摘要
采用高能球磨掺杂氧化物粉体和压敏陶瓷粉体2种不同制备技术制备ZnO-Bi2O3压敏陶瓷,通过扫描电镜和X-射线衍射对其显微组织和相成分进行分析,探讨不同高能球磨制备技术对氧化锌压敏陶瓷电性能和显微组织的影响。结果表明:压敏陶瓷粉体高能球磨是制备高性能氧化锌压敏陶瓷的一种优异的技术,在1000°C下烧结3h,压敏陶瓷的电位梯度为617V/mm,非线性系数为57;压敏陶瓷的致密度高达95%,显微组织均匀、致密;高能球磨压敏陶瓷粉体可细化晶粒,增强烧结驱动力,加速烧结过程,降低烧结温度。
ZnO varistor ceramics doped with Bi2O3, Sb2O3, CO2O3, Cr2O3, and MnO2 were prepared separately by two high-energy ball milling processes: oxide-doped and varistor ceramic powder. A comparison in the electrical and microstructural properties of the samples obtained by both methods was made. The best results on these characteristics were achieved through the high-energy ball milling varistor ceramic powder route, obtaining a nonlinear coefficient of 57 and a breakdown field of 617 V/mm at a sintering temperature of 1000 ℃ for 3 h. The samples synthesized by this technique show not only high density value, 95% of the theoretical density, but also a homogeneous microstructure, which compete with those obtained by the high-energy ball milling oxide-doped powder route. With the advantage that the high-energy ball milling varistor ceramic powder route can refine grain, increase the driving force of sintering, accelerate the sintering process, and reduce the sintering temperature.
基金
Project (BK2011243) supported by the Natural Science Foundation of Jiangsu Province,China
Project (EIPE11204) supported by the State Key Laboratory of Electrical Insulation and Power Equipment,China
Project (KF201104) supported by the State Key Laboratory of New Ceramic and Fine Processing,China
Project (KFJJ201105) supported by the Opening Project of State Key Laboratory of Electronic Thin Films and Integrated Devices,China
Project (2011-22) supported by State Key Laboratory of Inorganic Synthesis and Preparative Chemistry,China
Project (10KJD430002) supported by the Universities Natural Science Research Project of Jiangsu Province,China
Project (11JDG084) supported by the Research Foundation of Jiangsu University,China
关键词
压敏电阻
氧化锌
高能球磨
电性能
显微组织
varistor
ZnO
high-energy ball milling
electrical characteristic
microstructure