Electromagnetic absorber granulate used in production of shielding devices consists of highly porous glass and/or ceramic granulate coated or filled with ferrite and/or electrically conducting material

摘要

Electromagnetic absorber granulate consists of a highly porous glass and/or ceramic granulate coated or filled with ferrite and/or an electrically conducting material. An Independent claim is also included for a process for the production of a coated absorber granulate comprising finely grinding the ferrite and/or electrically conducting material, and applying with a binder as suspension to the glass and/or ceramic granulate. Preferred Features: The electrically conducting material is a metal and/or carbon. The granulate grain size is 0.2-5 mm and the coating has a thickness of 10-300 mu m. The ferrite is made of an Mn-Zn, Ni-Zn, Ba, Sr ferrite or a Sc-, Co-, or Ti-substituted hexaferrite with a garnet structure.