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Hydroxyapatite-coated metals: interfacial reactions during sintering.

M Wei1, A J Ruys, M V Swain

  • 1Department of Mettallurgy and Materials Engineering, University of Connecticut, CT, 06269, USA. m.wei@ims.unconn.edu

Journal of Materials Science. Materials in Medicine
|March 4, 2005
PubMed
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Electrophoretic deposition (EPD) of hydroxyapatite (HA) coatings on metal implants is improved by using metathesis-synthesized HA. Dual HA coatings sintered at 1000°C minimize decomposition and preserve metal implant strength.

Area of Science:

  • Biomaterials Science
  • Materials Engineering
  • Surface Science

Background:

  • Electrophoretic deposition (EPD) offers a cost-effective method for applying hydroxyapatite (HA) coatings to metal implants.
  • A key limitation of EPD is the high sintering temperature required for HA densification, which can degrade metal implants and cause HA decomposition.
  • Recent advancements allow the use of metathesis-synthesized uncalcined HA, which sinters at lower temperatures (around 1000°C).

Purpose of the Study:

  • To investigate the effects of high-temperature sintering on HA coatings applied to titanium (Ti), Ti6Al4V, and 316L stainless steel implants.
  • To evaluate the efficacy of dual HA coatings (applied sequentially with intermediate sintering) in mitigating HA decomposition and preserving implant integrity.
  • To characterize the interfacial zones formed between HA coatings and different metal substrates after sintering.

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Main Methods:

  • Electrophoretic deposition (EPD) of metathesis-synthesized uncalcined HA onto Ti, Ti6Al4V, and 316L stainless steel substrates.
  • Sequential application and sintering of dual HA coatings at approximately 1000°C.
  • Analysis of HA coating integrity, metal substrate tensile strength, and interfacial zone characteristics using X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and Energy Dispersive X-ray Spectroscopy (EDS).

Main Results:

  • Dual HA coatings effectively confined decomposition to the initial layer, leaving the surface coating intact and decomposition-free.
  • Sintering temperatures between 925°C and 1000°C did not significantly affect the tensile strength of the Ti, Ti6Al4V, and 316L stainless steel substrates.
  • XRD/SEM/EDS analysis revealed negligible interfacial zones (<1µm) for HA on 316L stainless steel, but larger zones (>10µm) for HA on Ti and Ti6Al4V, consisting of TiO2 oxidation and CaTiO2 reaction layers.

Conclusions:

  • Metathesis-synthesized HA is suitable for EPD on metal implants, enabling sintering at temperatures compatible with implant materials.
  • Dual coating strategies effectively protect the surface HA layer from decomposition during high-temperature sintering.
  • The substrate material significantly influences the HA-metal interfacial zone, with 316L stainless steel exhibiting minimal interfacial reactions compared to Ti and Ti6Al4V.