Electrical Properties of Sol‐Gel MgO ‐ ZrO2 Insulation Coatings under Compression for Magnet Technology

The high temperature compatible MgO ‐ ZrO2 insulation coatings were applied on Stainless‐Steel‐304 (SS) ribbons by sol‐gel process for magnet technologies. SS ribbons did not considerably oxidize, even though the coating process occurs in an oxidation atmosphere. Electrical properties of the samples such as high voltage breakdown (HVbd), electrical strength and dielectric constant under varying stress, at Room Temperature (RT) and 77 K were investigated. The measurements were carried out with and without epoxy impregnation. Surface morphologies of insulated samples were examined by using Environmental Scanning Electron Microscope (ESEM), after high voltage breakdown test.