Out-of-pile characterization of Al2O3 coating as electrical insulator

Al2O3 is one of most promising materials as electrical insulator from a point of high electrical resistivity, etc. In this study, Al2O3 coating as electrical insulator was fabricated by the plasma spraying and its properties without neutron irradiation were investigated. For Al2O3 coating on SS316LN-IG, SS410 by vacuum plasma spraying and 80Ni–20Cr by atmospheric plasma spraying were selected as the undercoating between the ceramic and the metallic substrate. Thermal shock test, electrical resistivity measurement, adhesion test and mechanical impact test were carried out. From the results of this characterization, it was clear that the specimen on which Al2O3 is coated on SS316LN-IG substrate with SS410 undercoating has good thermal shock resistivity.