Complementary Methods for Evaluation of Yttria Stabilized Zirconia Coatings used as Thermal Barrier Coating

The paper proposes the use of a nondestructive electromagnetic (NDE) method for evaluation of zirconia coating on AISI 316L, based an electromagnetic (EM) sensor with metamaterial lens.Metamaterials (MM), namely conical Swiss roll (CSR), operated in radiofrequency range can serve as EM flux concentrators.EM lens composing the sensors are designed on the basis of Fourier optic principles and allows the enhancement of the spatial resolution of method in order to evaluate quality of surface /adhesion coating-support.Complementary methods such as scanning electron microscopy (SEM), X ray diffraction (XRD) and neutron diffraction (ND) are employed for the studies of the samples taken into consideration.