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Oral Poster

Degradation behavior of as cast and powder metallurgy processed Mg-Ca alloys

Tuesday (09.05.2017)
18:24 - 18:27
Part of:
18:00 Oral Poster Fibrinogen Adsorption and Network Formation on Melt Drawn Isotactic Polybutene-1 Thin Films 1 Xiaoyuan Zhang
18:03 Oral Poster Characterization of biomaterials using AFM based fast nanoscale imaging and quantitative nanomechanical techniques 1 Dr. Tanja Neumann
18:06 Oral Poster Hydrothermal conversion of porous Ca carbonate biominerals into bioactive Ca phosphate materials: towards antibiotic and antiosteoporotic bone graft substitutes 1 Dr. Ingo Sethmann
18:09 Oral Poster Study on the retarding effect of phytic acid on the hydration of a brushite cement 1 Dr. Katrin Hurle
18:12 Oral Poster Synthesis of hollow mesoporous bioactive glass nanoparticles with uniform size and shape 1 Kai Zheng
18:15 Oral Poster Systematic post-operative clinical assessment of lumbar ventrolateral vertebroplasty in the large animal model sheep using a minimally-invasive approach 1 Francesca Gunnella
18:18 Oral Poster Dual setting system – characterization of PEG-based-hydrogel/brushite composites for biomedical application 1 Michaela Rödel
18:21 Oral Poster The effect of HAc etching on the degradation behaviour of Mg-5Gd 1 Dr. Frank Feyerabend
18:24 Oral Poster Degradation behavior of as cast and powder metallurgy processed Mg-Ca alloys 0 Dipl.-Ing. Eshwara Phani Shubhakar Nidadavolu
18:27 Oral Poster Bio-inspired high-performance green biopolymer fibers 1 Dr. Hendrik Bargel
18:30 Oral Poster Diatom Biosilica for Catalytic and Adsorptive Applications 1 Cathleen Fischer
18:33 Oral Poster Gallotannin polyphenol enhancement of biomimetic enzymatic hydrogel mineralization 1 Dr. Timothy E.L. Douglas
18:36 Oral Poster Starch in textile application: Modification, processing and product development 1 Pavan Kumar Manvi
18:39 Oral Poster Recombinant Spider Silk Proteins Used as Biomedical Coating Material 1 Christian Borkner
18:42 Oral Poster Effects of cross-linking modifications on Collagen: a preliminary biological evaluation 1 Dr. Mattia Vacchini
18:45 Oral Poster Endothelialization of polymethylpentene fibers as a step towards patient-specific medical devices 1 M.Sc. Annika Wenz
18:48 Oral Poster Hybrid poly-lactide/gelatin electrospun scaffolds with controlled hydrophilicity and wettability. 1 Germano Piccirillo
18:51 Oral Poster Funktion and structure - Combined optical functionality and specific bio-interaction for multifunctional biomedical materials 1 Dr. Tina Sabel
18:57 Oral Poster Bacterial adhesion to PEEK compared to exemplary dental ceramic, metallic and composite materials 1 Dr. Lutz Scheideler
19:00 Oral Poster Attachment of Nanoparticle Drug-Release Systems on Shish-Kebab structured Poly(?-Caprolactone) Nanofibers 1 Dominik de Cassan
19:06 Oral Poster Improved Nanofleeces for Cell Culture Applications 1 Tobias Kürbitz

Session P.1: Oral Poster Session 1
Belongs to:
Topic P: Postersession

Magnesium alloys have gained importance as potential orthopedic implant materials mainly owing to their biodegradability and mechanical properties matching to that of bone. Various Mg alloys have been investigated over the recent years for biomedical applications. Mg-Ca alloys, in particular, are of interest as Ca is an essential element in human body and favors the formation of hydroxyapatite layer. However, the increased Mg2Ca secondary phase content with increasing Ca addition creates galvanic circuits between matrix and secondary phase, resulting in pitting corrosion in these alloys. Previous experiments on as cast Mg-Ca alloys showed promising results as potential orthopedic implant materials at ≤ 1wt.% Ca additions in Mg. Hence, different Mg-xCa alloys (x= 0.3, 0.6, 0.9 wt.%) were processed by permanent mould chill casting and powder metallurgy (PM) routes. Their ‘mean degradation depth, MDD (µm)’ values were measured by three day immersion test procedure. Physiological cell-culture medium (DMEM+ Glutamax) with protein content (10% FBS) and 1% Penicillin Streptomycin was employed as cell-culture medium. Grain size and porosity values of these alloys were measured by optical microscopy. The amount of secondary phase and its distribution was evaluated by SEM and EDX analysis in conjunction with AnalySIS Pro image analysis software. The immersion test results reveal that the amount of secondary phase is crucial in determining the degradation behavior of PM processed Mg-xCa alloys. However, in cast alloys, the counter acting effect of reduction in grain size with increase in distribution of secondary phase resulted in similar MDD values of 0.64-0.74 µm in these alloys. Of all the six alloys investigated, the PM processed Mg-0.3Ca alloy shows the highest degradation resistance with a low MDD value of 0.39 µm. Further on, a 6 week long term immersion test performed on this alloy revealed the ‘mean degradation rate, MDR (µm/day)’ as 0.51 µm/day.

Additional Authors:
  • Dr. Frank Feyerabend
    Helmholtz-Zentrum Geesthacht
  • Dr. Thomas Ebel
    Helmholtz-Zentrum Geesthacht
  • Prof. Dr. Regine Willumeit-Römer
    Helmholtz-Zentrum Geesthacht
  • Prof. Dr. Michael Dahms
    Hochschule Flensburg