Yang Siyuan, Wang Fei, Zhang Zhe, Liu Zhiming, Zhang Jiliang, Jiang Kaiyong
Fujian Key Laboratory of Special Energy Manufacturing, Huaqiao University, Xiamen 361021, China.
Xiamen Key Laboratory of Digital Vision Measurement, Huaqiao University, Xiamen 361021, China.
Materials (Basel). 2023 Jun 15;16(12):4397. doi: 10.3390/ma16124397.
Electromagnetic (EM) wave absorption performance is greatly affected by the microscopic morphology of the absorbing material particles. In this study, a facile and efficient ball-milling method was applied to increase the aspect ratio of particles and prepare flaky carbonyl iron powders (F-CIPs), one of the most readily commercially available absorbing materials. The effect of ball-milling time and rotation speed on the absorption behaviors of the F-CIPs was investigated. The microstructures and compositions of the F-CIPs were determined using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The EM parameters were measured using a vector network analyzer (VNA) in the frequency range of 2-18 GHz. The results indicated that the ball-milled flaky CIPs exhibited a better absorption ability than the raw spherical CIPs. Among all the samples, the sample milled at 200 r/min for 12 h and the sample milled at 300 r/min for 8 h showed remarkable EM parameters. The ball-milling sample with 50 wt.% F-CIPs had a minimum reflection loss peak of -14.04 dB at a thickness of 2 mm and a maximum bandwidth (RL < -7 dB) of 8.43 GHz at a thickness of 2.5 mm, a result that conformed with the transmission line theory. Hence, the ball-milled flaky CIPs were considered to be beneficial for microwave absorption.
电磁波吸收性能受吸收材料颗粒微观形态的影响很大。本研究采用一种简便高效的球磨方法来提高颗粒的长径比，并制备片状羰基铁粉（F-CIPs），这是一种最容易获得的商业吸收材料之一。研究了球磨时间和转速对F-CIPs吸收行为的影响。利用扫描电子显微镜（SEM）和X射线衍射（XRD）确定了F-CIPs的微观结构和成分。在2-18 GHz频率范围内使用矢量网络分析仪（VNA）测量电磁参数。结果表明，球磨后的片状CIPs比原始球形CIPs表现出更好的吸收能力。在所有样品中，以200 r/min球磨12 h的样品和以300 r/min球磨8 h的样品表现出显著的电磁参数。含50 wt.% F-CIPs的球磨样品在厚度为2 mm时具有-14.04 dB的最小反射损耗峰值，在厚度为2.5 mm时具有8.43 GHz的最大带宽（RL < -7 dB），该结果符合传输线理论。因此，球磨后的片状CIPs被认为有利于微波吸收。
