软磁复合材料的微观结构和性能研究

Investigation on Microstructure and Properties of Soft Magnetic Composites

本文采用Fe73.5Cu1Nb3Si13.5B9／为增强相，硅橡胶为基体材料制得Fe73.5Cu1Nb3Si13.5B9／硅橡胶软磁复合材料，利用X射线衍射仪（XRI））、CSS-3901D材料试验机和力磁耦合测试系统研究了Fe73.5Cu1Nb3Si13.5B9／硅橡胶软磁复合材料的微观组织和力学、磁学陛能，分析了环境温度、白炭黑体积含量以及热处理工艺对材料的微观组织、粘弹性力学性能、磁性能和显微组织的影响。结果表明，气相白碳黑含量对复合材料力学性能的影响较大，而非晶粉热处理工艺的影响较小；热处理后的材料的磁滞回线面积和矫顽力降低，而磁感应强度增加。因此，非晶粉经过550℃×30min的热处理不仅对能够实现非晶合金的纳米晶化，而且能够有效地改善软磁复合材料的磁性能。该研究为新型高灵敏度的压力传感器的开发设计提供了理论依据。

Fe73.5Cu1Nb3Si13.5B9/silicone rubber soft magnetic composites were prepared with silicone rubber as matrix material, Fe73.5Cu1Nb3Si13.5B9 powder as modifier. Microstructure and composition of the composites were analyzed by means of XRD, and mechanical and magnetic Properties of the composites were examined by using CSS--3901D electron creep relaxation tester and the magnetomechanical coupling testing machine, and the influence of environmental temperature and silica content and heat treatment on microstructure and the visco--elastic mechanical and magnetic properties were investigated in this paper. Experimental results show that mechanics properties of the composite were improved by adding silica, and the annealing of amorphous powder had no obvious influence on mechanics properties of the composite. The area of the hysteresis loop and coercivity could be decreased and the magnetic induction of the composite enhanced after annealing. It indicating that the annealing is benefit to improve nanocrystallization of the amorphous soft magnetic alloy Fe73.5Cu1Nb3Si13.5B9, and obviously increases the soft magnetic properties of composite. The results had specified direct significances for development, designation of new type higher sensitivity sensor.