射频复合大功率铁氧体高频动态损耗机理研究

项目名称： 射频复合大功率铁氧体高频动态损耗机理研究

项目编号： No.51472045

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 一般工业技术

项目作者： 孙科

作者单位： 电子科技大学

项目金额： 83万元

中文摘要： 本项目针对低损耗射频复合大功率铁氧体制备及其高频动态损耗机理展开研究。研究内容包括：1）低损耗射频复合大功率铁氧体材料制备；2）高频动态损耗与磁谱间关系研究；3）高频动态损耗与磁畴形态间作用关系研究；4）高频动态损耗定量关系式确定。创新性的利用BST纳米晶植入MnZn铁氧体技术，形成钙钛矿-尖晶石相双相复合结构，结合复合添加剂交互作用，低温烧结射频复合大功率铁氧体材料；基于磁导率随频率的变化关系，研究磁损耗和储能以及壁移损耗和畴转损耗；明确高频动态损耗作用机理，研究损耗与晶粒尺寸关系以及畴壁势能、弹性能及动能；研究高频动态损耗关系式，明确斯坦梅兹系数和频率指数、涡流损耗定量关系式等。项目研究对于解决射频复合大功率铁氧体材料高频动态损耗与关键制备工艺、壁移损耗与畴转损耗、畴壁势能、弹性能与动能间关系以及高频动态损耗定量关系式确定四个科学问题有重要意义。

中文关键词： 复合铁氧体；高频；动态损耗；磁谱；磁畴

英文摘要： The project focuses on the preparation of the low-loss RF composite high-power ferrite and the study of its dynamic loss mechanism at high frequency. The study contents include: 1) Preparation of low-loss RF composite high-power ferrite materials; 2) The study on the relationship between the high-frequency dynamic loss and permeability spectra; 3)Research on the relationship between high-frequency dynamic loss and magnetic domain; 4) The determination of quantitative relationship of the high-frequency dynamic loss. Adopting an innovative technology in which the BST nanocrystalline is implanted to MnZn ferrite,which will form the perovskite-spinel phase composite structure, combined with the interaction of composite additives, the RF composite high-power ferrite materials are sintered at low temperature. According to the realationship that the permeability spectra changes with the frequency, the magnetic loss and energy storage, the domain-wall motion loss and domain rotation loss will be studied. The activity of the mechanism of the high-frequency dynamic loss will be cleared, and the potential energy of domain walls, elastic energy and kinetic energy as well as the relationship between loss and grain size will be studied. The Steinmetz coefficient and frequency index, and quantitative relationship of eddy current loss will be cleared through studying on the relationship of the high-frequency dynamic loss. This research project has great significance to solve four scientific issues which include the relationship between the high-frequency dynamic loss and the key preparation process, the dependence between the domain-wall movement loss and the domain rotaion loss, the relationship among the domain-wall potential energy, elastic energy and kinetic energy, and the determination of the quantitative relationship of the high-frequency dynamic loss.

英文关键词： composite ferrite;high frequency;dynamic loss;permeability spectra;magnetic domain