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Interfacial Fracture Toughness of a Plasma Sprayed Hydroxyapatite Coating Used for Orthopedic Implants

Published online by Cambridge University Press:  15 February 2011

Y. Sugimura  and
M. Spector
Y. Sugimura
Affiliation:
Division of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, sugimura@esag.harvard.edu
M. Spector
Affiliation:
Department of Orthopedic Surgery, Brigham and Women's Hospital, Boston, MA 02115
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Abstract

This study introduces a new method for evaluating the adhesion strength of a coating on a substrate. The interfacial fracture toughness, Γi is used to assess the work per unit area required to separate an interface. Γi is measured for the as-received specimens of hydroxyapatite plasma sprayed on Ti-6A1-4V substrate. Calculation of the interfacial fracture toughness requires that the elastic modulus of the coating to be known. The Young's modulus of the plasma sprayed hydroxyapatite is assessed using a bend test. The effect of aqueous environment on the interfacial fracture toughness is also investigated.

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