Electroless Metal Plating of Cenosphere and Its Electromagnetic Shielding Properties

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.