Nanopowder and Fine-Grained Ceramics for Multilayer PTCR Elements
BaTiO3 nanopowders prepared by sol-gel process were used for multilayer PTCR ceramics in order to utilize grain boundary effect and lower sintering temperature.The precursor gel was calcined at different temperatures and the powders were characterized by XRD and TEM.The average grain size was about 26nm when calcined at 800℃ for 2h.Effects of acceptor/donor concentration and sintering temperature on PTCR ceramics were also investigated.The optimal concentration of the donor was found to be 0.6mol with the acceptor concentration being 1/8 of the donor.Multilayer PTCR elements were fabricated by tape-casting technique.The jump ratio of PTCR chips sintered at 1240℃ was above 103 with the average grain size smaller than 1~2 μm,which is suitable for the multilayer PTCR elements.
Sol-gel Nanopowder PTCR Sintering temperature
Jun Zhao Shuping Gong Chunfang Cheng Zhiping Zheng Huan Liu Dongxiang Zhou
Engineering Research Center for Functional Ceramics of the Ministry of Education,Department of Electronic Science & Technology,Huazhong University of Science & Technology,Wuhan 430074,P.R.China
国际会议
The Fifth China International Conference on High-Performance Ceramics (第五届先进陶瓷国际研讨会(CICC-5))
长沙
英文
453-455
2007-05-10（万方平台首次上网日期，不代表论文的发表时间）