A5005618682- Aluminum Alloys Composites Properties
- Aluminum Alloy Microstructure Properties
- Microstructure and mechanical properties
- Metallurgy and Material Forming
- Metal Forming Simulation Techniques
- Magnesium Alloys: Properties and Applications
- Catalysis for Biomass Conversion
- Catalysts for Methane Reforming
- Dental materials and restorations
- Cardiac Imaging and Diagnostics
- Metal and Thin Film Mechanics
- Dental Research and COVID-19
- Cardiac Structural Anomalies and Repair
- Advanced Welding Techniques Analysis
- Intermetallics and Advanced Alloy Properties
- Powder Metallurgy Techniques and Materials
- Takotsubo Cardiomyopathy and Associated Phenomena
- High Temperature Alloys and Creep
- COVID-19 and healthcare impacts
- Nuclear Materials and Properties
- Dental Implant Techniques and Outcomes
- Metal Alloys Wear and Properties
- Advanced Machining and Optimization Techniques
- Atomic and Subatomic Physics Research
- Bauxite Residue and Utilization
TU Bergakademie Freiberg
2007-2025
Christ Hospital
2024
Minneapolis Heart Institute Foundation
2022-2023
University of Minnesota
2023
Abbott Northwestern Hospital
2022
Norsk Hydro (Germany)
2015-2017
Friedrich-Alexander-Universität Erlangen-Nürnberg
2010-2016
University of Bonn
2015
Fraunhofer Institute for Production Technology IPT
2000-2001
Fraunhofer Society
2000
The present study deals with the CO conversion to high‐molecular hydrocarbons using Fischer‐Tropsch (FT) synthesis. Fe2O3 samples Na surface contents between 0 and 10 wt.% were prepared, carbidized characterized X‐ray photoelectron spectroscopy, diffraction, Mössbauer Raman temperature‐programmed reduction by H2 N2 physisorption. correlation of catalytic FT activity‐selectivity physical‐chemical properties showed that promoter electronically activated Fe sites enhancing adsorption carbon...
Abstract The CO 2 ‐based Fischer‐Tropsch synthesis toward liquid hydrocarbons was investigated using a Na‐promoted Fe catalyst recently engineered for high carbon chain growth. As result of systematic variation operation parameters, it shown that maximal yield (13 wt %) with growth probability (0.75) achieved at temperature 350 °C and molar H /CO ratio 3. High‐molecular products such as waxes were not formed. required reaction associated the endothermic reverse water gas shift, which...
Abstract Accumulative roll bonding (ARB) as a method of severe plastic deformation (SPD) is an interesting established process to produce ultrafine‐grained (UFG) sheet materials with high potential for light weight constructions. The ARB offers flexibility tailored material design. Al 2 O 3 particles, carbon fibers and titanium foils are used reinforcement aluminum sheets introduced during accumulative bonding. Furthermore multicomponent produced by cladding different alloys. These...
In patients with angina and non-obstructive coronary artery disease (ANOCA), diagnosis of microvascular dysfunction (CMD) remains an unmet need. Magnetocardiography (MCG), is a rest-based, non-invasive scan that can detect weak electrophysiological changes occur at the early phase ischemia.
The combination of Twin-Roll-Casting (TRC) and subsequent rolling constitutes the most promising process chain for producing magnesium strips economically. Fast solidification (10 times faster than continuous casting) combined with partial deformation lead to a fine primary microstructure as well less shrinking holes, pores, segregations brittle precipitations which all together has very positive effect on forming behavior initial material quality final product. paper elaborates...
The formation of alloys by particle reinforcement during accumulative roll bonding (ARB), and subsequent annealing, is introduced on the basis binary alloy system Al-Cu, where strength electrical conductivity are examined in different microstructural states. An ultimate tensile (UTS) 430 MPa for Al with 1.4 vol.% Cu was reached after three ARB cycles, which almost equals UTS commercially available Al-Cu AA2017A a similar copper content. Regarding conductivity, UFG structure had no...
Abstract Graded distributions of copper particles in ultrafine‐grained aluminium sheets are produced by accumulative roll bonding and particle reinforcement. The metallic sprayed on the sheet surfaces under variation spray distance and/or relative velocity gun to sheet. Therewith, content could be varied a factor three. After solutionizing, successful gradation is clearly proven tensile tests showing steady monotonous gradient along rolling direction. By systematic analysis spraying process,...
Dispersed nanoparticles are introduced from stabilized suspensions during the accumulative roll bonding process in aluminium AA1050A by air gun spraying up to a final volume fraction of 0.1 % after eight cycles. Additional strengthening caused particle insertion is observed and strongly depends on suspension medium stabilizing agent as both influence interfacial particles matrix. The furthermore results reduced peel strength sheets irrespective material size reduction effective metal area...
Abstract Three Fe catalysts with different Na contents were prepared, characterized, and investigated for the CO 2 ‐based Fischer‐Tropsch synthesis (FTS). The FTS results clearly indicated that selectivity towards long‐chain hydrocarbons was driven by surface content, which promotes dissociation chain propagation. Additionally, it shown 3 O 4 , 5 C 7 coexist during FTS, revealing specific catalytic activity. As a result, tandem mechanism suggested conversion, consisting in reverse water‐gas...
Using ceramic materials for an automatic production of dentures by CAD/CAM is a challenge, because many technological, medical, and optical demands must be considered. The IPS Empress 2 framework meets most them. This study shows the possibilities machining this with economical parameters. long life-time requirement requires ductile machined surface to avoid well-known subsurface damages brittle caused machining. Slow rapid damage propagation begins at break outs cracks, limits...
Due to the deformation mechanisms and typical basal texture rolled magnesium sheets show a significant asymmetry of flow stress in tension compression. In order avoid this undesired behavior it is necessary achieve non-basal during rolling, or at least, reduce intensity component. The reduction anisotropy caused by very important for subsequent forming processes. This project aims optimizing hot rolling process with special consideration effects. development model carried out close...
Aluminium alloy AA6016 was accumulative roll bonded up to eight cycles in order produce an ultrafine-grained microstructure. The formability of these sheets investigated by means bending tests. Furthermore the influence a local laser heat treatment at edge is observed. strength UFG samples increased factor around two compared conventionally grained T4 condition which also results 50 % higher punch forces needed for ARB processed samples. An anisotropic behaviour By applying tailored along...
For having the lowest density of all metal construction materials 1.75 kg/dm, magnesium wrought alloys are outstanding lightweight materials. The low formability at room temperature limits industrial use AZ31B-O. In this paper influence high strain rates was investigated with aim to improve alloy AZ31B-O temperature. negative rate sensitivity quasi-static causes an early loss material stability due formation local deformation zones on work piece surface. This leads a in forming state plane...
The deformation and hardening mechanisms of magnesium usually lead to a typical basal orientation crystals during production sheets by forming techniques. texture related anisotropic property behavior especially the further decrease in formability at room temperature is disadvantageous undesired for subsequent rolling final processes.The objective this work find methods improve these texture-related properties cold ability sheets. Firstly, different temperatures pass reductions, with goal...