氧化铜包覆边界层陶瓷电容器的研制

Study on Properties of GBBLC Coated with CuO

为了提高边界层陶瓷电容器(GBBLC)的性能,采用非匀相共沉淀法制备了包覆有CuO的BaTiO3粉体,加入B2O3、MgO以提高样品的性能,按照普通电子陶瓷的制备工艺制得一系列样品.测试了样品的密度和体积收缩率,对样品的显微结构进行了分析,讨论了部分样品的介电常数和介质损耗特性.结果表明:样品致密性得到明显改善,最大体积收缩率超过40%,介电常数最高超过7×104,介质损耗也明显降低;CuO、B2O3具有明显的促烧作用,烧结温度可降至1100℃,MgO可以提高样品的性能,使得气孔率明显减小,介电性能也大大提高.

BaTiO_3 particles coated with CuO were prepared by the heterogeneous precipitation method, and B_2O_3 ,MgO were added to improve the properties of the specimens. The samples of different prescriptions were obtained through conventional electrical ceramic process. The density, volumetric shrinkage of the samples were measured and the microstructure was studied, and the electrical properties of some specimens were also discussed.The delicate density of the specimens is 5.470 g/cm^3, with the maximum volumetric shrinkage over 40%, and the maximum dielectric constant beyond 7×10~4.Some beneficial conclusions could be drawn from the experiments:the sinter temperature can be reduced to 1100 ℃ with the help of B_2O_3 and CuO,and the electrical properties and microstructure can be improved by the addition of MgO.