TY - JOUR A1 - Chavez, Jhohan A1 - Ziolkowski, Marek A1 - Schorr, Philipp A1 - Spiess, Lothar A1 - Böhm, Valter A1 - Zimmermann, Klaus T1 - A method to approach constant isotropic permeabilities and demagnetization factors of magneto-rheological elastomers JF - Journal of Magnetism and Magnetic Materials N2 - The use of non-conventional materials is nowadays of much interest in scientific community. Magneto-rheological elastomers are hybrid materials, which in presence of magnetic fields state a change in their mechanical properties. They are composed by an elastomeric matrix with embedded magnetic particles. One of the most attractive features of these materials is that as soon as the magnetic field is removed from the material, the original mechanical properties are completely recovered, with negligible differences in comparison to the original state. This paper focuses on the study of magnetic characteristics of these smart materials, such as relative permeability and demagnetizing factors, for samples with different volume concentration of ferromagnetic particles. KW - Demagnetization factor KW - Finite element simulations KW - Magneto-rheological elastomer KW - Relative permeability KW - Static magnetic field Y1 - 2021 U6 - https://doi.org/10.1016/j.jmmm.2021.167742 VL - 527 PB - Elsevier ER - TY - GEN A1 - Grad, Marius A1 - Hahn, Konstantin A1 - Noster, Ulf A1 - Spieß, Lothar T1 - Increasing the lifetime of titanium implants through a diffusion-controlled surface treatment T2 - Thüringer Werkstofftag 2023, 14. März 2023, ILmenau Y1 - 2023 U6 - https://doi.org/10.13140/RG.2.2.35933.59360 ER - TY - JOUR A1 - Grad, Marius A1 - Honig, Lars-Hauke A1 - Diemar, Andreas A1 - Flock, Dominik A1 - Spieß, Lothar T1 - Complex material analysis of a TiC coating produced by hot pressing with optical light microscopy, EDS, XRD, GDOES and EBSD JF - Surface & Coatings Technology N2 - The present study investigates the interface between carbon steel and titanium samples annealed at different temperatures (𝜗1 = 800 ◦C and 𝜗2 = 1050 ◦C). In both cases, an observable layer forms at the interface, with its thickness increasing from t𝜗1= 2.75 ± 0.15 μm at 800 ◦C to t𝜗2= 8.86 ± 0.29 μm at 1050 ◦C. The layer’s composition and thickness evolve with temperature. Analysis reveals approximately 40 at.-% carbon concentration in the exterior region, indicating likely titanium carbide creation. X-ray diffraction identifies titanium carbide peaks, while microscopy and elemental mapping confirm compositional gradients at the interface. Electron Backscatter Diffraction (EBSD) shows a gradient in grain size near the TiC surface, reflecting TiC nucleation rates. XRD data detect both titanium carbide and titanium phases, with TiC becoming more prominent at 1050 ◦C. Rietveld analysis further confirms TiC formation. Notably, distinct diffraction patterns on the contact and rear sides suggest a Ti(C, O, N) presence. Depth profiles exhibit varying surface and depth carbon concentrations, attributed to temperature effects. The study successfully demonstrates TiC coating fabrication through hot pressing, wherein Ti(C, O, N) coatings arise from titanium’s affinity for reacting with oxygen and nitrogen. This research contributes to the understanding of phase transformations and interfacial properties in titanium-carbon steel systems. Y1 - 2024 U6 - https://doi.org/10.1016/j.surfcoat.2023.130265 VL - 476 PB - Elsevier ER -