烧结温度和铌、锰掺杂量对钛酸铅钡基高居里点PTC陶瓷阻温特性的影响  

Effect of Sintering Temperature and Nb,Mn Doping Amount on Temperature Resistance Characteristics of Lead Barium Titanate Based High Curie Point PTC Ceramics

作　　者：莫志伟 王焕平[1] 李登豪 林孝杰 马红萍 高照 蒋宗恒 徐时清[1] MO Zhiwei;WANG Huanping;LI Denghao;LIN Xiaojie;MA Hongping;GAO Zhao;JIANG Zongheng;XU Shiqing(Institute of Optoelectronic Materials and Devices,China Jiliang University,Hangzhou 310018,China;Haining Yongli Electronic Ceramics Co.,Ltd.,Haining 314415,China;School of Mechanical and Energy Engineering,Zhejiang University of Science and Technology,Hangzhou 310023,China)

机构地区：[1]中国计量大学光电材料与器件研究院,杭州310018 [2]海宁永力电子陶瓷有限公司,海宁314415 [3]浙江科技大学机械与能源工程学院,杭州310023

出　　处：《机械工程材料》2025年第3期29-35,共7页Materials For Mechanical Engineering

基　　金：浙江省科技计划资助项目(2023C01090)。

摘　　要：向钛酸钡陶瓷中掺入铅、锶、钙、铌、锰后,采用固相反应法制备了铌、锰共掺钛酸铅钡基高居里点正温度系数(PTC)陶瓷,研究了不同烧结温度(1250~1310℃)下铌、锰的复合掺杂(物质的量分数分别为0.0020~0.0030,0.0008~0.0025)对陶瓷微观结构、体积密度和阻温特性的影响。结果表明:随着烧结温度的升高,掺杂不同物质的量分数锰或铌的陶瓷的体积密度均先升后降,当烧结温度在1290℃,体积密度均最大,结构均为纯钙钛矿结构。当烧结温度为1290℃时,随着锰掺杂量的增加,陶瓷的体积密度先升后降,晶粒尺寸增加,室温电阻率增大,升阻比和温度系数基本呈先增后减的趋势,居里温度稳定为271~280℃;随着铌掺杂量的增加,陶瓷的体积密度先增后减,晶粒尺寸减小,升阻比和温度系数先增大后减小,室温电阻率先减小后增大,居里温度稳定在270~281℃。当烧结温度为1290℃,掺杂锰和铌的物质的量分数分别为0.0010,0.0024时,陶瓷的阻温特性最佳,升阻比和温度系数最大,分别为7.011×10^(3)和20.19%,室温电阻率为2.13×10^(3)Ω·cm,居里温度为281℃,此时晶粒尺寸均匀,体积密度最大。The Nb-Mn Co-doped lead barium titanate based high Curie point positive temperature coefficient(PTC)ceramics were prepared by solid state reaction after adding lead,strontium,calcium,niobium and manganese into barium titanate ceramics.The effects of the composite doping of Nb and Mn(molar fraction of 0.0020‒0.0030,0.0008‒0.0025,respectively)on the microstructure,bulk density and temperature resistance characteristics of the ceramics under different sintering temperatures(1250‒1310℃)were studied.The results show that the bulk densities of ceramics doped with different molar fractions of Mn or Nb first increased and then decreased with the increase of sintering temperature.When the sintering temperature was 1290℃,the bulk densities were the largest,and their structures were all pure chalcocite structures.When the sintering temperature was 1290℃,with the increase of Mn doping amount,the bulk density of the ceramics first increased and then decreased,the grain size increased,the room temperature resistivity increased,the lift-off resistance ratio and the temperature coefficient basically first increased and then decreased,and the Curie temperature was stabilized at 271‒280℃.With the increase of Nb doping amount,the bulk density of the ceramics first increased and then decreased,the grain size decreased,the lift-off resistance ratio and temperature coefficient first increased and then decreased,the room temperature resistivity first decreased and then increased,and the Curie temperature was stabilized at 270‒281℃.When the sintering temperature was 1290℃,the molar fractions of doped Mn and Nb were 0.0010,0.0024,respectively,the temperature resistance characteristics of the ceramics were the best;the lift-off resistance ratio and temperature coefficient were the largest,which were 7.011×10^(3) and 20.19%,respectively,the room-temperature resistivity was 2.13×10^(3)Ω·cm,and the Curie temperature was 281℃.The excellent temperature resistance was ascribed to the uniform the grain size and the la

关 键 词：钛酸铅钡基PTC陶瓷 铌-锰共掺 高居里点 阻温特性 

分 类 号：TN373[电子电信—物理电子学]