In light of high bonding and early strengths, magnesium phosphate cement (MPC) functionalized with nano-Fe₃O₄ magnetic fluid and hollow glass microspheres (HGM) that exhibited excellent electromagnetic wave absorption performance (EWAP) was fabricated in this study. Coating a construction surface with multifunctional MPC could effectively withstand electromagnetic radiation hazards. Effects of the Fe₃O₄-like ferrite content and type (i.e., nano-Fe₃O₄ magnetic fluid, nano-Fe₃O₄ particles and magnetite), and the surface roughness of specimens on the EWAP of the MPC were investigated by lab tests. Test results showed that the Fe₃O₄-like ferrite greatly improved the EWAP of the MPC and the enhancement effectiveness was in descending order of nano-Fe₃O₄ magnetic fluid > nano-Fe₃O₄ particles > magnetite. Among the samples tested in this study, MPC blended with 5 wt% nano-Fe₃O₄ magnetic fluid showed an optimal EWAP as indicated by a peak reflection loss of −11.2 dB and bandwidth of 9.67 GHz below −10 dB. Additionally, the reflection loss of the MPC in the high frequency range could be further improved by carving notches on the surface to increase the number of microwave reflections. The electromagnetic energy absorbing mechanism and the hydration progress of the MPC were further analyzed with SEM/EDS and XRD results. The hydration degree of the MPC got improved due to the lubricating effect of HGM and filling effect of nano-Fe₃O₄ magnetic fluid, which also optimized its micro structure and compressive and flexural strengths. From this study, the nano-Fe₃O₄ magnetic fluid and HGM modified MPC had potential application in the construction of buildings for enhanced resistance to electromagnetic radiation.

鉴于高粘结性和早期强度，本研究制备了具有纳米Fe ₃ O ₄磁性流体和中空玻璃微球（HGM）功能化的磷酸镁水泥（MPC ），该微球具有出色的电磁波吸收性能（EWAP）。用多功能MPC覆盖建筑表面可以有效抵抗电磁辐射危害。研究了类似Fe ₃ O ₄的铁素体含量和类型（即纳米Fe ₃ O ₄磁性流体，纳米Fe ₃ O ₄颗粒和磁铁矿）以及试样表面粗糙度对MPC EWAP的影响。通过实验室测试。测试结果表明，铁₃ O ₄样铁氧体极大地改善了MPC的EWAP，增强效果按纳米Fe ₃ O ₄磁性流体>纳米Fe ₃ O ₄颗粒>磁铁矿的降序排列。在本研究测试的样品中，MPC与5 wt％的纳米Fe ₃ O _4混合磁流体显示出最佳的EWAP，如-11.2 dB的峰值反射损耗和低于-10 dB的9.67 GHz带宽所示。另外，通过在表面刻一些刻痕以增加微波反射的次数，可以进一步改善MPC在高频范围内的反射损耗。用SEM / EDS和XRD结果进一步分析了MPC的电磁能吸收机理和水合过程。MPC的水合度由于HGM的润滑作用和纳米Fe ₃ O ₄磁性流体的填充作用而得到改善，从而优化了其微观结构以及抗压和抗弯强度。根据这项研究，纳米Fe ₃ O ₄ 磁流体和HGM修饰的MPC在建筑物的建筑中具有潜在的应用，可以增强对电磁辐射的抵抗力。