Type

Journal Article

Authors

Graham L W Cross
Michael A Morris
Sonia Ramirez-Garcia
John Power
Johann P de Silva
Colm McManamon

Subjects

Engineering

Topics
behavior biomedical devices determination mechanical properties ti 6al 4v cross section hydroxyapatite plasma

Interfacial characteristics and determination of cohesive and adhesive strength of plasma-coated hydroxyapatite via nanoindentation and microscratch techniques. (2014)

Abstract We investigate the chemical composition and mechanical properties of plasma-deposited hydroxyapatite on grit-blasted Ti-6Al-4V coupons as models of typical prosthetic hip implants. Nanoindentation is used to extract the mechanical properties of the hydroxyapatite (HA) coating and to evaluate the behavior of the material as a function of distance from the interface. A microscratch technique was used to determine parameters of cohesive and adhesive failure of the material that are critical in determining the functionality of these biomedical devices. This delamination method has not been studied in detail before and is usually considered to be unsuitable because of the thickness of the HA and the roughness of the substrate. However, through cross-section analysis of the scratch test, we can determine the point at which the HA delaminates from the substrate. It was concluded that spallation occurs locally, and there is no evidence of gross spallation, indicating that the coating is well adhered to the substrate.
Collections Ireland -> Trinity College Dublin -> PubMed

Full list of authors on original publication

Graham L W Cross, Michael A Morris, Sonia Ramirez-Garcia, John Power, Johann P de Silva, Colm McManamon

Experts in our system

1
Michael A. Morris
University College Cork
Total Publications: 164