TY - CONF A1 - Gradt, Thomas A1 - Schneider, Thomas A1 - Lingertat, J. A1 - Hathiramani, D. T1 - MoS2-Schmierung für hochbelastete Stützelemente zwischen supraleitenden Magnetspulen T2 - 49. Tribologie-Fachtagung - Reibung, Schmierung und Verschleiß - Forschung und praktische Anwendungen CY - Göttingen, Deutschland DA - 2008-09-22 KW - Tribologie KW - Molybdändisulfid KW - Stick-Slip KW - Supraleitung KW - Kernfusion PY - 2008 SN - 978-3-00-025676-9 VL - I SP - 13/1 EP - 13/10 AN - OPUS4-18366 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Gradt, Thomas A1 - Schneider, Thomas A1 - Lingertat, J. A1 - Hathiramani, D. A1 - Junghanns, P. A1 - Aßmus, Kristin A1 - Schauer, F. T1 - Cryogenic vacuum tests of scaled down narrow support elements for the W7-X coil system KW - Wendelstein 7-X KW - Magnet system KW - Narrow support elements KW - Friction KW - MoS2 PY - 2009 U6 - https://doi.org/10.1016/j.fusengdes.2008.11.075 SN - 0920-3796 VL - 84 IS - 2-6 SP - 840 EP - 843 PB - North-Holland Publ. Co. CY - Amsterdam AN - OPUS4-19662 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Lingertat, J. A1 - Gradt, Thomas A1 - Hathiramani, D. A1 - Junghanns, P. A1 - Laux, M. A1 - Meine, Kerstin A1 - Schauer, F. A1 - Schneider, Thomas T1 - Tribological performance of MoS2 coatings in liquid helium and at high loads N2 - The main part of a narrow support element (NSE) of the W7-X superconducting coil system is an aluminium bronze pad, PVD coated on its spherical surface with MoS2, which slides against the flat surface of the stainless steel coil housing, coated with MoS2 spray. The operational requirements of the NSEs are: vacuum of p < 10-6 mbar, temperature T ~4 K, maximum load P ~1500 kN, typical displacement ≤5 mm, smooth sliding and no stick-slip events. The paper describes test results obtained with a downscaled NSE at T = 4.2 and 77 K. During the test the NSEs were submerged in liquid helium and nitrogen, respectively. Whereas the LN2 test ran smoothly for up to ~15,000 cycles, the test in LHe showed stick-slip from the very first cycle. The stick-slip disappeared after ~50 cycles. Post mortem analysis of the tested parts revealed that in case of LHe the sprayed MoS2 film was removed during the first 30-100 cycles by blistering and flaking. The reason for the loss of adhesion at LHe temperature is not known, several possible causes are under discussion. Further experiments under vacuum and at T ~4 K are being prepared which are expected to help in clarifying the issue. KW - Stellarator KW - Wendelstein 7-X KW - Mechanical structure KW - Narrow support elements KW - MoS2 KW - Lubrication KW - T=4K PY - 2009 U6 - https://doi.org/10.1016/j.fusengdes.2009.01.069 SN - 0920-3796 VL - 84 IS - 7-11 SP - 1192 EP - 1196 PB - North-Holland Publ. Co. CY - Amsterdam AN - OPUS4-19745 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Gradt, Thomas A1 - Schneider, Thomas A1 - Lingertat, J. A1 - Hathiramani, D. A1 - Schauer, F. T1 - MoS2-Schmierung für hochbelastete Stützelemente zwischen supraleitenden Magnetspulen KW - Kernfusion KW - Supraleitende Magnete KW - Kryotribologie KW - Vakuumtribologie KW - Stick-Slip KW - MoS2 PY - 2009 SN - 0724-3472 VL - 56 IS - 5 SP - 24 EP - 28 PB - Expert Verlag CY - Renningen AN - OPUS4-20726 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -