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Effect of the deposition route on the microstructure of plasma-sprayed hydroxyapatite coatings

Chambard, Marine and Marsan, Olivier and Charvillat, Cédric and Grossin, David and Fort, P. and Rey, Christian and Gitzhofer, François and Bertrand, Ghislaine Effect of the deposition route on the microstructure of plasma-sprayed hydroxyapatite coatings. (2019) Surface and Coatings Technology, 371. 68-77. ISSN 0257-8972

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Official URL: https://doi.org/10.1016/j.surfcoat.2019.01.027

Abstract

Plasma-spray (PS) is the most common technique used to cover orthopaedic titanium-based implant surfaces with hydroxyapatite (HA - Ca10(PO4)6OH2). The objective of the current work was to explore the influence of the precursor nature and characteristics (mainly powder size, Ca/P ratio, and density) on the morphology and the microstructure of HA coatings, deposited either by conventional atmospheric plasma spray (APS) or by rf-suspension plasma spray (rf-SPS). Two powders with different size distribution, density and shape were sprayed with same operating APS conditions. In parallel two water-based suspensions with distinct particle size and chemistry (Ca/P ratio) were implemented in rf-SPS. The morphology of both APS and rf-SPS coatings observed by SEM exhibits micro and sub-micro sized structures respectively, with similar porosity and thickness. The difference in precursor particle size does not affect the coating structure in rf-SPS, unlike in APS conditions. Superimposition of topography and phases maps performed from profilometry and Raman cartographies showed no direct correlation between the surface profile and composition. But such analysis highlighted the heterogeneity of the phases composing the coating surface, opening the possibility of a better understanding of biological behaviour.

Item Type:Article
HAL Id:hal-02498605
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Projection Plasma Système - 2PS (FRANCE)
Other partners > Université de Sherbrooke (CANADA)
Laboratory name:
Funders:
Agence Nationale de la Recherche - ANR - Région Occitanie
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Deposited On:04 Mar 2020 14:40

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