TY - JOUR A1 - Amrhein, Frank A1 - Bochtler, Ulrich A1 - Hellmann, Ralf A1 - Kaloudis, Michael A1 - Kaloumenos, Mareiki T1 - Vergleich der thermischen Eigenschaften unterschiedlicher insulated metal substrat-Leiterplatten JF - PLUS, Leiterplattentechnik KW - Gedruckte Schaltung KW - Trägersubstanz Y1 - 2010 IS - 8 SP - 1758 PB - Hanser Verlag CY - München ER - TY - JOUR A1 - Sahl, Martin A1 - Kaloudis, Michael T1 - Einsatz von Glasloten zur Erzeugung gasdichter Fügestellen beim Aufbau von Drucksensoren JF - PLUS KW - Drucksensor KW - Glaslot Y1 - 2010 IS - 12 SP - 1367 PB - Leuze-Verlag CY - Bad Saulgau ER - TY - JOUR A1 - Schneider, Johannes A1 - Bochtler, Ulrich A1 - Hellmann, Ralf A1 - Kaloudis, Michael A1 - Gockel, Tilo T1 - LUVLED III – Optimierung eines Kühlkonzeptes zur Aktivluftkühlung eines Hochleistungs-UV-LED-Moduls JF - Zeitschrift ELEKTOR, Sonderheft LED-Special 4 – Leuchtdioden in Theorie und Praxis, 2012 KW - UV-LED Modul KW - Lumineszenzdiode Y1 - 2012 IS - 9 SP - 20 EP - 29 ER - TY - JOUR A1 - Rauer, Miriam A1 - Kaloudis, Michael T1 - Hinter der Fassade - Ausfallanalyse an einem Lithium-Ionen Akkumulator mittels CT JF - QZ Qualität und Zuverlässigkeit KW - Ausfallanalyse KW - Lithium-Ionen-Akkumulator KW - Ausfallanalyse Y1 - 2013 VL - 2013 IS - 1 SP - 40 EP - 41 ER - TY - JOUR A1 - Rauer, Miriam A1 - Schreck, Timo A1 - Kaloudis, Michael T1 - X-Ray Computed Tomography as Supporting Technology in the Failure Analysis of Press-In Connections for Electronic Assemblies JF - Practical Metallography KW - X-ray KW - Fehleranalyse KW - Computertomografie KW - Elektronische Baugruppe Y1 - 2013 VL - 50(2013) IS - 3 SP - 205 EP - 221 ER - TY - JOUR A1 - Bochtler, Ulrich A1 - Hellmann, Ralf A1 - Kaloudis, Michael T1 - Neuartige UV-Lichtquelle auf Leuchtdiodenbasis, Packaging und Hybridschaltungen JF - PLUS KW - Lumineszenzdiode Y1 - 2010 IS - 2 PB - Leuze-Verlag ER - TY - JOUR A1 - Braunwarth, Louisa A1 - Amrhein, Sebastian A1 - Schreck, Timo A1 - Kaloudis, Michael ED - Huisingh, Donald T1 - Ecological comparison of soldering and sintering as die-attach technologies in power electronics JF - Journal of Cleaner Production N2 - In this study the method of life cycle assessment is used to perform a comparison of two die-attach technologies of power modules: silver sintering and common soldering with a tin–silver–copper solder. The goal of the study is to indicate which die-attach technique is more environmentally friendly. This is important in order to design future electronics more environmentally friendly. Processing covers the manufacturing of the respective pastes, application of pastes, and mounting as well as the subsequent sintering or soldering, including cleaning of the soldered parts. The last step in the processing is a wire bonding process. The environmental impacts are expressed in CO2-equivalents and ReCiPe points and different variants are discussed: comparisons are made between considered pastes and between a soldered and a sintered power module, including consideration of lifetime. Concerning sintering, the influence of using recycled silver is analyzed more closely. The types of stages included in this life cycle assessment best fit a cradle-to-gate assessment, because usage, recycling, and disposal are not included. The software used is OpenLCA version 1.3.3, created by GreenDelta, and the database used is Ecoinvent version 2.2. In order to fill data gaps, electronics manufacturing companies were contacted, and our own calculations and measurements were applied. The consideration of the wet film thicknesses of the soldering system and sintering system, respectively, results in very similar CO2-equivalent emissions for sinter paste and solder paste. Comparing the soldered power module to the sintered one shows minor to significant differences between the two systems which could easily be changed when changing circumstances and assumptions. But when considering the respective lifetimes of the joining technologies, sintering technology is clearly preferable to the conventional soldering technology. Using solely recycled silver for manufacturing of silver sinter paste reduces the CO2-equivalent emissions of one sintered power module by roughly 40%. The results clearly show the dependence of outcomes on the initial settings. Consideration of lifetime has an enormous impact on the comparison of soldering technology to sintering technology. But the benefit of this life extension through the use of sintering technology is only useful when a long lifetime is required. KW - Life cycle assessment; Solder; Sinter; Die-attach; Power electronics; Environment KW - Löten KW - Sintern KW - Leistungselektronik Y1 - 2015 VL - 23 IS - 102 SP - 408 EP - 417 ER - TY - JOUR A1 - Rauer, Miriam A1 - Kaloudis, Michael T1 - Ausfallanalyse an einem Lithium-Ionen Akkumulator JF - Maschinenmarkt KW - Lithium-Ionen-Akkumulator Y1 - 2014 VL - 2014 IS - 2 SP - 45 EP - 46 ER - TY - JOUR A1 - Rauer, Miriam A1 - Kaloudis, Michael T1 - Computertomographie erweitert das Blickfeld JF - Mikroproduktion KW - Computertomographie Y1 - 2014 VL - 2014 IS - 1 SP - 50 EP - 51 ER - TY - JOUR A1 - Dressler, Katharina A1 - Rauer, Miriam A1 - Kaloudis, Michael A1 - Dauwe, Stefan A1 - Herguth, Axel A1 - Hahn, Giso T1 - Nondestructive Characterization of Voids in Rear Local Contacts of PERC-Type Solar Cells JF - IEEE Journal of Photovoltaics N2 - In this paper, we present two nondestructive characterization methods for the detection of voids in rear local contacts of passivated emitter and rear-type solar cells, namely scanning acoustic microscopy and computer tomography. We compare both methods and include a comparison with electroluminescence measurements. It is shown in this paper that voids can easily be detected with both measurement types without any sample preparation. We found a good match of scanning acoustic microscopy (SAM) and computer tomography (CT), which is presented for this purpose for the first time. The investigation was carried out for different aluminum pastes. KW - Solarzelle Y1 - 2014 U6 - https://doi.org/10.1109/JPHOTOV.2014.2359745 VL - 2015 IS - 1 SP - 70 EP - 76 ER - TY - JOUR A1 - Rauer, Miriam A1 - Volkert, Antje A1 - Härter, Stefan A1 - Schreck, Timo A1 - Kaloudis, Michael ED - Stevenson, Michael T1 - Computed-Tomography-Based Analysis of Voids in SnBi57Ag1 Solder Joints and Their Influence on the Reliability JF - Journal of Failure Analysis and Prevention KW - Computertomographie KW - Löten Y1 - 2014 VL - 14 IS - 3 SP - 272 EP - 281 ER - TY - CHAP A1 - Rauer, Miriam A1 - Schreck, Timo A1 - Härter, Stefan A1 - Kaloudis, Michael T1 - The Effect of Thermal Stress on the Reliability of low Ag Solder Joints in High Power LEDs T2 - 20th European Microelectronics and Packaging Conference (EMPC) & Exhibition, 14.-16.09.2015 KW - Lumineszenzdiode KW - Thermische Belastung KW - Zuverlässigkeit KW - Lötverbindung Y1 - 2015 SP - 1 EP - 6 ER - TY - CHAP A1 - Rauer, Miriam A1 - Xu, Ping A1 - Reinhardt, Andreas A1 - Kaloudis, Michael A1 - Franke, Jörg T1 - Einfluss von Poren in Lötverbindungen bei LED-Anwendungen T2 - Elektronische Baugruppen und Leiterplatten – EBL 2016 KW - Lötverbindung KW - Lumineszenzdiode KW - Pore Y1 - 2016 SN - 978-3-8007-4147-2 SP - 135 EP - 139 PB - VDE Verlag CY - Berlin ER - TY - JOUR A1 - Amrhein, Sebastian A1 - Schneider, Mareike A1 - Kaloudis, Michael T1 - Ein zweites Leben für den Akku JF - ReSource KW - Lithium-Ionen-Akkumulator KW - Elektrofahrrad Y1 - 2016 VL - 2016 IS - 1 SP - 10 EP - 16 ER - TY - JOUR A1 - Bachmann, Marco A1 - Amrhein, Sebastian A1 - Kaloudis, Michael T1 - Intelligente Pedelecs fördern. Ein Ansatz zur nachhaltigen Verbesserung unseres Mobilitätsverhaltens JF - Internationales Verkehrswesen KW - Pedelec Y1 - 2016 VL - 2016 IS - 1 SP - 16 EP - 19 ER - TY - CHAP A1 - Schwarzer, Christian A1 - Chew, Ly May A1 - Schnepf, Michael A1 - Stoll, Thomas A1 - Franke, Jörg A1 - Kaloudis, Michael T1 - INVESTIGATION OF COPPER SINTER MATERIAL FOR DIE ATTACH T2 - SMTA International Conference Proceedings KW - Leistungshalbleiter KW - Leistungselektronik KW - Kupfer KW - Sintern Y1 - 2018 VL - 2018 IS - Proceedings SMTAI 2018 CY - Rosemont ER - TY - CHAP A1 - Hensel, Alexander A1 - Schwarzer, Christian A1 - Scheetz, Matthias A1 - Kaloudis, Michael A1 - Franke, Jörg T1 - Investigations of Silver Sintered Interconnections 3-Dimensional Ceramics with Plasma Based Additive Copper Metallizations T2 - 2018 IEEE 20th Electronics Packaging Technology Conference (EPTC) KW - Leistungselektronik KW - Hochtemperatur KW - Sintern Y1 - 2018 U6 - https://doi.org/10.1109/EPTC.2018.8654421 VL - 2018 SP - 416 EP - 421 CY - Singapore ER - TY - CHAP A1 - Schmitt, Wolfgang A1 - Schnepf, Michael A1 - Franke, Jörg A1 - Kaloudis, Michael T1 - Investigation of a Sintering Process for Micro-Scale Copper Material T2 - 2019 SMTA Electronic in Harsh Environments Conference KW - Kupfer KW - Sintern Y1 - 2019 VL - 2019 ER - TY - CHAP A1 - Stenzel, David A1 - Schwarzer, Christian A1 - Schnepf, Michael A1 - Schmitt, Wolfgang A1 - Blank, Thomas A1 - Franke, Jörg A1 - Kaloudis, Michael T1 - Characterization of Alternative Sinter Materials for Power Electronics T2 - 22nd Microelectronics and Packaging Conference (EMPC) & Exhibition, 16 Sep 2019 - 19 Sep 2019, Conference Center PISA, Italy KW - Sintern, Silber, Kupfer KW - Leistungselektronik KW - Sintern Y1 - 2019 ER - TY - CHAP A1 - Sauer, Theresia A1 - Kefer, Stefan A1 - Ruppert, Wolfgang A1 - Hellmann, Ralf A1 - Kaloudis, Michael T1 - Integration of Bragg grating sensors in components made of carbon fiber reinforced polymers T2 - Tagungsband der 20. GMA/ITG-Fachtagung Sensoren und Messsysteme 2019, 25.06.2019 - 26.06.2019, Nürnberg, Deutschland N2 - This contribution discusses the integration of polymer planar Bragg grating sensors (PPBG) into carbon fiber reinforced polymer (CFRP) components. For the first time, it is shown that PPBGs based on cyclic olefin copolymers can be integrated into commercial-grade composites, thereby withstanding the demanding production processes. Pre-impregnated fibers are stacked and partially modified to form a sensor pocket. Afterwards, the CFRP specimen containing the optical sensor is cured in a heated mechanical press for 2 hours at a pressure of 7 bar and a temperature of 120 °C. A subsequent evalutaion of the sensor signal shows a Bragg wavelength shift of 1236 pm and a decline in signal amplitude of -2 dB. Three-point flexural tests of the cured sample reveal a linear behavior of the sensor signal towards external loads. The determined sensitivity in dependence of the CFRP specimen's maximum central deflection is -112 pm/mm, while correlation to the applied force results in a sensitivity of -5 pm/N. KW - Bragg grating sensors KW - carbon fiber reinforced polymers KW - cyclic olefin copolymers KW - structural health monitoring KW - Bragg-Reflektor Y1 - 2019 SN - 978-3-9819376-0-2 U6 - https://doi.org/10.5162/sensoren2019/P3.12 SP - 806 EP - 810 ER -