Abstract
The effect of the bond-coating on the adhesion strength after the thermal fatigue test was investigated in the air plasma sprayed thermal barrier coatings (APSed TBCs). In this work, two kinds of the CoNiCrAlY powder with the different particle size were used for spraying the bond coating material. In addition, the bond coat was sprayed by either the low-pressure plasma spray (LPPS) method or the high velocity oxy-fuel (HVOF) one. The adhesion strength and the residual stress were evaluated as a function of the thermal fatigue cycles. The experimental results indicated that the adhesion strength after thermal cycle fatigue was varied with the bond-coating. The effects of the residual stress and the thermal fatigue damage, i.e., micro-cracks, on the adhesion strength were discussed.
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