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Mechanical properties and corrosion behavior of powder metallurgy iron-hydroxyapatite composites for biodegradable implant applications
Purdue University, West Lafayette, USA.
RISE - Research Institutes of Sweden, Swerea, Swerea IVF.ORCID iD: 0000-0003-4860-8763
Purdue University, West Lafayette, USA.
2016 (English)In: Materials and Design, ISSN 0264-1275, Vol. 109, 556-569 p.Article in journal (Refereed) Published
Abstract [en]

Nine Fe–HA composites were fabricated via powder metallurgy method by varying the amount (2.5, 5, 10 wt%) and particle size (< 1 Όm, 1–10 Όm, 100–200 Όm) of hydroxyapatite (HA) as a bioactive phase in the iron (Fe) matrix. X-ray diffraction did not detect any phase changes in HA after the sintering process. Uniaxial tensile tests measured the strengths of the composites. Polarization and immersion tests estimated the corrosion rates (CR). Yield strength, tensile strength, and ductility of the composites decreased with increasing HA content and decreasing HA particle size, whereas their corrosion rates increased. The strongest composite was Fe–2.5 wt% HA (100–200 Όm) with σy = 81.7 MPa, σu = 130.1 MPa, fracture strain of 4.87%, and CR = 0.23 mmpy. The weakest composite was Fe–10 wt% HA (< 1 Όm) which did not exhibit plastic deformation, fractured at σu = 16.1 MPa with 0.11% strain, and showed the highest CR of 1.07 mmpy. This study demonstrates how the relative particle size between Fe and HA determines the mechanical and corrosion properties of Fe–HA composites, thereby aiding in enhancing future resorbable implant designs. The model can also be used when designing other bioactive composites (i.e. Ti–HA, Mg–HA) via powder metallurgy.

Place, publisher, year, edition, pages
2016. Vol. 109, 556-569 p.
Keyword [en]
Biodegradation; Corrosion; Hydroxyapatite; Iron; Mechanical properties; Metallurgy; Metals; Particle size; Powder metallurgy; Powder metals; Sintering; Tensile strength; Tensile testing; X ray diffraction, Bioactive composites; Biodegradable implants; Biodegradable metals; Corrosion behavior; Hydroxyapatite composite; In-vitro; Mechanical and corrosion properties; Uniaxial tensile test, Corrosion rate
National Category
Other Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-28206DOI: 10.1016/j.matdes.2016.07.092ScopusID: 2-s2.0-84979645281OAI: oai:DiVA.org:ri-28206DiVA: diva2:1083668
Available from: 2017-03-22 Created: 2017-03-22 Last updated: 2017-03-23Bibliographically approved

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