ELECTRICAL PROPERTIES OF MgO-ZrO2 INSULATING COATINGS ON DIFFERENT TYPES OF EPOXIES

The insulating coating of MgO-ZrO2 was coated on Stainless-Steel-304 (SS) tapes by reel-to-reel sol-gel process for investigation of electrical properties under various pressures at room temperature (298 K) and liquid nitrogen temperature (77 K) for HTS/LTS high field insert coil. Solutions were prepared by using Mg and Zr based precursors, solvent and chela-ting agent, then the insulation was made on long-length SS substrate. Insulation thickness for 4, 8, and 12 dippings was determined to be 7, 12, and 15 μm, respectively. Three different types of stycast, 2850 FT/24 LV Black and Blue, and White Buecher Epoxy Resin were stu-died. Stycast thicknesses were varied from 32-18 μm, when the pressure was applied from 0 to 0.54 GPa. The thicknesses of insulating coatings and stycast were measured by using Envi-ronmental Scanning Electron Microscope (ESEM). Resistance, capacitance and High Voltage Breakdown (HVbd) of the samples were measured by using standard equipment. Then, dielec-tric constant and electric strength were calculated. An analytical model was modified by the experimental data. The results were presented graphically