A method for the increase of the voltage - and insulation strength of ferrite magnet, and use of this method for the manufacture of a protective gas relay

摘要

The barium ferrite is coated with Cu to 1-5 micron thick, this layer then being oxidised at 600-900 degrees C in a N2/O2 atmos., finally a glassy layer being sprayed on and fired at 500-1000 degrees C.