Abstract
The residual stresses for different Ti + hydroxyapatite (HA) compositional gradient coatings on Ti6Al4V substrates were analysed by means of synchrotron radiation measurements. The samples were obtained by plasma spraying using different plasma spraying parameters for the different layers and coatings. A finite element model (FEM) was developed and a comparison between the theoretical FEM predictions and the experimental values was done. The influence of the plasma spraying parameters on the stresses was studied. The stress in a pure HA coating on Ti6Al4V substrate was measured and compared with those in the HA layers of the compositional gradient coatings.