空心玻璃微球镍镀层的制备及其电磁性能

Fabrication of Ni Coatings on Glass Microspheres and Electromagnetic Properties

采用化学镀技术在低密度玻璃微球表面沉积了一层Ni镀层，制备了具有导电性和磁性的Ni镀层／玻璃微球壳一核复合粉体。采用X射线衍射仪（XRD）、扫描电镜（SEM）和能谱仪（EDS）对化学镀前后玻璃微球的结构、表面形貌以及成分进行了分析。结果表明，化学镀后玻璃微球表面包覆了一层均匀致密的Ni薄膜，厚度约为0．2μm，镍具有面心立方结构。使用波导法在8～12GHz波段内对化学镀前后的微球进行了介电常数和磁导率测试。电磁性能研究表明，玻璃微球化学镀镍后电磁损耗增大，显示出作为电磁波吸收材料的应用前景。

Ni/glass microspheres composite powders with conductive and magnetic properties were fab- ricated successfully by electroless plating of Ni alloy thin coatings on glass microspheres. X-ray diffraction （XRD）, scanning electron microscopy （SEM） and energy disperse spectrometry （EDS） were used to characterize the crystalloid structure, topography and component of non-coated and coated glass microspheres. It is shown that a uniform Ni coating with the thickness at about 0.2μm is coated on glass microspheres after electroless plating. The Ni coating has face-centered cubic structure. The permittivity and permeability of non-coated and coated glass microspheres were tested by the waveguide method in 8-12GHz. It is concluded that electromagnetic loss properties of the coated glass microspheres have been greatly improved.