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Mechanical properties of suspension plasma sprayed hydroxyapatite coatings submitted to simulated body fluid

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2010
auteur(s) Latka Leszek; Pawlowski Lech; Chicot Didier; Pierlot Christel; Petit Fabrice
journal (abréviation) Surface and Coatings Technology (Surf Coating Tech)
volume (numéro) 205 (4)
  
pages 954 – 960
résumé Home synthesized (HA) powder was formulated with water and alcohol to obtain a suspension used to plasma spray coatings onto titanium substrate. The deposition process was optimized and the resulting coatings were soaked in simulated body fluid (SBF) for the periods of 3, 7, 14, 28, and 60 days at controlled temperature of 37 °C. The microstructural research enabled to find in the as-sprayed deposits two characteristic zones: (i) dense zone corresponding to the lamellas, observed usually in thermally sprayed coatings; (ii) sintered zone containing fine hydroxyapatite grains corresponding to the fine solids from initial suspension. The sintered zone disappears after soaking in SBF and the pores get filled by the reprecipitated calcium phosphates. The adhesion of the soaked coatings to the substrate was characterized by the critical load in the scratch test and was about 10 to 12 N. The Young modules of the coatings were determined with help of depth-sensing indentation test by the use of the technique developed by Oliver and Pharr. The modules were not depending on the time of soaking and their mean values were 15.6 and 28.4 GPa, depending on the coating operational parameters. The scratch test enables to determine the hardness of the coatings, which remained fairly constant during the time of soaking in the range of 3 to 5 GPa. This hardness was compared to that the Martens microhardness which doubled with time of soaking to reach up to 1 GPa.
mots clés Suspension plasma spraying; Hydroxyapatite; Simulated body fluid; Elastic modulus; Indentation test; Scratch test
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