低介电常数堇青石陶瓷的微结构调控与微波介电性能研究

项目名称： 低介电常数堇青石陶瓷的微结构调控与微波介电性能研究

项目编号： No.51202051

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 无机非金属材料学科

项目作者： 宋开新

作者单位： 杭州电子科技大学

项目金额： 25万元

中文摘要： 低介电常数硅酸盐陶瓷材料，在微波毫米波通信系统中具有广泛的应用前景，是近年国际微波介质陶瓷研究领域内的一个新兴方向。但是，在硅酸盐结构中，硅铝原子排列的有序性和晶格原子基元运动等微结构特征与微波介电性能的物性关联规律及其微波介电性能三参数(介电常数、品质因数与谐振频率温度系数)相互协调的机制问题尚未研究清楚。项目针对以上问题，经过筛选并选取堇青石为研究对象，提出采用元素掺杂，常压、SPS与HP烧结,制备(Mg1-xMx)2Al4Si5O18堇青石陶瓷(M=掺杂元素)；研究(Mg1-xMx)2Al4Si5O18堇青石陶瓷各微结构特征与微波介电性能的物性关联规律；并在此基础上，控制堇青石微结构，研究其微波介电性能三参数相互协调的工艺机制。本项目的开展将有助于丰富硅酸盐微波介电性能的物性认识与低介电常数微波介质陶瓷材料的种类，具有重要的自然科学研究内容与社会经济价值。

中文关键词： 微波陶瓷；低介电常数；堇青石；晶体结构；微波性能

英文摘要： Low dielectric constant silicate ceramics have a broad application prospect for microwave communication techniques, and are a new research direction in the fields of microwave dielectric ceramics. But, there still are some questions needed to research in the silicate materials, such as physical relating mechanism between silicate microstructures (Si/Al atomic arranging orders and crystal lattice atoms motion, etc) and microwave dielectric properties, and the mutual harmonization of three microwave dielectric characteristic parameters (dielectric constants, quality factors, and temperature coefficients of resonant frequency). In order to investigate these questions, the project selects cordierite as research objects, and uses elements doping and traditional ceramic sintering and special SPS/HP ceramic sintering methods prepare (Mg1-xAx)2(Al1-yBy)4Si5O18 cordierite ceramics. As followed, the project will research the physical rules between cordierite microstructures and microwave dielectric properties. Based on these rules, the projects will control cordierite ceramic microstructures, and research the technique mechanism of mutual hominization about three microwave dielectric characterictic parameters. If the projec had been done, the achievements would be beneficial to enrich the knowledge of physical theory abou

英文关键词： Microwave ceramics；Low permittivity；Cordierite；Crystal structure；Microwave property