Interfacial bond strength of electrophoretically deposited hydroxyapatite coatings on metals

Wei, M; Ruys, AJ; Swain, MV; Kim, SH; Milthorpe, BK; Sorrell, CC

Interfacial bond strength of electrophoretically deposited hydroxyapatite coatings on metals

Wei, M Ruys, AJ Swain, MV Kim, SH Milthorpe, BK

Sorrell, CC

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Publication Type:: Journal Article
Citation:: Journal of Materials Science: Materials in Medicine, 1999, 10 (7), pp. 401 - 409
Issue Date:: 1999-01-01

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Field	Value	Language
dc.contributor.author	Wei, M	en_US
dc.contributor.author	Ruys, AJ	en_US
dc.contributor.author	Swain, MV	en_US
dc.contributor.author	Kim, SH	en_US
dc.contributor.author	Milthorpe, BK https://orcid.org/0000-0002-0867-9586	en_US
dc.contributor.author	Sorrell, CC	en_US
dc.date.issued	1999-01-01	en_US
dc.identifier.citation	Journal of Materials Science: Materials in Medicine, 1999, 10 (7), pp. 401 - 409	en_US
dc.identifier.issn	0957-4530	en_US
dc.identifier.uri	http://hdl.handle.net/10453/9773
dc.description.abstract	Hydroxyapatite (HAp) coatings were deposited onto substrates of metal biomaterials (Ti, Ti6Al4V, and 316L stainless steel) by electrophoretic deposition (EPD). Only ultra-high surface area HAp powder, prepared by the metathesis method (10Ca(NO3)2 + 6(NH4)2HPO4 + 8NH4OH), could produce dense coatings when sintered at 875-1000°C. Single EPD coatings cracked during sintering owing to the 15-18% sintering shrinkage, but the HAp did not decompose. The use of dual coatings (coat, sinter, coat, sinter) resolved the cracking problem. Scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS) inspection revealed that the second coating filled in the 'valleys' in the cracks of the first coating. The interfacial shear strength of the dual coatings was found, by ASTM F1044-87, to be ~ 12 MPa on a titanium substrate and ~ 22 MPa on 316L stainless steel, comparing quite favorably with the 34 MPa benchmark (the shear strength of bovine cortical bone was found to be 34 MPa). Stainless steel gave the better result since α-316L (20.5 μm mK-1) > α-HAp (~ 14 μm mK-1), resulting in residual compressive stresses in the coating, whereas α-titanium (~ 10.3 μm mK-1) < α-HAp, resulting in residual tensile stresses in the coating.	en_US
dc.relation.ispartof	Journal of Materials Science: Materials in Medicine	en_US
dc.relation.isbasedon	10.1023/A:1008923029945	en_US
dc.subject.classification	Biomedical Engineering	en_US
dc.title	Interfacial bond strength of electrophoretically deposited hydroxyapatite coatings on metals	en_US
dc.type	Journal Article
utslib.citation.volume	7	en_US
utslib.citation.volume	10	en_US
utslib.for	090302 Biomechanical Engineering	en_US
utslib.for	090301 Biomaterials	en_US
utslib.for	110304 Dermatology	en_US
utslib.for	0903 Biomedical Engineering	en_US
utslib.for	0912 Materials Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Strength - CHT - Health Technologies
utslib.copyright.status	closed_access
pubs.issue	7	en_US
pubs.publication-status	Published	en_US
pubs.volume	10	en_US

Abstract:

Hydroxyapatite (HAp) coatings were deposited onto substrates of metal biomaterials (Ti, Ti6Al4V, and 316L stainless steel) by electrophoretic deposition (EPD). Only ultra-high surface area HAp powder, prepared by the metathesis method (10Ca(NO3)2 + 6(NH4)2HPO4 + 8NH4OH), could produce dense coatings when sintered at 875-1000°C. Single EPD coatings cracked during sintering owing to the 15-18% sintering shrinkage, but the HAp did not decompose. The use of dual coatings (coat, sinter, coat, sinter) resolved the cracking problem. Scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS) inspection revealed that the second coating filled in the 'valleys' in the cracks of the first coating. The interfacial shear strength of the dual coatings was found, by ASTM F1044-87, to be ~ 12 MPa on a titanium substrate and ~ 22 MPa on 316L stainless steel, comparing quite favorably with the 34 MPa benchmark (the shear strength of bovine cortical bone was found to be 34 MPa). Stainless steel gave the better result since α-316L (20.5 μm mK-1) > α-HAp (~ 14 μm mK-1), resulting in residual compressive stresses in the coating, whereas α-titanium (~ 10.3 μm mK-1) < α-HAp, resulting in residual tensile stresses in the coating.

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http://hdl.handle.net/10453/9773