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针对传统低频电天线存在的体积庞大与高功耗问题，基于压电谐振原理的磁电（ magnetoelectric，ME）天线展现出显著的优势。然而，磁电复合材料中的粘接层与压电相、铁磁相之间的声学阻抗失配现象，严重阻碍了磁-机-电耦合过程中的应力传递效率，进而限制了磁电复合材料的磁辐射强度。为提升磁发射性能，本文设计了一种高界面应力传递特性的磁电复合材料，其具有类三明治的结构，由Pb（ Zr,Ti） O3压电纤维复合材料（ macro fiber composite，MFC）压电层、均匀填充MoS2的环氧树脂粘接层，以及FeBSi（ Metglas）磁致伸缩层组成。通过向粘接层引入二维填料MoS2，有效改善了粘接层与铁电相、铁磁相之间的声阻抗匹配特性。系统研究了MoS2填充量对PZT MFC/Metglas磁电复合材料磁发射强度的影响规律。实验结果表明，当MoS2填充量为1 wt%时，该复合材料在最佳偏置磁场条件下的磁发射强度达到了331 µT，相较于未填充MoS2的磁电复合材料提升了1.5倍；在距离发射源1 m处，磁发射强度可达2.7 nT。结合声阻抗匹配理论，深入探讨了电-机-磁耦合过程中的应力传递机制。此外，通过采用幅移键控（ amplitude shift keying，ASK）调制技术，验证了基于MoS2改性的PZT MFC/Metglas磁电复合材料在信号无损传输方面的有效性。本研究提出的粘接层优化方法，为通过增强应力传递效率提升磁电响应性能提供了一种简便高效的技术途径，同时为低频水下通信、地下传感以及分布式无线网络等小型通信系统的发展提供了新的技术方案与理论支撑。
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关键词:
- PZT MFC/Metglas磁电复合材料 /
- 磁发射强度 /
- 应力传递 /
- 声阻
The magnetoelectric (ME) antenna based on the piezoelectric resonance principle can address the problems of large size and high power consumption of traditional low-frequency electrical antennas. However, the acoustic impedance mismatch between the adhesive layer in the magnetoelectric composite and the piezoelectric and ferromagnetic phases significantly hinders the stress transfer during the magneto-mechanicalelectric coupling process, ultimately limiting the magnetic radiation intensity of the magnetoelectric composite. To enhance the magnetic emission performance of the PZT MFC/Metglas magnetoelectric composite, this paper selects the two-dimensional filler MoS2 to fill and modify the adhesive layer of the PZT MFC/Metglas magnetoelectric composite, aiming to increase the acoustic impedance matching between the adhesive layer and the ferroelectric and ferromagnetic phases. The influence of the MoS2 content on the magnetic emission intensity of the PZT MFC/Metglas magnetoelectric composite has been systematically studied. The results show that when the filling content of MoS2 is 1 wt%, the magnetic emission intensity of the PZT MFC/Metglas magnetoelectric composite can reach 331 µT under the optimal bias, which is 1.5 times higher than that of the magnetoelectric composite without MoS2 filling. At a distance of 1 m, the magnetic emission intensity can reach 2.7 nT. Combined with the acoustic impedance matching theory, the stress wave transfer mechanism in the electro-mechanical-magnetic coupling has been discussed. In addition, through the amplitude shift keying (ASK) modulation method, the lossless signal transmission capability of the magnetoelectric antenna made of the MoS2-modified PZT MFC/Metglas magnetoelectric composite has been demonstrated. This method of optimizing the interfacial adhesive layer presents a simple and effective approach to expand the magnetoelectric response by increasing the stress wave transfer efficiency. Meanwhile, it provides a feasible solution for communication systems such as low-frequency underwater communication, underground sensing, and distributed wireless networks.-
Keywords:
- PZT MFC/Metglas magnetoelectric composite /
- Magnetic emission intensity /
- Stress transfer /
- Acoustic impedance
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