空心微珠表面金属化及其电磁防护性能研究

Electroless Metal Plating of Cenosphere and Its Electromagnetic Shielding Properties

以无机非金属空心微珠为芯材用化学镀工艺进行了镀铜、镀镍、镀银等表面金属化实验,得到表面金属包覆完整的导电粉体,该粉体作为电磁防护涂料的导电填料具有密度小、导电性能良好的优点。分析了空心微珠表面金属化的化学反应,并通过扫描电镜观察空心微珠表面包覆金属层的情况,结合X射线衍射仪分析粉体Cu-Ag金属化后的表层成分,表明获得了银层包覆完整的产物。空心微珠表面Cu-Ag金属化后,制成电磁屏蔽涂料,其电磁屏蔽性能可达到-40dB;表面Ni金属化后,制成吸波涂料,可获得面密度小、吸波性能良好的吸波涂层。

With cenosphere as core the electroiess metal-plating experiments such as copperplating. nickelplating and silverplating, etc. have been done so that the conductive powder with perfect metal-coaling has been obtained. The powder, as the conductive filler of electromagnetic protective coatings, has the advantage of small density and good conductivity. The authors analyze the chemical reaction of cenosphere metal-plating, use the scanning electronic microscope to observe and study the metal-plated layer and use X-ray diffractometer to analyze the chemical compositions of copperplatcd and silverplatcd surface. The results show that a perfect coated product has been obtained. After cenosphere is Cu-Ag-plated and then made into shielding material, the electromagnetic shielding property can reach -40 dB; while cenosphere is Ni-plated and made into wave absorption coatings, the coatings have small density and fine performance of wave absorption.