Adhesively bonded hydroxyapatite coatings for orthopaedic implants
Adhesively bonded hydroxyapatite coatings for orthopaedic implants
An adhesively bonded hydroxyapatite coating was developed that offers far superior performance to plasma sprayed coatings together with greater flexibility of design and ease of application without expensive equipment. The coating process was developed and optimised with reference to the fundamentals of adhesive bonding and a finishing process was developed that allows application of the coatings to irregular surfaces and ensures a consistently large area of exposed hydroxyapatite.
The structure and properties of the coatings were studied in comparison to those of plasma spayed coatings. It was found that the hydroxyapatite in the coatings does not undergo the detrimental microstructural and compositional changes that takes place during the conventional plasma- spraying process. The strength and durability of the coating- substrate bond are considerably superior to those of conventional plasma- sprayed coatings, and could be further improved through the use of appropriate substrate pretreatments. The cohesive strength of the adhesively bonded coatings is superior to that of conventional plasma- sprayed coatings, because of reinforcement of the hydroxyapatite by the epoxy and through the elimination of the numerous flaws that weaken plasma- sprayed coatings. A conventional plasma- sprayed hydroxyapatite coating was found to promote the initiation of fatigue cracks in Ti-6Al-4V, both by itself and through the coarse grit- blasting process that must be used as a preteatment to ensure adequate adhesion of the coatings to the substrate. The adhesively bonded coatings had no such effect. (DX184261)
University of Southampton
1994
Evans, Samuel Lewin
(1994)
Adhesively bonded hydroxyapatite coatings for orthopaedic implants.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
An adhesively bonded hydroxyapatite coating was developed that offers far superior performance to plasma sprayed coatings together with greater flexibility of design and ease of application without expensive equipment. The coating process was developed and optimised with reference to the fundamentals of adhesive bonding and a finishing process was developed that allows application of the coatings to irregular surfaces and ensures a consistently large area of exposed hydroxyapatite.
The structure and properties of the coatings were studied in comparison to those of plasma spayed coatings. It was found that the hydroxyapatite in the coatings does not undergo the detrimental microstructural and compositional changes that takes place during the conventional plasma- spraying process. The strength and durability of the coating- substrate bond are considerably superior to those of conventional plasma- sprayed coatings, and could be further improved through the use of appropriate substrate pretreatments. The cohesive strength of the adhesively bonded coatings is superior to that of conventional plasma- sprayed coatings, because of reinforcement of the hydroxyapatite by the epoxy and through the elimination of the numerous flaws that weaken plasma- sprayed coatings. A conventional plasma- sprayed hydroxyapatite coating was found to promote the initiation of fatigue cracks in Ti-6Al-4V, both by itself and through the coarse grit- blasting process that must be used as a preteatment to ensure adequate adhesion of the coatings to the substrate. The adhesively bonded coatings had no such effect. (DX184261)
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Published date: 1994
Identifiers
Local EPrints ID: 458517
URI: http://eprints.soton.ac.uk/id/eprint/458517
PURE UUID: 84c4182a-7441-431a-ae7a-6f24beda50af
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Date deposited: 04 Jul 2022 16:50
Last modified: 04 Jul 2022 16:50
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Author:
Samuel Lewin Evans
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