TY - JOUR A1 - Theiler, Géraldine A1 - Gradt, Thomas T1 - Environmental effects on the sliding behaviour of PEEK composites N2 - The sliding performance of PEEK materials against steel discs was investigated in air, vacuum and hydrogen environment. KW - Sliding friction KW - PEEK KW - Graphite KW - TiO2 KW - CNTs KW - Vacuum KW - Hydrogen PY - 2016 DO - https://doi.org/10.1016/j.wear.2016.09.019 SN - 0043-1648 SN - 1873-2577 VL - 368 SP - 278 EP - 286 PB - Elsevier B.V. AN - OPUS4-37927 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Theiler, Geraldine A1 - Gradt, Thomas T1 - Einfluss von Wasserstoff auf das Gleitverhalten von graphitgefüllten Polymeren N2 - Die tribologischen Eigenschaften von graphitgefüllten Polyimiden gegen Stahl 100Cr6 wurden an Luft, im Hochvakuum (l0⁻ ³ Pa) und in Wasserstoffumgebung bei verschiedenen Drücken (10³ Pa, 10⁴ Pa und 10⁵ Pa) untersucht. Zwei unterschiedliche Polyimid-Typen wurden eingesetzt, wobei Typ und Menge des Graphits variiert wurden. Die Experimente wurden bei 3,1 MPa Kontaktdruck und einer Gleitgeschwindigkeit von 0,2 m/s bzw. 1 m/s durchgeführt. Die verschlissenen Oberflächen und die Morphologie des Materialübertrags auf die Stahl-Gegenfläche wurden mittels Lichtmikroskopie, REM, TEM und FTIR untersucht. Die Untersuchung zeigt, dass sowohl die Matrix als auch der Graphitanteil einen deutlichen Einfluss auf das Reibverhalten von Verbundwerkstoffen in Wasserstoffumgehungen haben können. N2 - The tribological behaviour of graphite filled polyimide composites against steel (AISI 521 00) was investigated in air, vacuum and hydrogen environment at different pressures (10³ Pa, 10⁴ Pa, and 10⁵ Pa). Composites consist of two polyimides filled with different types and amount of graphite. Friction and wear measurements were performed at 0.2m/s and 3.1MPa at ambient temperature. Wom surfaces and morphology of the material transfer on the steel counter-face were investigated by optical microscopy, SEM, TEM and FTIR analyses. Results reveal that both the polyimide structure and graphite can have an important influence on the friction behaviour of composites in hydrogen environment. KW - Polymere KW - Verbundwerkstoffe KW - Graphit KW - Wasserstoff KW - Vakuum KW - Polymers KW - Composites KW - Graphite KW - Hydrogen KW - Vacuum PY - 2015 SN - 0724-3472 VL - 62 IS - 2 SP - 25 EP - 32 PB - Expert Verlag CY - Renningen AN - OPUS4-33557 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Theiler, Geraldine A1 - Gradt, Thomas T1 - Einfluss von Wasserstoff auf das Gleitverhalten von graphitgefüllten Polymeren T2 - 55. Tribologie-Fachtagung - Reibung, Schmierung und Verschleiß - Forschung und praktische Anwendungen CY - Göttingen, Germany DA - 2014-09-22 PY - 2014 SN - 978-3-00-046545-1 VL - II SP - 35/1 EP - 35/11 AN - OPUS4-31530 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Hübner, Wolfgang A1 - Theiler, Geraldine A1 - Gradt, Thomas A1 - Klein, P. A1 - Friedrich, K. T1 - Der Einfluss kryogener Medien auf den Materialtransfer im Tribosystem Polymerkomposit/Stahl PY - 2001 SN - 0724-3472 VL - 48 IS - 6 SP - 8 EP - 12 PB - Expert Verlag CY - Renningen AN - OPUS4-12659 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Theiler, Géraldine A1 - Gradt, Thomas T1 - Comparison of the sliding behavior of several polymers in gaseous and liquid hydrogen N2 - The development of hydrogen technologies entails high safety requirements in distribution and dispensing infrastructure. Therefore, it is necessary to pursue research on material compatibility in hydrogen, especially for critical parts with tribological issues. The focus of this study is to evaluate the influence of hydrogen on a wider range of commercially available polymer materials. Thereby, the friction and wear behavior of different grades of TPE, POM, PA66, PA12, PPA, PEEK, PPS, PTFE, PAI, PI and PBI were investigated against a rotating steel disk (AISI 304). Filled and unfilled polymers from different suppliers were evaluated at room temperature in air, vacuum and hydrogen gas (H2) as well as in liquid hydrogen at - 253°C (LH2). The sliding behavior of the polymer materials is discussed by means of surface analyses, whereby special attention is paid to the formation of a transfer film. According to the results at ambient temperature, the effect of hydrogen environment on the tribological behavior of neat polymers may be related to lack of moisture, but also to saturated hydrocarbons in gaseous hydrogen. In liquid hydrogen, the best tribological performances were achieved with neat PA polymers as well as PPS and PI composites. KW - Polymers KW - Composites KW - Sliding wear KW - Hydrogen KW - Cryogenic temperature PY - 2023 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-597123 DO - https://doi.org/10.2474/trol.18.217 SN - 1881-2198 VL - 18 IS - 5 SP - 217 EP - 231 PB - Japanese Society of Tribologists AN - OPUS4-59712 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Theiler, Géraldine A1 - Gradt, Thomas T1 - Benchmarking of polymer materials for tribological applications in hydrogen N2 - The focus of this study is to evaluate the influence of hydrogen on the friction and wear behavior of a wide range of polymer materials. Thereby, the tribological performance of filled und unfilled polymers from different suppliers were compared at room temperature in air and hydrogen gas (H2) as well as in liquid hydrogen at -235°C (LH2). T2 - 23rd International Conference on Wear of Materials CY - Online meeting DA - 26.04.2021 KW - Polymers KW - Hydrogen KW - Friction KW - Wear PY - 2021 AN - OPUS4-52651 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -