Evaluation of adhesion strength of sol-gel ceramic insulation for HTS magnets

Adhesion strength of high temperature insulation materials deposited on sil ver was investigated, CeO2 and ZrO2 based coatings on Ag substrates were pr epared by the sol-gel technique. Experiments for determining the adhesion s trength between insulations and silver were performed using a mini tensile testing machine. The microstructures of coatings and their interfaces were determined by means of SEM, EDS, and X-ray diffraction. The results indicat ed that the failure was in the form of a mixed type as interfacial/cohesive defect. The average adhesive strength of ZrO2, CeO2, ZrO2+20wt% MgO, ZrO28wt% Y2O3, ZrO2 + 8wt% CeO2, ZrO2+15wt% In2O3 and ZrO2+15wt% SnO2 were foun d to be 0.763, 0.913, 1.045, 1.150, 0.915 0.833 and 0.797 MPa, respectively . Y2O3, MgO, and CeO2 doped ZrO2 showed the best adhesive properties.