TY - JOUR A1 - Gradt, Thomas A1 - Aßmus, Kristin A1 - Börner, Helmut A1 - Schneider, Thomas T1 - Apparatus for friction tests of support elements in fusion devices N2 - Spacers and supports belong to the critical elements in the structure of a nuclear fusion device, particularly, when they are installed in the vacuum or superconducting magnet system of the reactor. These supports have to sustain high loads while allowing a certain amount of tangential movement with low friction and without any stick-slip motion. Vacuum and cryogenic environments are extremely hostile for smooth sliding systems, because conventional liquid lubricants cannot be employed, and only a very limited number of materials for dry sliding systems under these conditions are available. In order to test the friction behaviour of support elements in the field coils of the fusion experiment WENDELSTEIN 7-X, a test rig was build which allows testing in liquid helium environment at 4.2 K, with a normal force up to 150 kN, and a sliding velocity of 0.1 mm/s in oscillating motion. First tests have shown that the apparatus is appropriate for simulating the sliding behaviour of support elements. As an example, a result of an earlier model test of an MoS2-coating is shown. KW - Tribologie KW - Vakuum KW - Kernfusion KW - Festschmierstoffe PY - 2008 DO - https://doi.org/10.1088/1742-6596/100/6/062032 SN - 1742-6588 SN - 1742-6596 VL - 100 IS - 062032 SP - 1 EP - 4 PB - IOP Publ. CY - Bristol, UK AN - OPUS4-17369 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Gradt, Thomas A1 - Börner, Helmut A1 - Hübner, Wolfgang T1 - Friction and Wear Testing for Cryogenic Engineering T2 - MAT 2001 ; International conference: material testing and research ; MAT Kongreß ; MAT Conference CY - Nuremberg, Germany DA - 2001-05-08 PY - 2001 IS - A5.5 SP - 129 EP - 133 PB - AMA Service GmbH CY - Wunstorf AN - OPUS4-1116 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Gradt, Thomas A1 - Börner, Helmut A1 - Hübner, Wolfgang T1 - Low temperature tribology at the federal institute for materials research and testing N2 - Friction systems running in cryogenic environment are critical in respect to wear and frictional heat generation because in this temperature range, conventional lubricants can't be applied. In order to test the friction and wear behaviour of appropriate solid lubricants and wear resistant material combinations in cryogenic environment, including liquid hydrogen, special test rigs have been constructed. These devices provide test conditions for tribological investigations at temperatures ranging from 4.2K to room temperature in liquid or gaseous environment at pressures between 10-3 mbar and 20 bar. Investigations on polymers, composites and metals with and without coatings show that there is a broad variety of appropriate materials for cryogenic friction units, but the behaviour of austenitic steels in such systems gives an example of non sufficient knowledge in this field. T2 - 9th ESMATS, European Space Mechanisms and Tribology Symposium CY - Liège, Belgium DA - 2001-09-19 PY - 2001 UR - http://adsabs.harvard.edu/abs/2001ESASP.480..317G SN - 92-9092-761-5 SN - 0379-6566 N1 - Serientitel: ESA SP – Series title: ESA SP IS - 480 SP - 317 EP - 320 PB - ESA Publ. Division CY - Noordwijk AN - OPUS4-1164 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Gradt, Thomas A1 - Börner, Helmut ED - Lehmann, J. T1 - Friction and Wear Testing in Liquid Hydrogen T2 - 4th HYPOTHESIS ; 4th International Symposium on Hydrogen Power - Theoretical and Engineering Solutions CY - Stralsund, Germany DA - 2001-09-09 KW - Tribology KW - Cryogenic engineering KW - Hydrogen environment KW - Test equipment KW - Steels PY - 2001 SN - 3-9807963-0-2 VL - 2 SP - 388 EP - 392 PB - Fachhochsch. CY - Stralsund AN - OPUS4-1165 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Gradt, Thomas A1 - Börner, Helmut A1 - Hübner, Wolfgang A1 - Ostrovskaya, Y. T1 - Friction and wear testing in cryogenic environment T2 - 3ème Colloque Européen sur la Technologie des Lanceurs ; 3rd European Conference on Launcher Technology CY - Strasbourg, France DA - 2001-12-11 PY - 2001 SP - 927 EP - 935 PB - CNES CY - Paris AN - OPUS4-1330 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -