【摘要】 以粉末粘结、模压成型方法,研制了0-3型的E-44环氧树脂基稀土-铁系超磁致伸缩复合材料。采用电阻应变片技术与Agilent 4294A型动态阻抗分析仪,研究了超磁致伸缩合金/环氧树脂复合材料的磁致伸缩性能及高频磁性能,并对所制备的磁致伸缩复合材料的磁导率、截止使用频率等随频率和树脂体积分数的变化规律进行了系统研究。结果表明:树脂的添加,不仅可以提高复合材料的截止频率和高频磁性能,使其具有良好的高频响应特性,其截止频率达30 MHz以上;而且通过适当选择树脂的体积分数,复合材料仍能保持良好的磁致伸缩性能,当树脂体积分数分别为20%、30%时,磁致伸缩系数分别达808×10-6、821×10-6,而当复合材料中树脂的体积分数为50%时,其磁致伸缩系数仍高达592×10-6。探讨了树脂/磁致伸缩复合材料的磁电耦合机制。更多还原

【Abstract】 Polymer-matrix Re-Fe giant magnetostrictive composites were prepared by combining 0-3 type magnetostrictive alloy(Tb0.3Dy0.7Fe1.95) and epoxy(E-44).The magnetostriction and high frequency magnetic properties of the composites were studied by using the standard strain gauge technique and Agilent 4294A impedance analyzer.The dependence of permeability,cut-off frequency properties on the frequency and the volume fraction of E-44 was investigated in detail.The results show that the composites have both good dynamic response with a high frequency and magnetostriction properties.The cut-off frequency of composites is higher than 30 MHz,and their magnetostriction is 808×10-6 and 821×10-6 when the volume fraction of E-44 is 20% and 30%.The magnetostriction of the composite still keeps to be 592×10-6 when the volume fraction of E-44 is 50%.The high frequency response mechanism of the magnetostrictive composite was analyzed.更多还原