Abstract
Protecting coatings as thermal barrier coating (TBC) are used for yield improvement of equipment working at high temperature. 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 coatings on stainless steel using a sensor with metamaterial lens and comparison of the results with those obtained by complementary methods.
Highlights
Protecting coatings as thermal barrier coating (TBC) are used for yield improvement of equipment working at high temperature
This paper proposes to present an electromagnetic method for evaluation of zirconia coating on stainless steel using an electromagnetic methods based on the sensor with metamaterial (MM) lenses that assure an enhancement of spatial resolution
Modification of crystallite type, size and shape was not possible to determine by microscopic techniques exactly, modification of crystallites will be further studied by JINR Dubna with use of techniques based on diffraction
Summary
Protecting coatings as thermal barrier coating (TBC) are used for yield improvement of equipment working at high temperature. The electromagnetic methods for nondestructive testing (NDT) at high frequencies in the MHz range allow the characterization of the thin coating adhesion and testing for the detecting possibility to appear the defects between the coating and support materials. Other well-known NDT methods for emphasizing flaws/fatigue or stress are acoustic emission for cracks detection in TBCs [2]; infrared thermography to examine the delamination of TBC’s [3]; piezo-spectroscopy measure stress levels and failure in TBCs by analysis of the shape of luminescence spectra [4]; impedance spectroscopy; electromagnetic methods, for characterization of the thin coating adhesion/presence of spallation; ultrasound methods, etc. Zirconia based ceramic components have excellent fracture toughness, very good wear resistance, high corrosion stability, low thermal conductivity and coefficient of thermal expansion in range of steel.
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