工艺对中温烧结高介高稳定MLC介质电性能的影响.pdf

硅酸盐通报990102 硅酸盐通报 BULLETIN OF THE CHINESE CERAMIC SOCIETY 1999年 第1期 No.1 1999 工艺对中温烧结高介高稳定MLC介质电性能的影响 谢　磊　吴霞宛　王洪儒　董向红 摘　要：研究了工艺对BaTiO 基、中温烧结的高介高稳定MLC介质系统电性能的影 3 响。随着BaTiO 3合成温度的提高，系统介电系数先升后降，介电系数的变化率一直呈 上升趋势，过烧时，瓷料系统的ε-T曲线会成单峰，采用硬度高的锆球作磨球，有助 于提高瓷料的介电系数，降低介电系数的变化率。 关键词：中温烧结，高介高稳定，MLC介质，工艺 The Effects of Process Technology on the Dielectric Properties of High-Permittivity High-Stability MLC Sintered at Intermediate Temperature Xie Lei　Wu Xiawan　Wang Hongru　Dong Xianghong (Tianjin University) Abstract:The effects of process technology on the dielectric properties of BaTiO3-based X7R-MLC dielectric system sintered at intermediate temperature were investigated.With the increase of the synthesizing temperature of barium titanate,the dielectric constant of the system increased at first and decreased later,but its change rate increased all the time.Too high sintering temperature would lead to the single peak of the ε-T curve of the ceramic system.Using zirconia milling ball with high hardness was good for increasing the dielectric constant and decreasing its change rate. Key words:intermediate-temperature sintering,high permittivity and high stability,MLC dielectrics,process 1.前言 　　X7R*　MLC ** 介质是高介高稳定介质最具有实用价值的品种之一。它要求在较宽 的工作温度范围内(-55℃～+125℃)介电系数(ε)保持在较高的水平上，而介电系数变 化率(△ε/ε)需≤+15%。这种介质制成的电容器广泛用于移动电话等高档电子设备的 耦合电路。耦合电路前后级传输过程中，信号的失真应尽可能的小，须采用大容量、 万方数据 file:///E|/qk/gsytb/gsyt99/gsyt9901/990102.htm（第 1／11 页）2010-3-22 20:23:54 硅酸盐通报990102 高热稳定的电容器作为耦合器件。国内外许多研究人员对X7R MLC瓷料进行了广泛深 入的研究。以BaTiO为基的系统有许多优越的性能。但BaTiO介电系数随温度变化极 3 3 为剧烈，必须对