TY - JOUR AU - Farkas, Csaba AU - Xiao, Dan AU - Knez, Katharina AU - Qi, Yue AU - Gohs, Uwe AU - Harre, Kathrin AU - Berényi, Richárd AU - Sonmez, Maria AU - Gurau, Dana AU - Georgescu, Mihai AU - Constantinescu, Doina AU - Géczy, Attila TI - Sustainable, flame-retarded and biodegradable printed circuit boards based on Polylactic Acid (PLA) with wool-fibre reinforcement: review of processing and manufacturing technologies JF - RESULTS IN ENGINEERING J2 - RESULT ENGIN VL - 28 PY - 2025 PG - 20 SN - 2590-1230 DO - 10.1016/j.rineng.2025.108034 UR - https://m2.mtmt.hu/api/publication/36416775 ID - 36416775 AB - Among the increasing utilisation of biopolymers, polylactic acid (PLA) has gained significant attention as a biodegradable alternative to petroleum-based plastics in various applications, including electronics, packaging, and biomedical fields. Because of its enormous potential as a green and eco-friendly substitution for traditional printed circuit board (PCB) substrates, and its satisfactory reliability in many prototype applications, PLA reached the most important stage in the line of alternative materials for designing future-proof and sustainable electronic devices. Due to the growing demand for environmentally friendly products from both the industry and customers, innovative solutions' sustainability needs equal weight with their performance and dependability. This study focuses on creating a narrative and scoping review to investigate the typical properties of PLA. It summarises the processing and manufacturing techniques that convert PLA into printed circuit substrates. The paper explores the basic parameters and different compositions of PLA with reinforcement materials, focusing on a specific fibre addition, wool. As an added value, the manuscript presents the related eco-friendly flame-retardant solutions. The currently applied subtractive (e.g. compression and casting methods) and additive (e.g. inkjet printing, 3D printing) fabrication methods are investigated, pointing out the benefits and shortcomings through the foregoing research projects and the presented applications. The assembly practices of electronics on PLA are also investigated, and typical routines of component mounting and soldering methods are compared. The paper aims to cover the research gap in fibre-reinforced, sustainable, flame retarded PLA substrates for future green electronics. LA - English DB - MTMT ER - TY - CHAP AU - Gharaibeh, Ali AU - Dayoub, Ali AU - Berényi, Richárd AU - Medgyes, Bálint TI - Electrochemical Migration: A Short State-of-the-Art Overview T2 - 2025 IEEE 31st International Symposium for Design and Technology in Electronic Packaging (SIITME) PB - IEEE CY - Piscataway (NJ) SN - 9798331568696 T3 - IEEE International Symposium for Design and Technology in Electronic Packaging, ISSN 2641-287X PY - 2025 SP - 152 EP - 159 PG - 8 DO - 10.1109/SIITME67657.2025.11293708 UR - https://m2.mtmt.hu/api/publication/36609953 ID - 36609953 LA - English DB - MTMT ER - TY - JOUR AU - Géczy, Attila AU - Piffkó, Dániel AU - Berényi, Richárd AU - Dusek, Karel AU - Xavier, Pascal AU - Cuartielles, David TI - Implementation of microcontroller board on a sustainable and degradable PLA/Flax composite substrate: a case study JF - NANOTECHNOLOGY J2 - NANOTECHNOLOGY VL - 35 PY - 2024 IS - 43 PG - 12 SN - 0957-4484 DO - 10.1088/1361-6528/ad66d3 UR - https://m2.mtmt.hu/api/publication/35145793 ID - 35145793 AB - In this paper, we present a novel polylactic-acid/flax-composite substrate and the implementation of a demonstrator: a microcontroller board based on commercial design. The substrate is developed for printed circuit board (PCB) applications. The pre-preg is biodegradable, reinforced, and flame-retarded. The novel material was developed to counter the increasing amount of e-waste and to improve the sustainability of the microelectronics sector. The motivation was to present a working circuit in commercial complexity that can be implemented on a rigid substrate made of natural, bio-based materials with a structure very similar to the widely used Flame Retardant Class 4 (FR4) substrate at an early technological readiness level (TRL 2-3). The circuit design is based on the Arduino Nano open-source microcontroller board design so that the demonstration could be programmable and easy to fit into education, IoT applications, and embedded designs. During the work, the design was optimized at the level of layout. The copper-clad pre-preg was then prepared and processed with subtractive printed wiring technology and through hole plating. The traditional surface mounting methodology was applied for assembly. The resulting yield of PCB production was around 50%. Signal analysis was successful with analogue data acquisition (voltage) and low-frequency (4 kHz) tests, indistinguishable from sample FR4 boards. Eventually, the samples were subjected to highly accelerated stress test (HAST). HAST tests revealed limitations compared to traditional FR4 printed circuit materials. After six cycles, the weight loss was around 30% in the case of PLA/Flax, and as three-point bending tests showed, the possible ultimate strength (25 MPa at a flexural state) was reduced by 80%. Finally, the sustainability aspect was assessed, where we found that ~95vol% and ~90wt% of the traditional substrate can be substituted, significantly easing the load of waste on the environment. LA - English DB - MTMT ER - TY - JOUR AU - Nagy, Márton AU - Bán, Krisztián Péter AU - Fogarassy, Zsolt AU - Berényi, Richárd TI - Amorf és nanokristályos lágymágneses anyagok bevezethetőségének vizsgálata gépjármű elektromotorok gyártásába JF - BÁNYÁSZATI ÉS KOHÁSZATI LAPOK-KOHÁSZAT J2 - BKL KOHÁSZAT VL - 153 PY - 2020 IS - 1 SP - 40 EP - 43 PG - 4 SN - 0005-5670 UR - https://m2.mtmt.hu/api/publication/31809068 ID - 31809068 LA - Hungarian DB - MTMT ER - TY - CHAP AU - Straubinger, Dániel AU - Illés, Balázs György AU - Berényi, Richárd AU - Géczy, Attila ED - IEEE, null TI - Simulation of reflow-based heat transfer on different thermocouple constructions T2 - 2020 43rd International Spring Seminar on Electronics Technology (ISSE) PB - Institute of Electrical and Electronics Engineers (IEEE) CY - Piscataway (NJ) SN - 9781728167732 PY - 2020 PG - 6 DO - 10.1109/ISSE49702.2020.9120968 UR - https://m2.mtmt.hu/api/publication/31357232 ID - 31357232 LA - English DB - MTMT ER - TY - CHAP AU - Szurdan, Szabolcs AU - Medgyes, Bálint AU - Mende, Tamás AU - Berényi, Richárd AU - Gál, László AU - Harsányi, Gábor ED - Chindris, Gabriel TI - Reliability Tests on SAC-xMn Solder Alloys T2 - 2019 IEEE 25th International Symposium for Design and Technology in Electronic Packaging (SIITME) PB - Institute of Electrical and Electronics Engineers (IEEE) CY - Piscataway (NJ) SN - 9781728133300 PY - 2019 SP - 34 EP - 37 PG - 4 DO - 10.1109/SIITME47687.2019.8990729 UR - https://m2.mtmt.hu/api/publication/31177406 ID - 31177406 LA - English DB - MTMT ER - TY - JOUR AU - Berényi, Richárd AU - Ruszinkó, Miklós TI - Integrált induktivitások lézeres megmunkálással segített készítése JF - ELEKTRONIKAI TECHNOLÓGIA ÉS GYÁRTÁSINFORMATIKA J2 - ELEKTRON TECHNOL GYÁRTINFORM VL - 1 PY - 2018 IS - 2 SP - 19 EP - 23 PG - 5 SN - 2631-0813 DO - 10.35403/etesgyi.2018.02.019 UR - https://m2.mtmt.hu/api/publication/34140122 ID - 34140122 LA - Hungarian DB - MTMT ER - TY - CHAP AU - Medgyes, Bálint AU - Szabo, P AU - Adam, S AU - Tar, L AU - Ruszinkó, Miklós AU - Berényi, Richárd ED - Nicolics, J TI - Electrochemical Migration of ENIG surface finish in Na2SO4 Environment T2 - 2018 41st International Spring Seminar on Electronics Technology (ISSE) PB - Institute of Electrical and Electronics Engineers (IEEE) CY - New York, New York SN - 9783319738475 T3 - International Spring Seminar on Electronics Technology ISSE, ISSN 2161-2528 PY - 2018 PG - 5 DO - 10.1109/ISSE.2018.8443622 UR - https://m2.mtmt.hu/api/publication/3426440 ID - 3426440 AB - The electrochemical migration (ECM) behavior of Electroless Nickel Immersion Gold (ENIG) surface finish was studied using Na2SO4 solutions with various concentrations. The investigations were carried out by water drop (WD) test. During WD test the electrochemical processes were followed by electrical and visual inspections. Based on the mean-time-to-failure (MTTF) data it was shown that MTTF increased at 0.1 mM Na2SO4 solution, then on higher concentrations MTTF significantly decreased and stabilized over the concentrations. LA - English DB - MTMT ER - TY - JOUR AU - Tengsuthiwat, J AU - Siengchin, S AU - Berényi, Richárd AU - Karger-Kocsis, József TI - Ultraviolet nanosecond laser ablation behavior of silver nanoparticle and melamine–formaldehyde resin-coated short sisal fiber-modified PLA composites JF - JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY J2 - J THERM ANAL CALORIM VL - 132 PY - 2018 IS - 2 SP - 955 EP - 965 PG - 11 SN - 1388-6150 DO - 10.1007/s10973-018-7048-7 UR - https://m2.mtmt.hu/api/publication/3355258 ID - 3355258 N1 - Összes idézések száma a WoS-ban: 0 Production Engineering Department, The Sirindhorn International Thai-German Graduate School of Engineering (TGGS), King Mongkut’s University of Technology North Bangkok, 1518 Pracharat 1 Road, Wongsawang, Bangsue, Bangkok, 10800, Thailand Department of Electronics Technology, Faculty of Electrical Engineering and Informatics, Budapest University of Technology and Economics, Muegyetem rkp. 3, Budapest, 1111, Hungary Department of Polymer Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Muegyetem rkp. 3, Budapest, 1111, Hungary Cited By :2 Export Date: 9 September 2020 CODEN: JTACF Correspondence Address: Karger-Kocsis, J.; Department of Polymer Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Muegyetem rkp. 3, Hungary; email: karger@pt.bme.hu Funding Agency and Grant Number: Thailand Research Fund through the Royal Golden Jubilee PhD ProgramThailand Research Fund (TRF) [PHD/0188/2557]; King Mongkut's University of Technology North Bangkok [KMUTNB-61-KNOW-002] Funding text: This research was supported by the Thailand Research Fund through the Royal Golden Jubilee PhD Program (Grant No. PHD/0188/2557 to J.T. and S.C.) and by the King Mongkut's University of Technology North Bangkok (Grant No. KMUTNB-61-KNOW-002). Production Engineering Department, The Sirindhorn International Thai-German Graduate School of Engineering (TGGS), King Mongkut’s University of Technology North Bangkok, 1518 Pracharat 1 Road, Wongsawang, Bangsue, Bangkok, 10800, Thailand Department of Electronics Technology, Faculty of Electrical Engineering and Informatics, Budapest University of Technology and Economics, Muegyetem rkp. 3, Budapest, 1111, Hungary Department of Polymer Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Muegyetem rkp. 3, Budapest, 1111, Hungary Cited By :3 Export Date: 18 March 2021 CODEN: JTACF Correspondence Address: Karger-Kocsis, J.; Department of Polymer Engineering, Muegyetem rkp. 3, Hungary; email: karger@pt.bme.hu Funding details: Thailand Research Fund, TRF, PHD/0188/2557 Funding details: King Mongkut's University of Technology North Bangkok, KMUTNB Funding text 1: Acknowledgements This research was supported by the Thailand Research Fund through the Royal Golden Jubilee PhD Program (Grant No. PHD/0188/2557 to J.T. and S.C.) and by the King Mon-gkut’s University of Technology North Bangkok (Grant No. KMUTNB-61-KNOW-002). Production Engineering Department, The Sirindhorn International Thai-German Graduate School of Engineering (TGGS), King Mongkut’s University of Technology North Bangkok, 1518 Pracharat 1 Road, Wongsawang, Bangsue, Bangkok, 10800, Thailand Department of Electronics Technology, Faculty of Electrical Engineering and Informatics, Budapest University of Technology and Economics, Muegyetem rkp. 3, Budapest, 1111, Hungary Department of Polymer Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Muegyetem rkp. 3, Budapest, 1111, Hungary Cited By :3 Export Date: 26 April 2021 CODEN: JTACF Correspondence Address: Karger-Kocsis, J.; Department of Polymer Engineering, Muegyetem rkp. 3, Hungary; email: karger@pt.bme.hu AB - Nd:YAG laser (355 nm) induced surface modifications in polylactic acid (PLA), and its composites with silver nanoparticles (AgNPs, size range between 120 and 150 nm) with and without additional melamine–formaldehyde-coated short sisal fibers were studied as a function of laser pulse numbers. The AgNP content was varied (100, 300 and 500 ppm), whereas the sisal content kept as constant (9 mass%). The PLA-based systems with a fully amorphous matrix were irradiated with 1–256 laser pulses at a constant fluence of 0.32 µJ µm−2. Changes in the irradiated surfaces were assessed and quantified by light and scanning electron microscopic pictures. Protrusion with bubbling, bubbled protrusion with cratering and crater formation with more or less bubbled ridges were found as characteristic ablation features. Bubbling was traced to entrapped gaseous products of PLA degradation, while the onset of ridges was ascribed to the melt flow of the PLA matrix caused by laser shock waves. The laser irradiation caused damage and ablation highly depended on the actual composition, which influenced the UV absorption at 355 nm, which was measured as well. © 2018 Akadémiai Kiadó, Budapest, Hungary LA - English DB - MTMT ER - TY - JOUR AU - Lakatos-Varsányi, M AU - Murányi, R AU - Hajdu, F AU - Berényi, Richárd AU - Varga, Lajos Károly TI - Nanostructured pulsed current metal coatings of Fe and Fe–Ni for microelectronic applications JF - TRANSACTIONS OF THE INSTITUTE OF METAL FINISHING J2 - T I MET FINISH VL - 95 PY - 2017 IS - 1 SP - 6 EP - 8 PG - 3 SN - 0020-2967 DO - 10.1080/00202967.2017.1256061 UR - https://m2.mtmt.hu/api/publication/3175704 ID - 3175704 LA - English DB - MTMT ER -