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RESIDUAL STRESS STATE OF HYDROXYAPATITE GRADED COATING ON CERAMIC SUBSTRATE

Hydroxyapatite (HA)/Bioactive glass (BG) compound coatings are deposited on nanometer ZrO2 toughened Al2O3 ceramic (ZTA) substrates using slurry-dipping and sintering method. The present study aims to identify the residual stress distribution behavior in the coating by X-ray diffraction technique and to correlate it to the graded interlayer structure. Residual stress measurement results show the graded compound interlayer structure can mitigate the “thermal stresses” that induced by the difference in coefficient of thermal expansion between the top HA layer and the substrate material effectively. In addition, it is proved that almost no “intrinsic stresses” are induced in the slurry-dipping and sintering process.