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Poster

Influence of pulsed bias voltage on the tribological and morphological properties of a-C coatings deposited by an anodic arc method

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- Plenary Lecture Test Ploetz 1 Alexia Ploetz
- Poster Investigating Dynamic Biological Processes with High-Speed, High-Resolution Correlative AFM-Light Microscopy 1 Oilibhe Pabsch
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- Poster Cytotoxicity of gold nanorods and nanoribbons in context of biomedical applications 1 Marika Musielak
- Poster Preliminary studies of synthesis of gold nanoribbons using selected dicationic surfactants 1 Joanna Patalas
- Poster Diclofenac release from a silicon based hydrogel for contact lenses controlled by a layer-by-layer coating 1 Prof. Ana Serro
- Poster Synthesis, solubility and optical activity of chiral poly(2,4-disubstituted-2-oxazoline)s 1 Mengshi Yang
- Poster Influence of Cu2+-doping in β-TCP on the hydration kinetics of brushite cement investigated by Rietveld analysis and heat flow calorimetry 1 Karla Späth
- Poster Analytical investigation of the influence of micro- and nanoplastic particles in crop plants by electron microscopic imaging and spectroscopy 1 Dr. Jörg Wissler
- Poster Influence of fluoride corrosion attack on the metal-porcelain bond strength of TiCr20 compared to titanium 1 Christine Schille
- Poster Bacterial nanocellulose loaded with frankincense extract as natural wound dressing to treat local dermal inflammations 1 Berit Karl
- Poster Graded functionalization of polydopamine coated fiber mats as potential implant for tendon-bone-transition 1 Sarah Oehmichen
- Poster Enhancing the functionalities of bioactive glass-based scaffolds by novel polymeric coatings 1 Dr. Liliana Liverani
- Poster Durability analysis of the cryopreservation of DNA origami nanostructures 1 Yang Xin
- Poster Effects of staple age on DNA origami nanostructure assembly and stability 1 Charlotte Kielar
- Poster Dual-setting brushite-silica gel cements – Variations of the monomer precursors and tuning of the setting parameters 1 Ib Holzmeister
- Poster Novel QCM-D/microscopy set-up for real-time analysis of bacterial binding onto biomaterial-coated sensors 1 Dr. Zeqian Xu
- Poster Chairside plasma activation of encapsulated implants: how fast is it? 1 Miguel Angel Garcia Chame
- Poster Nanostructured high-pressure laminate surfaces to reduce transmission pathways of pathogens in public transportation 1 Christian Helbing
- Poster Biomineralization of Recombinant Spider Silk Films 1 Vanessa J. Neubauer
- Poster Modification of bacterial cellulose to enhance anti-inflammatory wound dressing properties 1 Uwe Beekmann
- Poster Absolute Characterization of Synthetic Macromolecules used in Biomaterials Science Applications 1 Mandy Grube
- Poster Biodegradable thermoplastic materials for bimodal imaging containing the mineral present in the human body 1 Zaneta Górecka
- Poster Nano-rough titanium surfaces created by wet alkaline etching and PVD and their influence on bacterial adhesion as well as protein adsorption 1 Michaela Schürmann
- Poster Effective strategies for the controlling and dealing with transmission pathway of pathogens in air traffi 1 Christian Helbing
- Poster Cytotoxicity evaluation of biodegradable Zn-4Cu alloy using L929, Saos-2 and TAg cell lines 1 Ping Li
- Poster Influence of pulsed bias voltage on the tribological and morphological properties of a-C coatings deposited by an anodic arc method 1 Dipl.-Ing. Ingo Erdmann

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In order to reduce friction and wear on metal joint implants and increase their biocompatibility, thin nanostructured amorphous carbon (a-C) coatings are applied. This is done in a PVD process, in which an arc is ignited by means of DC-discharge between two graphite electrodes.

The arc is maintained for a period of 180 seconds while the distance of the evaporating graphite electrodes is kept constant. During coating process the substrates are subjected to different negative pulsed bias voltages, whose frequency and pulse width are variable.


The deposited layers are then analyzed with Raman-Spectroscopy to determine the ratio of sp2 and sp3 bonds. The thicknesses of coatings are measured using a laser scanning microscope.

Subsequently, the coated substrates are, in pairs, exposed to a fretting test in a medium of demineralized water with a tribometer. Here the coefficient of friction is investigated and correlated with the likewise conducted roughness test. The abrasion particles are made available for expertise in a scanning electron microscope by microfiltration and the particle size distribution is determined by means of a laser diffraction spectrometer.


The aim of this investigation was to expose the influence of the bias voltage on the tribological and morphological properties of a-C coatings in particular in the range of -750 V to -1200 V bias.


It was found that an increment of the negative bias voltage results in a lower density and roughness of the layers and in addition, the ratio of large abrasive particles continuously decreases. This leads to a significant improvement of the biocompatibility and thus to an increasing durability of joint implants.


Keywords:

amorphous carbon coatings, Raman-spectroscopy, tribometer, particle size distribution

 

Speaker:
Dipl.-Ing. Ingo Erdmann
University of Wuppertal
Additional Authors:
  • Prof. Dr. Friederike Deuerler
    University of Wuppertal
  • Prof. Dr. Volker Buck
    University of Duisburg-Essen (UDE)