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Mechanical and Chemical Characterization of a Metal-Bioceramic Interface

Published online by Cambridge University Press:  22 February 2011

Mark J. Filiaggi ,
N. A. Coombs  and
R.M. Pilliar
Mark J. Filiaggi
Affiliation:
Centre for Biomaterials, University of Toronto, 124 Edward St., Toronto, Ont. M5G 1G6
N. A. Coombs
Affiliation:
Centre for Biomaterials, University of Toronto, 124 Edward St., Toronto, Ont. M5G 1G6
R.M. Pilliar
Affiliation:
Centre for Biomaterials, University of Toronto, 124 Edward St., Toronto, Ont. M5G 1G6
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Abstract

Plasma sprayed Hydroxyapatite (HA) coatings are applied to metal prostheses to allow for implant fixation through chemical bonding of the coating with surrounding bone tissue. Without a well-adhering coating, this fixation is threatened. Thus, a thorough characterization of the metal / ceramic interface is necessary. This study used a novel composite short bar interfacial fracture toughness technique with high resolution electron spectroscopic imaging to examine Ti-6AI-4V plasma spray coated with 100μm of HA. For this system, an interfacial fracture toughness value of 1.31 +/− 0.08 MPa·m1/2 was obtained, with a corresponding tensile adhesive bond strength of 6.7 +/− 1.5 MPa. High resolution ESI revealed distinct phosphorous segregation to the interface and diffusion into the underlying titanium. A 24-hour post-heat treatment at 960°C greatly increased the bond strength at this interface. Observations from ESI suggested that this effect may be due to enhanced diffusion of both phosphorous and calcium into the metal substrate.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 153: Symposium J – Interfaces Between Polymers, Metals, and Ceramics , 1989 , 377
Copyright
Copyright © Materials Research Society 1989

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