Abstract
Techniques for measuring the residual stresses in bilayer thermal barrier coatings of a NiCrAlY alloy metal sublayer and 8-wt% stabilized ZrO2–8Y2O3 ceramic upper layer are developed with the inhomogeneous composition and stress relaxation upon removal of the top layers taken into account. The outer ceramic layer is shown to undergo quenching-induced tensile stress up to 200 MPa, whereas the metal sublayer is subjected to compressive stress of 600 MPa which is associated with an increase in the specific volume as a result of the formation of a thermally grown oxide (TGO).
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Original Russian Text © S.Y. Betsofen, A.A. Ashmarin, A.A. Lozovan, B.V. Ryabenko, A.N. Lutsenko, A.M. Mamonov, D.E. Molostov, 2016, published in Poverkhnost’, 2016, No. 7, pp. 33–40.
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Betsofen, S.Y., Ashmarin, A.A., Lozovan, A.A. et al. Specific features of residual stress measurements in thermal barrier coatings. J. Surf. Investig. 10, 705–711 (2016). https://doi.org/10.1134/S1027451016040054
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DOI: https://doi.org/10.1134/S1027451016040054