1王凯1范桂芬1金善龙1吴秋晨1曾子庆1吕文中2李晨辉
(1华中科技大学光学与电子信息学院，电子信息材料教育部重点实验室，武汉430074)
（2华中科技大学材料科学与工程学院武汉 430074）
关键词：氧化铝；微波介电性能；耐压性能；CaO-SiO2-MgO
中图分类号：TQ174 文献标识码：A
摘要：采用传统固相反应法制备了CaO-SiO2-MgO掺杂氧化铝陶瓷。研究了烧结助剂CaO-SiO2-MgO的氧化物配比对氧化铝陶瓷相组成、微波和耐压性能的影响。XRD图谱表明，助烧剂CMS中，MgO含量为18.6wt%，当SiO2/CaO质量比在1.6~2.0范围内，氧化铝陶瓷中杂相的含量较少，且陶瓷的致密度和耐压强度获得最优值。陶瓷的介电性能随质量比的增加呈现逐渐下降的趋势。当质量比为1.8时，陶瓷样品可以获得较优的综合性能：Eb=29kV/mm, er=9.06, Qf=17500GHz。
Effect of CaO-SiO2-MgO on microwave andwithstand voltage properties of alumina ceramics
1Wang Kai, 1FanGuifen, 1Jin Shanlong, 1Wu Qiuchen, 1ZengZiqing, 1Lv Wenzhong, 2Li Chenhui
(1School of optical and electronic information, Key Lab ofFunctional Materials For Electronic Information, MOE, Huazhong University ofScience and Technology, Wuhan 430074, PR China)
(2School of materials science and engineering, HuazhongUniversity of Science and Technology, Wuhan 430074, PR China)
Keywords: Al2O3；microwavedielectric properties；dielectric breakdown strength；CaO-SiO2-MgO
Abstract:CaO-SiO2-MgOdoped Al2O3 ceramics were prepared by conventional solid-statereaction method. The effects of each oxide on the phase compositions, microwaveproperties and dielectric breakdown strength of Al2O3ceramics were studied. The XRD patterns show that in the sintering assistant,when the content of MgO is 18.6% and the mass radio of SiO2/CaO isbetween 1.6~2.0, the Al2O3 ceramics have less impurityphases, and the optimum values of density and dielectric breakdown strength areobtained. The dielectric properties of the ceramicsshow a decreasing trend with the increase of mass ratio of SiO2/CaO. When the mass radio of SiO2/CaO is 1.8, the integrated performanceof samples are the best: Eb=29 kV/mm, er=9.06, Qf=17 500 GHz.