the semi-conductance of PTC ceramics can be realized in a wide sintering temperature range,and the ceramic samples sintered at 1200℃in air atmosphere have the best PTC effect,which has a room-temperature resistivity of 128Ω·cm,resistance jump of about 5 orders,and Curie temperature of 142℃.

关 键 词：PTC陶瓷 无铅化 钛酸钡 三元固溶体系 交流阻抗谱 

分 类 号：TB34[一般工业技术—材料科学与工程]