Hydroxyapatite-coated metals: Interfacial reactions during sintering

We, M; Ruys, AJ; Swain, MV; Milthorpe, BK; Sorrell, CC

Hydroxyapatite-coated metals: Interfacial reactions during sintering

We, M Ruys, AJ Swain, MV Milthorpe, BK

Sorrell, CC

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Publication Type:: Journal Article
Citation:: Journal of Materials Science: Materials in Medicine, 2005, 16 (2), pp. 101 - 106
Issue Date:: 2005-02-01

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Field	Value	Language
dc.contributor.author	We, M	en_US
dc.contributor.author	Ruys, AJ	en_US
dc.contributor.author	Swain, MV	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.available	2004-08-12	en_US
dc.date.issued	2005-02-01	en_US
dc.identifier.citation	Journal of Materials Science: Materials in Medicine, 2005, 16 (2), pp. 101 - 106	en_US
dc.identifier.issn	0957-4530	en_US
dc.identifier.uri	http://hdl.handle.net/10453/12796
dc.description.abstract	Electrophoretic deposition (EPD) is a low cost flexible process for producing HA coatings on metal implants. Its main limitation is that it requires heating the coated implant in order to densify the HA. HA typically sinters at a temperature below 1150°C, but metal implants are degraded above 1000°C. Further, the metal induces the decomposition of the HA coating upon sintering. Recent developments have enabled EPD of metathesis-synthesised uncalcined HA which sinters at ∼ 1000°C. The effects of temperature on HA-coated Ti, Ti6Al4V, and 316L stainless steel were investigated for dual coatings of metathesis HA sintered at 1000°C. The use of dual HA coatings (coat, sinter, coat, sinter) enabled decomposition to be confined to the "undercoat" (HA layer 1), with the surface coating decomposition free. The tensile strength of the three metals was not significantly affected by the high sintering temperatures (925°C < T < 1000°C). XRD/SEM/EDS analyses of the interfacial zones revealed that 316L had a negligible HA:metal interfacial zone (∼1 μm) while HA:Ti and HA:Ti6Al4V had large interfacial zones (>10 μm) comprising a TiO2 oxidation zone and a CaTiO3 reaction zone. © 2005 Springer Science + Business Media, Inc.	en_US
dc.relation.ispartof	Journal of Materials Science: Materials in Medicine	en_US
dc.relation.isbasedon	10.1007/s10856-005-5995-6	en_US
dc.subject.classification	Biomedical Engineering	en_US
dc.subject.mesh	Durapatite	en_US
dc.subject.mesh	Titanium	en_US
dc.subject.mesh	Stainless Steel	en_US
dc.subject.mesh	Metals	en_US
dc.subject.mesh	Coated Materials, Biocompatible	en_US
dc.subject.mesh	Electrophoresis	en_US
dc.subject.mesh	Materials Testing	en_US
dc.subject.mesh	Electroplating	en_US
dc.subject.mesh	Surface Properties	en_US
dc.subject.mesh	Tensile Strength	en_US
dc.subject.mesh	Hot Temperature	en_US
dc.title	Hydroxyapatite-coated metals: Interfacial reactions during sintering	en_US
dc.type	Journal Article
utslib.citation.volume	2	en_US
utslib.citation.volume	16	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	2	en_US
pubs.publication-status	Published	en_US
pubs.volume	16	en_US

Abstract:

Electrophoretic deposition (EPD) is a low cost flexible process for producing HA coatings on metal implants. Its main limitation is that it requires heating the coated implant in order to densify the HA. HA typically sinters at a temperature below 1150°C, but metal implants are degraded above 1000°C. Further, the metal induces the decomposition of the HA coating upon sintering. Recent developments have enabled EPD of metathesis-synthesised uncalcined HA which sinters at ∼ 1000°C. The effects of temperature on HA-coated Ti, Ti6Al4V, and 316L stainless steel were investigated for dual coatings of metathesis HA sintered at 1000°C. The use of dual HA coatings (coat, sinter, coat, sinter) enabled decomposition to be confined to the "undercoat" (HA layer 1), with the surface coating decomposition free. The tensile strength of the three metals was not significantly affected by the high sintering temperatures (925°C < T < 1000°C). XRD/SEM/EDS analyses of the interfacial zones revealed that 316L had a negligible HA:metal interfacial zone (∼1 μm) while HA:Ti and HA:Ti6Al4V had large interfacial zones (>10 μm) comprising a TiO2 oxidation zone and a CaTiO3 reaction zone. © 2005 Springer Science + Business Media, Inc.

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http://hdl.handle.net/10453/12796