Abstract
Abstract The aim of this paper was to obtain the regression equation of the bonding strength of sprayed coatings vs. acoustic emission (AE) signal. FeCrBSi coating, Al2O3-40 wt.% TiO2 (AT40) coating and Al2O3 coating were prepared using an atmospheric plasma spraying system. The microstructures and properties of the coatings were characterized. The coatings exhibited typical laminate structure with low porosity and good bonding interface. The AE signals during indentation testing were abstracted and investigated. AE energy was more sensitive to the coating cracking failure than AE amplitude. Moreover, the energy of AE burst signal had a close positive relationship with coating bonding strength. The distribution characteristic of AE peak energy was discussed based on the Weibull distribution. The best regression equations for the three coatings were obtained to predict the bonding strengths of sprayed coatings based on AE burst signal energy for similar coating/substrate systems.
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