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Enhancing Hydroxyapatite Coatings through Plasma Spraying for Bioceramic Applications

This research investigates the plasma spraying of Hydroxyapatite (HA) coatings, essential for biocompatible applications in the medical field, such as total hip and dental implants. Despite their advantages, the brittleness of bioceramics necessitates their use as coatings on tougher substrates. Our project focuses on improving the understanding of the deposition process and its influence on coating quality. We aim to identify optimal combinations of composition and treatment to enhance structural properties and ensure better in vivo performance of implant devices.

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Enhancing Hydroxyapatite Coatings through Plasma Spraying for Bioceramic Applications

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  1. Plasma Spraying of HydroxyapatiteTanya Levingstone and Dr. Lisa LooneyMaterials Processing Research Centre, Dublin City University, Dublin 9, IrelandNational Centre for Plasma Science & Technology, Dublin City University, Ireland Introduction: Bioceramics have proven to be attractive materials for repairing and replacing body parts due to their biocompatibility. In many applications bioceramics are used in the form of bulk materials of a specific shape. However in loading bearing applications their inherent brittleness requires them to be used as a coating material on a tougher substrate. Hydroxyapatite (HA) is a bioceramic that has a composition similar to that of bone. As well as improving biocompatibility, it encourages the ingrowth of bone and thus can be used as a method of fixation for implants such as total hip replacements and dental implants. Plasma spraying is the most common means of applying HA coatings to implant devices. It employs a plasma, or ionised gas, to melt the ceramic particulate and to carry it onto the surface of the substrate. [1] The plasma spraying process features complex plasma-particle interactions that can result in significant process variations that often adversely affect process repeatability [2] . Research: Initially adaptations of a basic Hydroxyapatite system will be considered and subsequently optimum combinations of composition, bond coat and post spray treatment will be identified in order to significantly improve the quality of the biocoatings. Comprehensive characterisation of the coatings will be carried out in order to relate powder and process parameters to coating properties. Figure 2: Typical Plasma Spray System [4] Figure 1: Coated Implant –Bone Interface [3] Project Aims: There is currently a poor understanding of how coating deposition process variables influence phase composition, structure and chemical composition of coatings, which in turn affect in vivo performance factors including bioresorption, degradation, bone apposition and adhesion. The project aims to improve the understanding of the structure-property-process relationship to produce improved coatings vital in functional critical applications, such as bioengineering. References: [1] Larry L. Hench & June Wilson (editors), An Introduction to Bioceramics, World Scientific Publishing Co., Singapore, 1993. [2] J.R. Fincke, W.D. Swank, R.L. Bewley, D.C. Haggard, M. Gevelber, D. Wroblewski, Diagnostics and control in the thermal spray process, Surface and Coatings Technology, 146 147 (2001) 537-543 [3] Atlanta Health Pages[Online] www.healthpages.org (Accessed 05: 01: 04) [4] Sulzer Metco [Online] www. Sulzermetco.com (Accessed 05: 01: 04)

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