Effect of heat treatments with air atmosphere in the performance in vitro and adherence of oxy-fuel thermal sprayed hydroxyapatite coatings
DOI:
https://doi.org/10.17533/udea.rcm.327998Keywords:
coating, oxy-fuel thermal spraying, heat treatment, hydroxyapatite, in vitro test, oxyapatiteAbstract
This paper shows the influence generated by heat treatments in air on properties of hydroxyapatite coatings, deposited by oxy-fuel thermal on substrates metallic Ti6 Al4 V. Were conducted heat treatments in air to 600°C for 1 hour and to 800°C for 1 and 3 hours. Assessed microstructure, crystalline phases present, microhardness of substrates and coatings, adhesion of coatings and stability of coating with best properties in physiological fluids simulated. The coatings show morphologies with typical ways of coatings made by heat projection with flame oxyacetylene. The spectra of x-ray diffraction (XRD) showed the presence of crystalline phases corresponding to hydroxyapatite, as well as the presence of oxiapatita; secondary phase absent after the heat treatments made, increasing the crystallinity of hydroxyapatite. After heat treatment there was aslight decrease of hardness of the substrates. The treatment best balance of properties presented was the realized to 800°C for 3 hours, throwing adhesion values of 13,37 ± 0,21 MPa. The in vitro tests carried out showed the dissolution of phases secondary in coatings from the precipitation of crystals of calcium on the surface of the ceramic coating, precipitates were observed with better detail with images taken with scanning electron microscopy and these were rising as it increased the days of immersion in the simulated physiological fluid.
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