Measurement of residual stress in plasma-sprayed composite coatings with graded and uniform compositions

摘要

Residual stresses in plasma sprayed composite coatings were studied experimentally by both curvature and neutron diffraction measurements. Graded and uniform composite coatings, consisting of nickel + alumian and NiCrAlY + yttria-stabilized zirconia, were investigated. This paper briefly summrizes our recent work dealing with the effects of coating thickness, composition, and material properties on the evolution of residual stresses in coatings. Analysis of the results allowed in some cases the separation of the quenching stress and thermal stress contributions to the final residual stress, as well as the determination of the through-thickness strss profile from measurements of different thickness speciemens.