Synthesis of Compound Ceramic with Shell-core Structure and Its Electromagnetic Characters

In order to improve the microwave absorption of the absorber, the compound particles of barium titanate coated with carbon black were synthesized by a sol-gel method. The microstructure and morphology of the compound powders were characterized, and dielectric properties and microwave absorption property of the composite were investigated. XRD and TEM results show that carbon black nano-films are well coated on the surfaces of barium titanate particles. The barium titanate particles are spherical, loosely agglomerate with sizes in the range of 50-70nm, and the coated film is 10-20nm thick. The dielectric and microwave absorption properties of the compound particle are improved. The results indicate that compound particles have different effects on the microwave absorption performance of the composites with different compound particle contents. When the weight content of compound particles filling to epoxide resin matrix exceeds 20wt%, the microwave absorption performance of the composite with the compound particles and epoxide resin can be improved greatly.