Evaluation of Zirconia Coatings Deposited on Stainless Steel Substrate

摘要

Thermal barrier coating (TBC) is used as thermal protective layer dedicated to metallic components in high temperature region, on engines and gas turbines, leading to high component reliability and operating temperature, resulting in higher efficiency and better environmental benefits. Zirconia doped with Yttria ceramics are considered a good TBC material due of its low thermal conductivity, refractory, chemical inertness, and compatible thermal expansion coefficient with metallic support. The paper proposes the use of an electromagnetic method for evaluation of zirconia coating on some stainless steels using a sensor with metamaterial lens and comparison of the results with those obtained by complementary methods.