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Formation and characterization of hydroxyapatite coating layer on Ti-based metal implant by electron-beam deposition

Published online by Cambridge University Press:  31 January 2011

Jae-Man Choi ,
Young-Min Kong ,
Sona Kim ,
Hyoun-Ee Kim ,
Cheol Seong Hwang  and
In-Seop Lee
Jae-Man Choi
Affiliation:
Creative Research Center for Microstructure Science of Materials and School of Materials Science and Engineering, Seoul National University, Seoul, 151-742, Korea
Young-Min Kong
Affiliation:
Creative Research Center for Microstructure Science of Materials and School of Materials Science and Engineering, Seoul National University, Seoul, 151-742, Korea
Sona Kim
Affiliation:
Creative Research Center for Microstructure Science of Materials and School of Materials Science and Engineering, Seoul National University, Seoul, 151-742, Korea
Hyoun-Ee Kim
Affiliation:
Creative Research Center for Microstructure Science of Materials and School of Materials Science and Engineering, Seoul National University, Seoul, 151-742, Korea
Cheol Seong Hwang
Affiliation:
Creative Research Center for Microstructure Science of Materials and School of Materials Science and Engineering, Seoul National University, Seoul, 151-742, Korea
In-Seop Lee
Affiliation:
Research Center of Orthopaedic & Rehabilitation Engineering, Inchon, 403-120, Korea
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Abstract

A hydroxyapatite [HAp; Ca10(PO4)6(OH)2] coating layer was formed on a Ti-based alloy by the electron-beam deposition method. When pure HAp was used as a target for the deposition, an amorphous layer was formed on the metal substrate. By heat treatment in a vacuum at 630 °C, the layer was crystallized into tricalcium phosphate [Ca3(PO4)2]. The crystallization improved the dissolution rate of the layer remarkably; however, at the same time, it deteriorated the bond strength with the substrate. When extra CaO (up to 25 wt%) was added to the target and processed under the same conditions, a layer compositionally close to crystalline HAp was deposited. Before the heat treatment, even though the layer was in amorphous state, the dissolution rate in the physiological solution was extremely low. Furthermore, the bond strength increased remarkably compared to the layer formed by the pure HAp target. Compositional and structural resemblance of the layer with the crystalline HAp was attributed to these improvements in properties.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 7 , July 1999 , pp. 2980 - 2985
Copyright
Copyright © Materials Research Society 1999

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