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Hessisch Lichtenau, Germany

Bielousova O.,National School of Engineering, Saint-Etienne | Kocimski J.,University of Windsor | Maev R.G.,University of Windsor | Smurov I.,National School of Engineering, Saint-Etienne | And 2 more authors.
Surface Engineering

One of the main specific features of the cold spray process is localisation during particle impact deformation. The resultant adiabatic shear instability is the phenomenon that is known to play a major role in the particle/substrate and particle/particle bonding and coating structure formation during the cold spray process. In this article, the cold spray process is numerically simulated as an impact between a single spherical particle with the substrate, and comparison with experimental results for Armco iron and stainless steel particles is made. To describe a deformation behavior of the two materials at high strain rates, the Johnson–Cook model has been chosen. The results indicate that the model accurately captures the grain distortion in the impact zone for both materials. This approach provides valuable information on the characterisation of the strain localisation at the particle/substrate interface. © 2016 Institute of Materials, Minerals and Mining. Source

Ignatev M.,Instytut Obrobki Plastycznej | Rybak T.,Instytut Obrobki Plastycznej | Colonges G.,Projection Plasma Systeme | Scharff W.,IfU Diagnostic systems GmbH | Marke S.,IfU Diagnostic systems GmbH
Acta Metallurgica Slovaca

Metallic silver, silver nanoparticles (AgNp) and nanocomposites based on silver are widely used in medicine, due to their antibacterial and antiseptic properties. The main goals of the present work were: (1) research of various types of liquids containing AgNp (including AgNp produced by biosynthesis technology using dessert plants (nopal, agave) extracts to reduce the silver); (2) research of sedimentation from liquids of AgNp on the surface of Hydroxyapatite (HA) implant coatings deposited by plasma spraying; (2) preliminary evaluation of antibacterial properties of HA coating modified with AgNp. The first test shows significant antibacterial activity of HA coatings containing AgNp produced by biosynthesis technology. Source

Voronov M.,Leibniz Institute for Solid State and Materials Research | Hoffmann V.,Leibniz Institute for Solid State and Materials Research | Wallendorf T.,IfU Diagnostic systems GmbH | Marke S.,IfU Diagnostic systems GmbH | And 5 more authors.
Journal of Analytical Atomic Spectrometry

A novel Acousto-Optical imaging Spectrometer (AOS) was developed with unique features that make it attractive for different applications and fundamental investigations in atomic spectroscopy. Spatial resolution of the AOS is approximately 125 μm. Spectral resolution varies from 0.05 nm to 0.3 nm (full width at half maximum, FWHM) between 250 nm and 800 nm, respectively. Time resolution is 5 ns. Thus, the constructed AOS provides enough spatial, spectral and time resolution for applications in glow discharge imaging spectroscopy. Fast switching between different spectral lines within 200 μs can be used e.g. to investigate the evolution of different spectral lines quasi-simultaneously. © 2012 The Royal Society of Chemistry. Source

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