Hardness Evaluation of Porous Hydroxyapatite Coating
TypeCommunications avec actes
The extensive use of appropriate coatings to improve wear resistance, friction coefficient, electrical properties, corrosion resistance and biomedical application has stimulated a growing interest in their mechanical properties and especially hardness testing that is routinely used for coating evaluation. In this study Jönsson and Hogmark model is applied for the porous hydroxyapatite produced by plasma spraying on Ti6A14V substrate. Firstly, the effect of indentation load on hardness values of coating and substrate are studied. The modified Jönsson and Hogmark model is used to explain the composite hardness behavior and the effect of coating porosity.
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BEHNAMGHADER, Aliasghar; NAJJAR, Denis; IOST, Alain (societe française de métallurgie et de matériaux, 2006)L’objectif de cette étude est de caractériser le comportement fragile de l’hydroxyapatite (HAP) par évaluation de sa ténacité. Cette ténacité a été estimée pour des d’échantillons sous forme massive et pour des revêtements ...
Bone Tissue Response to Plasma Sprayed Hydroxyapatite Coatings: An In Vivo Study on Rabbit Femoral Condyles BEHNAMGHADER, Aliasghar; SHARIFI, Davood; SOROORI, Sarang; BAGHERI, Narjes; TOULOUEI, Ranna; NEMATI, Roghieh; NAJJAR, Denis; IOST, Alain (Iranian Association of Pharmaceutical Scientists, 2008)In this study, hydroxyapatite was coated on titanium substrates by plasma spraying process. A well-known porous and lamellar microstructure was found in the lateral and outer surface of coating. The phase composition was ...
BEHNAMGHADER, Aliasghar; SHIRAZI, Reyhaneh Neghabat; IOST, Alain; NAJJAR, Denis (Trans Tech Publications, Switzerland, 2011)Surface degradation and cracking of dense hydroxyapatite were evaluated through Vickers micro indentation using indentation loads ranged from 25 gf to 2000 gf. Crack lengths, imprint diameters and the number of ...
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VAN GORP, Adrien; BIGERELLE, Maxence; GRELLIER, Alain; IOST, Alain; NAJJAR, Denis (ELSEVIER, 2007)This paper proposes a new multi-scale measurement approach performed to compare the surface roughness and the visual aspect of polished surfaces. In this investigation, five specimens of glass moulds presenting different ...