@article{MTMT:34821905, title = {Frequency- and Temperature-Dependent Uncertainties in Hysteresis Measurements of a 3D-Printed FeSi wt6.5% Material}, url = {https://m2.mtmt.hu/api/publication/34821905}, author = {Kocsis, Bence and Orosz, Tamás}, doi = {10.3390/s24092738}, journal-iso = {SENSORS-BASEL}, journal = {SENSORS}, volume = {24}, unique-id = {34821905}, abstract = {Additive manufacturing of soft magnetic materials is a promising technology for creating topologically optimized electrical machines. High-performance electrical machines can be made from high-silicon-content FeSi alloys. Fe-6.5wt%Si material has exceptional magnetic properties; however, manufacturing this steel with the classical cold rolling methodology is not possible due to the brittleness of this material. Laser powder bed fusion technology (L-PBF) offers a solution to this problem. Finding the optimal printing parameters is a challenging task. Nevertheless, it is crucial to resolve the brittleness of the created materials so they can be used in commercial applications. The temperature dependence of magnetic hysteresis properties of Fe-6.5wt%Si materials is presented in this paper. The magnetic hysteresis properties were examined from 20 °C to 120 °C. The hysteresis measurements were made by a precision current generator–based hysteresis measurement tool, which uses fast Fourier transformation–based filtering techniques to increase the accuracy of the measurements. The details of the applied scalar hysteresis sensor and the measurement uncertainties were discussed first in the paper; then, three characteristic points of the static hysteresis curve of the ten L-PBF-manufactured identical toroidal cores were investigated and compared at different temperatures. These measurements show that, despite the volumetric ratio of the porosities being below 0.5%, the mean crack length in the samples is not significant for the examined samples. These small defects can cause a significant 5% decrement in some characteristic values of the examined hysteresis curve.}, year = {2024}, eissn = {1424-8220}, orcid-numbers = {Orosz, Tamás/0000-0002-8743-3989} } @article{MTMT:34789637, title = {Water-Insoluble, Thermostable, Crosslinked Gelatin Matrix for Soft Tissue Implant Development}, url = {https://m2.mtmt.hu/api/publication/34789637}, author = {Varga, Viktória Dóra and Smeller, László and Várdai, Róbert and Kocsis, Bence and Zsoldos, Ibolya and Cruciani, Sara and Pala, Renzo and Hornyák, István}, doi = {10.3390/ijms25084336}, journal-iso = {INT J MOL SCI}, journal = {INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES}, volume = {25}, unique-id = {34789637}, issn = {1661-6596}, abstract = {In this present study, the material science background of crosslinked gelatin (GEL) was investigated. The aim was to assess the optimal reaction parameters for the production of a water-insoluble crosslinked gelatin matrix suitable for heat sterilization. Matrices were subjected to enzymatic degradation assessments, and their ability to withstand heat sterilization was evaluated. The impact of different crosslinkers on matrix properties was analyzed. It was found that matrices crosslinked with butanediol diglycidyl ether (BDDE) and poly(ethylene glycol) diglycidyl ether (PEGDE) were resistant to enzymatic degradation and heat sterilization. Additionally, at 1 v/v % crosslinker concentration, the crosslinked weight was lower than the starting weight, suggesting simultaneous degradation and crosslinking. The crosslinked weight and swelling ratio were optimal in the case of the matrices that were crosslinked with 3% and 5% v/v BDDE and PEGDE. FTIR analysis confirmed crosslinking, and the reduction of free primary amino groups indicated effective crosslinking even at a 1% v/v crosslinker concentration. Moreover, stress–strain and compression characteristics of the 5% v/v BDDE crosslinked matrix were comparable to native gelatin. Based on material science measurements, the crosslinked matrices may be promising candidates for scaffold development, including properties such as resistance to enzymatic degradation and heat sterilization.}, keywords = {Biomaterials; Material science; crosslinked gelatin; scaffold development}, year = {2024}, eissn = {1422-0067}, orcid-numbers = {Varga, Viktória Dóra/0009-0005-8769-1653; Smeller, László/0000-0002-3643-3268; Hornyák, István/0000-0002-7183-8973} } @article{MTMT:34562195, title = {3D printing parameters optimization for Fe-6.5 wt%Si}, url = {https://m2.mtmt.hu/api/publication/34562195}, author = {Kocsis, Bence and Windisch, Márk and Mészáros, István and Varga, Lajos Károly}, doi = {10.1016/j.jmmm.2024.171829}, journal-iso = {J MAGN MAGN MATER}, journal = {JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS}, volume = {592}, unique-id = {34562195}, issn = {0304-8853}, year = {2024}, eissn = {1873-4766}, orcid-numbers = {Kocsis, Bence/0000-0003-4751-5071; Windisch, Márk/0009-0004-3413-2471} } @article{MTMT:33623747, title = {Investigation of Heat-Affected Zones of Thermite Rail Weldings}, url = {https://m2.mtmt.hu/api/publication/33623747}, author = {Fischer, Szabolcs and Harangozó, Dóra and NÉMETH, Dalma and Kocsis, Bence and SYSYN, Mykola and KURHAN, Dmytro and Brautigam, András}, doi = {10.22190/FUME221217008F}, journal-iso = {FACTA UNIV SER MECH ENG}, journal = {FACTA UNIVERSITATIS-SERIES MECHANICAL ENGINEERING}, volume = {22}, unique-id = {33623747}, issn = {0354-2025}, year = {2024}, eissn = {2335-0164}, pages = {689-710}, orcid-numbers = {Fischer, Szabolcs/0000-0001-7298-9960; Brautigam, András/0009-0000-3840-595X} } @article{MTMT:34140032, title = {Iron Loss Calculation Methods for Numerical Analysis of 3D-Printed Rotating Machines: A Review}, url = {https://m2.mtmt.hu/api/publication/34140032}, author = {Orosz, Tamás and Horváth, Tamás and Tóth, Balázs and Kuczmann, Miklós and Kocsis, Bence}, doi = {10.3390/en16186547}, journal-iso = {ENERGIES}, journal = {ENERGIES}, volume = {16}, unique-id = {34140032}, issn = {1996-1073}, abstract = {Three-dimensional printing is a promising technology that offers increased freedom to create topologically optimised electrical machine designs with a much smaller layer thickness achievable with the current, laminated steel-sheet-based technology. These composite materials have promising magnetic behaviour, which can be competitive with the current magnetic materials. Accurately calculating the iron losses is challenging due to magnetic steels’ highly nonlinear hysteretic behaviour. Many numerical methodologies have been developed and applied in FEM-based simulations from the first introduced Steinmetz formulae. However, these old curve-fitting-based iron loss models are still actively used in modern finite-element solvers due to their simplicity and high computational demand for more-accurate mathematical methods, such as Preisach- or Jiles–Atherton-model-based calculations. In the case of 3D-printed electrical machines, where the printed material can have a strongly anisotropic behaviour and it is hard to define a standardised measurement, the applicability of the curve-fitting-based iron loss methodologies is limited. The following paper proposes an overview of the current problems and solutions for iron loss calculation and measurement methodologies and discusses their applicability in designing and optimising 3D-printed electrical machines.}, year = {2023}, eissn = {1996-1073}, orcid-numbers = {Orosz, Tamás/0000-0002-8743-3989; Tóth, Balázs/0000-0002-5419-2234} } @article{MTMT:33113582, title = {3D printed metal-insulator layered structure}, url = {https://m2.mtmt.hu/api/publication/33113582}, author = {Kocsis, Bence and Hatos, István and Varga, Lajos Károly}, doi = {10.1016/j.jmmm.2022.169994}, journal-iso = {J MAGN MAGN MATER}, journal = {JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS}, volume = {563}, unique-id = {33113582}, issn = {0304-8853}, year = {2022}, eissn = {1873-4766} } @article{MTMT:33081965, title = {Preparation and characterization of Fe-SiO 2 soft magnetic composites prepared by classic and modified Stöber Method}, url = {https://m2.mtmt.hu/api/publication/33081965}, author = {Kocsis, Bence and Varga, L K and Zsoldos, Ibolya}, doi = {10.1088/1757-899X/1246/1/012011}, journal-iso = {IOP CONF SER MATER SCI ENG}, journal = {IOP CONFERENCE SERIES: MATERIALS SCIENCE AND ENGINEERING}, volume = {1246}, unique-id = {33081965}, issn = {1757-8981}, abstract = {In this study, gas atomized iron powder with the particle size of 10 - 100 μm was coated in two different ways. The coating was created by a chemical procedure, the powder was treated for different periods of time with the classical and modified Stöber process. Toroidal samples were then prepared using different pressures. These samples were heat treated in an argon shielding gas. The complex permeability spectra of the green and heat-treated samples were measured and the effect of pressure, chemical coating time and heat treatment was investigated. The formation of the coatings in each case was confirmed by scanning electron microscopic examinations. Samples with long-term chemical treatment and without heat treatment were appropriate in high-frequency applications ( μ stat = 50, f FMR = 5 − 15 MHz ). After the heat treatment, the relative initial permeability has increased significantly (160-180) and the resonance frequency has decreased (400-4000Hz). Furthermore, it can be stated that a more coherent, thicker coating can be obtained with the modified Stöber method.}, year = {2022}, eissn = {1757-899X}, pages = {012011-12018} } @article{MTMT:32775068, title = {Development of High-Entropy Alloy Coating by Additive Technology}, url = {https://m2.mtmt.hu/api/publication/32775068}, author = {Kocsis, Bence and Gulyás, Gábor and Varga, Lajos Károly}, doi = {10.3389/fmats.2021.802076}, journal-iso = {FRONT MATER}, journal = {FRONTIERS IN MATERIALS}, volume = {8}, unique-id = {32775068}, year = {2022}, eissn = {2296-8016} } @article{MTMT:32403438, title = {Investigation of the effects of thermit welding on the mechanical properties of the rails}, url = {https://m2.mtmt.hu/api/publication/32403438}, author = {Barna, Vivien and Brautigam, András and Kocsis, Bence and Harangozó, Dóra and Fischer, Szabolcs}, doi = {10.12700/APH.19.3.2022.3.4}, journal-iso = {ACTA POLYTECH HUNG}, journal = {ACTA POLYTECHNICA HUNGARICA}, volume = {19}, unique-id = {32403438}, issn = {1785-8860}, year = {2022}, eissn = {1785-8860}, pages = {37-49}, orcid-numbers = {Brautigam, András/0009-0000-3840-595X; Fischer, Szabolcs/0000-0001-7298-9960} } @inproceedings{MTMT:32787741, title = {Study on the effects of different manufacturing parameters on the properties of maraging steel by DMLS}, url = {https://m2.mtmt.hu/api/publication/32787741}, author = {Fekete, Imre and Kocsis, Bence and Nagy, András Lajos and Hatos, István}, booktitle = {12th IEEE International Conference on Cognitive Infocommunications (CogInfoCom 2021)}, unique-id = {32787741}, year = {2021}, pages = {729-733} }