Abstract
Four coating schemes and two substrate materials were designed to evaluate the characteristics of the ceramic/metal gradient thermal barrier coating.The gradient coating was well prepared by the plasma spray with the single torch and the single feeder.The coating performance was evaluated by observing microstructure,measuring thermal shock resistance and thermal residual stress.The coating microstructure was observed by scanning electron microscope(SEM).Diffractive peaks for the gradient coating were got at different zones by X-ray spectroscopy(XRS).The thermal shock experiment shows that the thermal shock resistance property of the gradient coating is better than that of the non-gradient coating.The measurements of thermal residual stresses in different coating schemes were carried out by the hole-drilling method;the results show that the compressional stress appears on 1Cr18Ni9Ti substrate and the tensile stress presents on 2Cr13 substrate.
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