毕业设计（论文）--添加BCB和NCB的CLST陶瓷的低温烧结.doc

添加BCB和NCB的CLST陶瓷的低温烧结 摘 要 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BaCu(B2O5)（简称BCB）和Na2O-CaO-B2O3（简称NCB）的固相合成工艺，以BaCO3、CuO和H3BO3为原料，在750℃保温2h,制得了高纯度的BCB。以Na2CO3、CaCO3和H3BO3为原料，在750℃保温5h,制得了高纯度的NCB。同时，把含量不同的NCB和4wt%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0%、0.5%、1%、2%、4%、6wt%的NCB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，不含有第二相。当NCB含量为2%时得到良好的介电性能：εr=87.04366，tanδ=0.0079，τf=112.8086ppm/℃。 关键词:CaO-Li2O-Sm2O3-TiO2，低温烧结，BCB，NCB，介电性能 Low Temperature Sintering of CLST Ceramics with the BCB and NCB Addition 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 BaCu (B2O5) (referred to as BCB) and Na2O-CaO-B2O3（referred to as NCB）of the solid-phase synthesis technology. We choosed BaCO3, CuO and H3BO3 as raw materal. At 750℃ insulation 2h, the system had high purity BCB. We choosed Na2CO3, CaCO3 and H3BO3 as raw materal. At 750 ℃ insulation 5h, the system had high purity NCB At the same time, different NCB content and 4wt% BCB 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 adding0%, 0.5%, 1%, 2%, 4%,6% of NCB, 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, no containing traces of the second phase. When the NCB content o