Laser sealing and thermal shock resistance of 6.5 wt% yttria Partially stabilized zirconia plasma sprayed layers

Abstract

Laser sealing of zirconia-6.5 wt% yttria partially stabilized zirconia (YPSZ) plasmasprayed layers were examined for both plan views and transverse sections. Scanningelectron microscopy (SEM) has been used extensively to characterize the general featuresand microstructure of the layers under optimum laser processing conditions. The laser beamis shown to be effective in modified the plasma sprayed layers by sealing the porosity anddecrease the roughness. Thermal shock resistance test reveals that sealed layers have beenan excellent resistance to cracks formation parallel to the surface.