【摘要】 磁电复合材料在磁-电能量转换等领域具有重要的潜在应用价值,研究磁电复合材料在较高频率下的磁电耦合特性对于实际应用具有重要意义。本文中以0-3型的Terfenol-D(Tb0.30Dy0.70Fe2)/环氧树脂复合材料为磁致伸缩层,以PZT[Pb(Zr0.52Ti0.48)O3]压电陶瓷为压电层,制备了三明治结构的层合磁电复合材料。研究了Ter-fenol-D/环氧树脂复合材料层的磁致伸缩性质,并对所制备的层合磁电复合材料磁通密度、介电常数以及磁电电压系数等随频率和偏磁场的变化规律进行了系统研究。结果表明,由于Terfenol-D/环氧树脂复合材料的引入,层合磁电复合材料呈现出良好的频率响应特性,可靠工作范围大大拓宽。层合磁电复合材料具有优良的动态磁电耦合性能,在优化偏磁场630 Oe和共振频率69.6 kHz下的磁电效应高达21.2 V/cmOe。此外,层合磁电复合材料的磁电效应随偏磁场的变化发生明显变化,并存在优化偏磁场。对上述现象和结果进行了详细讨论,并给出了层合磁电复合材料的磁电耦合机制。更多还原

【Abstract】 The magnetoelectric composites have important and potential applications in magnetic-electric energy conversion.It is important to study the magnetoelectric coupling properties at high frequency for their applications.In this paper,magnetoelectric laminate composites were prepared by combining 0-3 type magnetostrictive Terfenol-D(Tb0.30Dy0.70Fe2)/epoxy composite and PZT [Pb(Zr0.52Ti0.48)O3] ceramic.The magnetostriction property of the Terfenol-D/epoxy composite was studied.The dependence of flux density,dielectric property and magnetoelectric effect on frequency and magnetic bias were investigated in detail.It is shown that the laminate composite possesses good dynamic magnetoelectric response with a wide frequency range.The magnetoelectric effect of the laminate composite varies evidently with magnetic bias and there exists an optimized magnetic bias.The magnetoelectric effect of the laminate composite achieves a maximum value of 21.2 V/cmOe at the optimized magnetic bias of 630 Oe and resonant frequency of 69.6 kHz.These results were discussed in detail and the magnetoelectric coupling mechanism of the composite laminate was analyzed.更多还原