树脂基稀土-铁系超磁致伸缩复合材料的制备与压应力效应研究

Preparation and Compressive Stress Effect of Polymer Matrix RE-Fe Giant Magnetostrictive Composite

采用粉末粘结-磁场成型法制备了树脂基稀土-铁系超磁致伸缩复合材料(Giant magnetostrictive particle composite, GMPC), 并对样品在不同压应力下的磁致伸缩系数进行了测量, 当样品中的TeDyFe合金颗粒尺寸为0～200 μm、质量分数为90%时, 其磁致伸缩系数于外加磁场达到266 kA·m-1时即已趋近饱和, 饱和磁致伸缩系数达623×10-6;当施加在样品纵向方向上的预压应力为5 Mpa时, 此时样品的饱和磁致伸缩系数最高, 为662×10-6, 比未加预压应力时样品的饱和磁致伸缩系数高39×10-6, 表明所制得的实验样品具有一定的压应力效应, 并且压应力效应在较低压力下起积极作用, 在较大压力下则产生消极作用.

Abstract： Polymer matrix RE-Fe giant magnetostrictire composite （GMPC） was prepared using bonding and magnetic field forming technique, and magnetostriction of samples was measured for different compressive stress. The experimental results show lhat there is certain compressive effect in GMPC. And the influence of compressive stress on magnetostriction of sample was investigated. It offers essential reference for application and device design of GMPC.