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21	Laser-Carburisierung von Eisen und Edelstahl / Laser-Carburizing of Iron and Stainless Steel Kahle, Michael 11 January 2006 (has links) No description available. 530 Physik Mathematics and Computer Science Laser Methan Eisen θ-Carbid ε-Carbid Edelstahl Mössbauer amorph Kohlenstoff laser methane iron θ-carbide ε-carbide stainless steel Mössbauer amorphous carbon 33.61 33.68 51.10
22	Investigation of carbon-based coatings on austenitic stainless steel for bipolar plates in proton exchange membrane fuel cells, produced by cathodic arc deposition Steinhorst, Maximilian, Giorgio, Maurizio, Topalski, Slavcho, Roch, Teja 25 November 2019 (has links) Stainless steel bipolar plates are a possible replacement for graphite and composite bipolar plates in fuel cells. However, due to a native oxide layer they exhibit a high interfacial contact resistance (ICR) which lowers the performance. Conductive coatings like gold are a possible solution because they can reduce the contact resistance of metallic bipolar plates. We investigate the pulsed cathodic arc technique for deposition of carbon-based thin films on austenitic stainless steel 316L as cost-efficient alternative. Different types of coatings were prepared by varying the layer structure and processing parameters. Potentiodynamic polarization tests and ICR measurements were conducted to evaluate the performance of the films as conductive and corrosion resistant coatings. It was found that the corrosion resistance of coated austenitic steel samples is improved by both coatings and that measured ICR-values are well below the DOE 2020 target of 10 mΩ/cm2. Kohlenstoffbeschichtung info:eu-repo/classification/ddc/600 ddc:600 info:eu-repo/classification/ddc/620 ddc:620 info:eu-repo/classification/ddc/621 ddc:621 info:eu-repo/classification/ddc/672 ddc:672
23	Influence of the Active Screen Plasma Power during Afterglow Nitrocarburizing on the Surface Modification of AISI 316L Böcker, Jan, Puth, Alexander, Dalke, Anke, Röpcke, Jürgen, van Helden, Jean-Pierre, Biermann, Horst 16 April 2024 (has links) Active screen plasma nitrocarburizing (ASPNC) increases the surface hardness and lifetime of austenitic stainless steel without deteriorating its corrosion resistance. Using an active screen made of carbon opens up new technological possibilities that have not been exploited to date. In this study, the effect of screen power variation without bias application on resulting concentrations of process gas species and surface modification of AISI 316L steel was studied. The concentrations of gas species (e.g., HCN, NH3, CH4, C2H2) were measured as functions of the active screen power and the feed gas composition at constant temperature using in situ infrared laser absorption spectroscopy. At constant precursor gas composition, the decrease in active screen power led to a decrease in both the concentrations of the detected molecules and the diffusion depths of nitrogen and carbon. Depending on the gas mixture, a threshold of the active screen power was found above which no changes in the expanded austenite layer thickness were measured. The use of a heating independent of the screen power offers an additional parameter for optimizing the ASPNC process in addition to changes in the feed gas composition and the bias power. In this way, an advanced process control can be established. info:eu-repo/classification/ddc/620 ddc:620 Oberflächenbehandlung Prozessüberwachung Plasmaspritzen Carbonitrieren Edelstahl Laserbearbeitung

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