Acoustic emission analysis of thermal sprayed hydroxyapatite coatings examined under four point bend loading

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Abstract
Acoustic emission (AE) has been used to analyse hydroxyapatite (HA) coatings on Ti substrates subjected to four point bend testing. The coatings were produced using air plasma spraying, vacuum plasma spraying, or a continuous detonation system. Quantitative comparison of the AE results was made possible by the use of a D parameter, the value of which gives an indication of the relative AE count rate for a particular coating. Results showed that a high positive D parameter was associated with both thicker coatings and those coatings found to have the highest residual stresses. Optical and scanning electron microscopy observations of crack formation and distribution in the coatings correlate with the AE results indicating that the D parameter may be used to predict the performance of an HA coating subjected to high loading.

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