TY - JOUR A1 - Griepentrog, Michael A1 - Mackrodt, Brigitte A1 - Mark, G. A1 - Linz, T. T1 - Properties of TiN hard coatings prepared by unbalanced magnetron sputtering and cathodic arc deposition using a uni- and bipolar pulsed bias voltage N2 - TiN hard coatings have been prepared by unbalanced magnetron (UBM) sputtering and cathodic arc deposition using uni- and bipolar pulsed bias voltages. For UBM sputtering using a unipolar pulsed bias voltage the average substrate bulk temperature Ts was reduced to 220 °C without considerable loss of microhardness and adhesion by variation of the pulse parameters. Determination of the average energy Ep delivered to the growing film per deposited particle leads to values lower than the critical transition energy (150 eV atom-1) between open porous and dense coatings. Using a bipolar pulsed bias voltage Ts decreased with increasing duration ton+ of the positive bias pulse. It was found that Ep increased with increasing ton+ up to values found for d.c. bias voltage. The coatings prepared using a bipolar pulsed bias voltage at low Ts are dense and in compressive stress with acceptable microhardness and adhesion. First results of the investigation of TiN coatings prepared by cathodic arc deposition using unipolar pulsed bias are given. KW - Titan nitrid KW - Magnetron Zerstreuung KW - Kathodenbogen Ablagerung KW - Wechselvorspannung PY - 1995 U6 - https://doi.org/10.1016/0257-8972(95)08369-3 SN - 0257-8972 VL - 74-75 IS - 1 SP - 326 EP - 332 PB - Elsevier Science CY - Lausanne AN - OPUS4-625 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - van der Kolk, G. J. A1 - Hurkmans, A. A1 - Trinh, T. A1 - Fleischer, W. A1 - Beck, Uwe A1 - Griepentrog, Michael T1 - Coating evaluation of decorative PVD finishes T2 - 41st Annual Technical Conference CY - Boston, MA, USA DA - 1998-04-18 PY - 1998 UR - http://www.knovel.com/web/portal/browse/display?_EXT_KNOVEL_DISPLAY_bookid=272 SN - 1-591-24158-8 SP - 44 EP - 45 PB - Society of Vacuum Coaters CY - Albuquerque AN - OPUS4-607 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Beck, Uwe A1 - Reiners, Georg A1 - Griepentrog, Michael ED - Berg, S. T1 - Quality assessment, reliability and damage analysis of coating/substrate systems T2 - 7th International Conference on Plasma Surface Engineering (PSE 2000) CY - Garmisch-Partenkirchen, Germany DA - 2000-09-17 PY - 2000 SN - 0257-8972 IS - 142-144 PB - Elsevier CY - Amsterdam AN - OPUS4-972 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Griepentrog, Michael A1 - Dück, Alexander A1 - Wirth, Thomas T1 - PVD-Reference Layers for quantitative Analysis of N and C in steel and coatings by using electron and optical emission spectroscopy T2 - PSE 2000 CY - Garmisch-Partenkirchen, Germany DA - 2000-09-17 PY - 2000 AN - OPUS4-6142 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Österle, Werner A1 - Dück, Alexander A1 - Griepentrog, Michael A1 - Klaffke, Dieter T1 - Entwicklung und Charakterisierung von Mehrlagen-Schichtsystemen für die Trockenbearbeitung PY - 2001 SN - 0017-6583 SN - 0341-101X VL - 56 IS - 3 SP - 161 EP - 165 PB - Hanser CY - München AN - OPUS4-2369 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Österle, Werner A1 - Griepentrog, Michael A1 - Gross, Thomas A1 - Urban, Ingrid T1 - Chemical and microstructural changes induced by friction and wear of brakes N2 - The chemical and microstructural changes occurring during braking simulation tests at the surface of a conventional brake pad material were investigated mainly by scanning and transmission electron microscopy and surface analytical techniques. It can be shown that patches of a third body material develop, comprising a compositional mix of all constituents of the pad and iron oxides from the disk. Milled debris particles still have the crystal structure of barite, the major phase of the pad material, but the grain size is reduced drastically to the nanometer scale. The major wear mechanism is delamination of filler particles from the organic binder, supported by local degradation of the phenolic resin during asperity heating. Quartz crystals are preserved thereby adopting the function of primary contact areas. KW - Brake KW - Third body material KW - Friction layer KW - Electron microscopy PY - 2001 U6 - https://doi.org/10.1016/S0043-1648(01)00785-2 SN - 0043-1648 VL - 251 SP - 1469 EP - 1476 PB - Elsevier CY - Amsterdam AN - OPUS4-2371 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Dück, Alexander A1 - Gamer, Nadja A1 - Gesatzke, Wolfgang A1 - Griepentrog, Michael A1 - Österle, Werner A1 - Sahre, Mario A1 - Urban, Ingrid T1 - Ti/TiN multilayer coatings: deposition technique, characterization and mechanical properties N2 - Ti/TiN multilayer coatings with multilayer periods in the range 5–50 nm and a final thickness of 2 µm were deposited on steel substrates by cyclic modulation of nitrogen gas flow into the chamber of a PVD sputtering device. Coating characterization was performed by cross-sectional transmission electron microscopy, glancing-angle X-ray diffraction and instrumental indentation testing. Individual a-titanium and titanium nitride layers were always observed, although for the finer microstructures, the TiN layers were thicker than the Ti layers by a factor three. The plastic hardness of the films increased steadily with decreasing layer spacing, following a Hall–Petch relationship. Finally, a hardness value of 42 GPa was reached, which is similar to that of a thick TiN monolayer, prepared under the same coating conditions. KW - Ti/TiN KW - Multilayer KW - Magnetron sputtering KW - Mechanical properties KW - Cross-sectional transmission electron microscopy (XTEM) PY - 2001 U6 - https://doi.org/10.1016/S0257-8972(01)01171-9 SN - 0257-8972 VL - 142-144 SP - 579 EP - 584 PB - Elsevier Science CY - Lausanne AN - OPUS4-7646 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Reiners, Georg A1 - Griepentrog, Michael A1 - Gemmler, A. A1 - Schwart, S. A1 - Fetzer, H.-J. A1 - Schiffmann, K. A1 - Petrik, M. T1 - Strukturierung und Kommunikation von schichttechnischem Wissen - Chancen und Möglichkeiten des Informationssystems INO PY - 2002 SN - 0016-4232 VL - 1 SP - 136 EP - 142 PB - Leuze CY - Saulgau, Württ. AN - OPUS4-1737 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Griepentrog, Michael A1 - Ullner, Christian A1 - Dück, Alexander T1 - Instrumented indentation test for hardness and materials parameter from millinewtons to kilonewtons N2 - The ISO/DIS 14577 Metallic materials - Instrumented indentation test for hardness and materials parameters – Part 1-3 (IIT) concerns test forces up to 30 kN. The paper reports on IIT at test forces ranging from 0.002 N to 1000 N on non – magnetizable steel X8 CrMnN 18- 18 (1.386) with well polished surface using Vickers indenter and four hardness machines of different design (Nano Indenter XP, Fischerscope H 100, Zwick Z005 with Universal hardness head and a laboratory four-column set up materials testing machine) according to the standard. Using mostly identical test parameters the results of the different machines are almost in good agreement. Estimated small differences are caused by the different uncertainties of the used machines and by different methods of mathematical analysis of the detected raw data. T2 - International Conference on Force, Mass, Torque, Hardness and Civil Engineering Metrology in the Age Globalization CY - Celle, Germany DA - 2002-09-24 PY - 2002 SN - 3-18-091685-0 SN - 0083-5560 N1 - Serientitel: VDI-Berichte – Series title: VDI-Berichte IS - 1685 SP - 105 EP - 111 PB - VDI-Verl. CY - Düsseldorf AN - OPUS4-1741 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Schiffmann, K. A1 - Petrik, M. A1 - Gemmler, A. A1 - Fetzer, H. A1 - Schwarz, S. A1 - Griepentrog, Michael A1 - Reiners, Georg T1 - INO - A WWW information system for innovative coatings and surface technology N2 - In the last years, a lot of research work has been performed in the field of surface coatings and thin films technology, often supported by governmental research programs, as i.e. in Germany, the ‘Thin Film Technology’ and ‘OSTec’ research programs. But up until now, there is still a lack in transfer of this large amount of knowledge created by research activities on to industrial application and commercialization. To overcome this problem, a new web based information system has been developed (http://www.schichttechnik.net), which in a first step will make the whole content of the German OSTec research program (approx. 180 research reports) of the last 10 years available. In further steps, data from products of coating suppliers and other research programs will be taken into account. The database contains the following sections: definition of the coating system, deposition equipment, deposition processes, application properties, test procedures and test equipment, information about standardization and base information about coating processes etc. It will be possible to search for coatings by material properties and functions of coatings, considering also restriction on the substrate. In addition, searching regarding combination of properties, e.g. for wear-resistant, conductive, decorative coatings etc. will also be possible. T2 - Plasma Surface Engineering 2002 CY - Garmisch-Partenkirchen, Deutschland DA - 2002-09-14 PY - 2002 U6 - https://doi.org/10.1016/S0257-8972(01)01669-3 SN - 0257-8972 VL - 153 IS - 2-3 SP - 217 EP - 224 PB - Elsevier Science CY - Lausanne AN - OPUS4-2281 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -