Mechanical behaviour of brushite and hydroxyapatite coatings electrodeposited on newly developed FeMnSiPd alloys
Fornell Beringues, Jordina (Universitat Autònoma de Barcelona. Departament de Física)
Feng, Yuping (Universitat Autònoma de Barcelona. Departament de Física)
Pellicer Vilà, Eva Maria (Universitat Autònoma de Barcelona. Departament de Física)
Baró, M. D.. (Universitat Autònoma de Barcelona. Departament de Física)
Suriñach, Santiago (Suriñach Cornet) (Universitat Autònoma de Barcelona. Departament de Física)
Sort Viñas, Jordi (Universitat Autònoma de Barcelona. Departament de Física)

Data:	2017
Resum:	Calcium phosphate coatings (CaP) (i. e. , brushite and hydroxyapatite) were grown by pulsed current electrodeposition on FeMnSiPd alloys, a newly developed material proposed for biomedical implants. The electrolytic baths contained Ca(NO₃)₂·4H₂O and NH₄H₂PO₄ as precursors. Bath additives, such as H₂O₂ and NaOH, were used to promote hydroxyapatite (HAp) coating formation directly from the bath. The effect of the electrodeposition parameters on the structure, morphology and mechanical performance of the coatings was investigated. Increasing the electrodeposition time from 900s to 3600s resulted in an increase of HAp over the dominant brushite structure. Addition of 2000 ppm of NaOH or 3000 ppm of H₂O₂ also promoted an increase of HAp fraction when compared to the coatings obtained from the additive-free bath. Nonetheless, pure HAp was only achieved with the addition of 4000 ppm of NaOH to the electrolyte. The morphologies of the CaP particles in the coatings ranged from needle- to plate-like structures depending on the electrodeposition parameters and the resulting phases. The mechanical behaviour of the coatings was studied by scratch testing and nanoindentation. As a general trend, the Young's modulus and hardness values of the electrodeposited coatings were lower than those reported for fully-dense HAp, independently of the deposition conditions, because of the porous morphology of the coatings. No signs of cracking or delamination were observed during nanoindentation or scratch tests except for the coating prepared form the electrolyte containing 3000 ppm of H₂O₂.
Ajuts:	Ministerio de Economía y Competitividad IJCI-2015-27030 Ministerio de Economía y Competitividad MAT2014-57960-C3-1-R Ministerio de Economía y Competitividad RYC-2012-10839 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-1015
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Publicat a:	Journal of alloys and compounds, Vol. 729 (Dec. 2017) , p. 231-239, ISSN 0925-8388

DOI: 10.1016/j.jallcom.2017.09.187

Postprint 28 p, 2.1 MB

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Documents de recerca > Documents dels grups de recerca de la UAB > Centres i grups de recerca (producció científica) > Ciències > Grup de nanoenginyeria de materials, nanomagnetisme i nanomecànica (Gnm3)
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