Werkstoffkunde

Bargel, Hans-Jürgen; Hilbrans, Hermann; Hübner, Karl-Heinz; Krüger, Oswald; Schulze, Günter

doi:10.1007/3-540-29250-0

Cited by 38 publications

(17 citation statements)

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“…The finely crystalline structure of this surface entails an even higher amount of crystallization seeds and less well separated crystals can be found after electrochemical treatment (see Figure b). It is well known, that thermal treatment of strained metals leads to relaxation of lattice defects and Ostwald ripening (increasing of crystallinity) . Nevertheless, as can be derived from Figure b and 8d, the surface of such an annealed electrode obviously contains enough poorly ordered gold atoms to promote the growth of individual crystals with defined faces.…”

Section: Discussion: Interrelation Of Surface Morphology and Electsupporting

confidence: 91%

Electrochemical Formation of Gold Nanoparticles on Polycrystalline Gold Electrodes during Prolonged Potential Cycling

et al. 2017

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The voltammetric behavior of polycrystalline gold electrodes in 0.1 M sulfuric acid and the influence of prolonged repetitions of oxidation and reduction cycles at different scan rates on the surface morphology was studied. Slow (0.1 V s−1) as well as fast (1.0 V s−1) scan rates lead to an intense roughening of the electrode surface and the formation of a variety of different crystalline particles on it. These crystallites, their formation, and the influence of surface pretreatment were investigated with electrochemical methods, X‐ray diffraction measurements, and scanning electron microscopy. Additionally, an interpretation of the changing electrochemical signals of polycrystalline gold during prolonged potential cycling is given.

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Section: Discussion: Interrelation Of Surface Morphology and Electsupporting

confidence: 91%

Electrochemical Formation of Gold Nanoparticles on Polycrystalline Gold Electrodes during Prolonged Potential Cycling

et al. 2017

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“…It is also possible that no obvious differences exist, either in the mechanical properties or in theloss in volume. The bending displacement at fracture measures the ductility of a material 35. After 3 months the ductility of the coated MgCa0.8 implants reduced compared with their initial value but after 6 months no further change was observed.…”

Section: Discussionmentioning

confidence: 99%

Influence of a magnesium‐fluoride coating of magnesium‐based implants (MgCa0.8) on degradation in a rabbit model

Thomann

Krause

Angrisani

et al. 2010

J Biomedical Materials Res

146

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MgCa0.8 cylinders (2.5 x 25 mm(2)) were coated with a magnesium-fluoride layer and implanted in the marrow cavities of both tibiae of 10 New Zealand White rabbits. The implantation duration was 3 and 6 months. The implants were clinically well tolerated. Micro-computed tomography revealed a new bone formation at the edges of the implants as well as an endosteal and periosteal remodeling. Using EDX-analysis, a calcium and phosphorus rich degradation layer could be found on the implant surface. It was covered by an incomplete layer containing fluoride. The analysis by weight before implantation and after 3 and 6 months, respectively, showed a slight decrease in volume in comparison to uncoated implants. When compared with uncoated implants, the mechanical properties of the coated implants exhibited a reduction in strength after 3 months. After 6 months, the strength of the coated implants was higher than that of uncoated cylinders.

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“…The classic chemical segregation problem, often observed in direct-cast materials, seems to re-manifest itself in AM-materials. Higher melting point elements solidify first and concentrate in the centre of dendrites or grains which form a gradient towards the interdendritic or grain boundaries, in which elements with lower melting points can be enriched [9]. The alloys are highly susceptible to micro-segregation, a non-uniform composition in micrometre scale produced by non-equilibrium solidification.…”

Section: Chemical Inhomogeneitiesmentioning

confidence: 99%

Additive manufacturing – a general corrosion perspective

Örnek

2018

Corrosion Engineering, Science and Technology

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Metallic additive manufacturing will replace some materials produced by conventional fabrication methods in the nearest future. However, corrosion will remain an important aspect needed to be prevented. The corrosion behaviour of additively manufactured alloys has been sparsely studied and very little work has been published so far. In this article, a general discussion about materials produced by additive manufacturing will be provided.

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Werkstoffkunde

Cited by 38 publications

References 0 publications

Electrochemical Formation of Gold Nanoparticles on Polycrystalline Gold Electrodes during Prolonged Potential Cycling

Electrochemical Formation of Gold Nanoparticles on Polycrystalline Gold Electrodes during Prolonged Potential Cycling

Influence of a magnesium‐fluoride coating of magnesium‐based implants (MgCa0.8) on degradation in a rabbit model

Additive manufacturing – a general corrosion perspective

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