取向性六角铁氧体基多元吸波复合材料的制备及机理研究

The microwave absorption properties of the reported ferrite based microwave absorbing composites are not ideal due to the impedance mismatch resulted from their lower permeability compared with their permittivity. Based on the above-mentioned problem, we plan to introduce some soft magnetic ferrites, conductive microwave absorbing components, dielectric microwave absorbing components into oriented hexaferrites to prepare oriented hexaferrite based microwave absorbing composites via the methods of the synthesis of oxide powder, powder surface coating and tape casting technique. The solutions for enhancing the microwave absorption properties of ferrite based microwave absorbing composites will be developed through systematical investigation. The microwave absorption mechanism and magnetic exchange coupling mechanism of the microwave absorbing composites will be clarified. If this proposal can be carried out, it will contribute to the application of ferrite based microwave absorbing composites in the military and civil fields, and provide theory and practice experience for the development of new-typed microwave absorbing materials.

针对现有铁氧体基吸波复合材料的磁导率远小于其介电常数，从而导致阻抗匹配较差，吸波性能不够理想的问题，本项目以获得具有优异吸波性能的取向性六角铁氧体基吸波复合材料为研究目标。拟采用具有明显取向性排列的六角铁氧体材料为基体，将其与适量的尖晶石型软磁铁氧体进行复合，得到微波磁性能优异的硬磁软磁复合粉体，再在其中引入具有良好导电性的电导型吸波材料和介电型吸波材料，采用流延成型技术制备取向性六角铁氧体基多元吸波复合材料。系统研究提高铁氧体基吸波复合材料吸波性能的具体实验方案和工艺路线，获得吸收强、频带宽、厚度薄、质量轻的六角铁氧体基吸波复合材料，从而达到预期研究目标。揭示该类吸波材料的微波损耗机理及硬磁软磁交换耦合机理。本项目的顺利实施将大大推动铁氧体基吸波复合材料的实用化，有效提高其在军事、民用以及现代化生产等方面的应用，为促进新型吸波材料的发展增添新理论和实践基础。

针对现有铁氧体基吸波复合材料的磁导率远小于其介电常数，从而导致阻抗匹配较差，吸波性能不够理想的问题，本项目以获得具有优异吸波性能的取向性六角铁氧体基吸波复合材料为研究目标。采用具有明显取向性排列的六角铁氧体材料为基体，将其与适量的尖晶石型软磁铁氧体进行复合，得到微波磁性能优异的硬磁软磁复合粉体，再在其中引入具有良好导电性的电导型吸波材料（C或PANI）和介电型（ZnO或MoS2）吸波材料，制备了取向性六角铁氧体基多元吸波复合材料。系统研究了提高铁氧体基吸波复合材料吸波性能的具体实验方案和工艺路线，获得了吸收强、频带宽、厚度薄、质量轻的六角铁氧体基吸波复合材料，从而达到了预期研究目标。揭示了该类吸波材料的微波损耗机理及硬磁软磁交换耦合机理。该项目的实施为促进新型吸波材料的发展增添新理论和实践基础。