毕业设计（论文）--添加Bi4ZnB2O10的CLST陶瓷的低温烧结.doc

添加Bi4ZnB2O10的CLST陶瓷的低温烧结 摩尔比为16：12：9：63的CaO-Li2O-Sm2O3-TiO2（简写为CLST）陶瓷是一种用于移动通讯介质谐振器的高介电常数微波介质陶瓷。为了实现电子元件和终端系统的小型化，需要CLST陶瓷与贱金属Ag、Cu实现低温共烧。本文优化了助烧剂Bi4ZnB2O10（简称BZB）的固相合成工艺，以Bi2O3、ZnO和H3BO3为原料，在750℃保温2h,制得了高纯度的BZB。同时，把含量不同的BCB加入到CLST陶瓷中，在不同温度下烧结，用X射线衍射仪（XRD），扫描电镜（SEM）和精密LCR测试仪研究了CLST微波介质陶瓷的晶相结构、晶粒形貌和介电性能。结果表明：加入2%、4%、6%、8%的BZB后，通过液相烧结机制，可使烧结温度由1300℃降低到1050℃，致密化程度提高。其主晶相具有钙钛矿结构，含有第二相。当BZB含量为6%时得到良好的介电性能： εr=69.53，tanδ=0.0259，τf = 28ppm /℃。 CaO-Li2O-Sm2O3-TiO2，低温烧结，Bi4ZnB2O10，介电性能Low Temperature Sintering of CLST Ceramics with added Bi4ZnB2O10 ABSTRACT 16:12:9:63 molar ratio of the CaO-Li2O-Sm2O3-TiO2 (referred as CLST) ceramics for mobile communications is a high permittivity microwave dielectric ceramics used as dielectric resonator. In order to achieve miniaturization of terminal systems, we need to co-fire CLST ceramics with base metals Ag, Cu at low temperature. This article helps to optimize the burning agent Bi4ZnB2O10 (referred to as BZB) of the solid-phase synthesis technology. We choosed Bi2O3, ZnO and H3BO3 as raw materal. At 750℃ insulation 2h, the system had high purity BZB. At the same time, different BZB added to the CLST ceramics, sintered at different temperatures, using X-ray diffraction (XRD), scanning electron microscopy (SEM) and Precision LCR Tester studied the microwave dielectric ceramics CLST crystalline structure, grain morphology and dielectric properties. The results showed that: by adding 2%, 4%, 6%, 8% of BZB, the mechanism through the liquid phase sintering, the sintering temperature can reduce from 1300℃ to 1050℃, the degree of densification to improve. Its main crystal phase with a perovskite structure, containing traces of the second phase. When the BZB content of 6% for the good dielectric properties: εr = 69.53, tanδ = 0.0259, τf = 28ppm /℃. KEY WORDS: CaO-Li2O-Sm2O3-TiO2, low-temperature sintering, Bi4ZnB2O10, dielectric properties 符号表 r 介电常数 介电损耗 频率温度系数 SEM Scanning Electron Microscope 扫描电子显微镜 XRD X ray diffraction