采用化学镀工艺,在粒径为1～20 μm空心陶瓷微球表面包覆了一层金属Co.先以Sn-Pd溶液作为活化剂,将空心微球表面进行活化,再采用以次亚磷酸钠为还原剂的碱性镀液使其表面沉积上金属Co.使用X射线能谱仪(EDX)和场发射扫描电子显微镜(FESEM)对包覆结果进行表征,通过优化确定出最佳化学镀液配方.用网络矢量分析仪对包覆了Co的空心微球的电磁参数进行了测量.结果表明:经过化学镀的空心微球表面包覆了一层致密,均匀的金属镀层,得到的功能化空心微球在2～18 GHz的频率范围内具有较高的介电常数,具有一定的微波吸收性能.
Functional microspheres with size of 1-20 μm were produced by plating Co on hollow ceramic microspheres for the application of lightweight microwave absorbers. Using Sn-Pd solution as active agent, the surface of hollow microspheres was activated. Co plating was carried out in an alkaline bath with sodium hypophosphite as a reducing agent. The coating of Co was characterized by field-emission scanning electron microscopy (FESEM) and energy-dispersive X-ray spectroscopy (EDX). The electromagnetic properties were improved by adjusting the molar ratio of main salt to complexing agent and the concentration of the main salt in a certain range. Furthermore, the processing conditions such as pH value and plating temperature were optimized. Due to the conductive and ferromagnetic behavior of Co coating which is dense and uniform, high dielectric constant can be obtained in the microwave frequency range of 2-18 GHz and the functional hollow micorsphere has certain microwave absorption performance.
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