NANOCOMPOSITE DOPED BaTiO3-BASED ULTRAFINE DIELECTRICSFOR MULTILAYER CERAMIC CAPACITANCE
-
摘要: 采用新颖的纳米掺杂工艺成功制备了BaTiO3 基MLCC 超细抗还原瓷料。TG-DTA、XRD、TEM 分析表明, 通过水基溶胶-凝胶法合成了高分散、高活性的纳米掺杂剂, 平均粒度约40.2 nm。根据传统工艺与纳米掺杂工艺的比较, 对纳米掺杂机理进行了研究。实验发现, 由于纳米粉体的特殊效应, 纳米掺杂工艺能更有效地提高掺杂原子的取代改性作用, 从而更显著地改善瓷料的微观结构和宏观介电性能。样品经测试符合EIAX7R/ X8R 标准, 其介电常数K25 ℃ > 2800 、介质损耗tanδ< 110 %、绝缘电阻率I R = 10.2 Ω ·cm、平均晶粒尺寸Gav≈0.3μm。Abstract: A novel nano-doping process was int roduced for the preparation of Ba TiO3-based ult rafine nonreducibledielect rics for multilayer ceramic capacitance (MLCC) . According to TG-DTA , XRD and TEM analysis , the nano-dopant prepared by the water-based sol-gel method was well dispersive and active. The nano-doping mechanism wasinvestigated based on comparing conventional process with nano-doping process. It indicated that due to the specialnano-effect , the modification effect of foreign atom was improved effectively and the microst ructure and macro dielect ric characteristics of so acquired ceramics were improved consequently. The result s show that high performancedielect rics are obtained , with permittivity more than 2800 , dielect ric loss lower than 110 % and average grain size about 0.3μm , which satisfies the requirement s of EIA X7R/ X8R specifications.
-
-
计量
- 文章访问数: 2511
- HTML全文浏览量: 79
- PDF下载量: 1336
下载:
