New Material Concepts for Thermally Sprayed Hydrodynamic Bearings

  • K. Bobzin
  • M. Öte
  • T. Königstein
  • W. WiethegerEmail author
  • T. Schröder
  • G. Jacobs
  • D. Bosse


Hydrodynamic bearings have to fulfill different requirements, depending on the operating conditions. Yet, conventional hydrodynamic bearings could not be used in critical operating conditions such as permanent start/stop operations. This is the reason why rolling bearings are currently used for frequent starting operations and low circumferential velocities, as they occur in wind turbines. In order to operate hydrodynamic bearings in a fail-safe manner even under these increased requirements, new bearing materials are needed. Within this study, two new bearing material concepts are developed and deposited by thermal spraying as coatings to interact in this tribological system. On the one hand, matrix materials containing friction-reducing solid lubricants and on the other hand, multilayer systems, which can be used in as-sprayed condition, are investigated. The aim of both concepts is to improve the operation properties under critical conditions. The coating concepts are therefore tested on a modified high-load ring-on-disk tribometer and are compared to a reference plain bearing material produced by conventional casting. In this way, it is shown whether these new concepts can meet the requirements of slow-moving and highly loaded hydrodynamic bearings.


bearing multilayer solid lubricant tribology wind energy 



The presented investigations are part of the joint project “Thermally sprayed coatings of journal main bearing in wind turbines—Wind turbine drivetrain and surface engineering—WEA-GLiTS” promoted by the German Federal Ministry for education and research in the range of the program “Energy and climate fund” (Grant ID 03EK3036A). The authors would like to thank the German Federal Ministry of Research and Education for funding the “WEA-GLiTS” project. In addition, the authors would like to thank their project partners in industries Oerlikon Metco (Wohlen, Switzerland), Zollern BHW (Braunschweig, Germany) and Miba (Laakirchen, Austria) for the excellent cooperation and support. The tested feedstock materials were kindly provided by Oerlikon Metco, and the hexagonal boron nitride from Momentive Performance Materials (Albany, USA) was made available by the distributor Grolman Group (Neuss, Germany).


  1. 1.
    T. Mang, K. Bobzin, and T. Bartels, Industrial Tribology: Tribosystems, Friction, Wear and Surface Engineering, Lubrication, Wiley, Hoboken, 2011, p 204-206, ISBN 978-3-527-32057-8Google Scholar
  2. 2.
    K. Bobzin, M. Öte, T. Königstein, L. Zhao, and W. Wietheger, Thermal Spray Coatings in ASM Handbook, Friction, Lubrication, and Wear Technology, G.E. Totten, Ed., Materials Park, Ohio, 2017, p 614-619 ISBN 978-1-62708-141-2Google Scholar
  3. 3.
    K. Bobzin, F. Ernst, J. Zwick et al., Coating Bores of Light Metal Engine Blocks with a Nanocomposite Material Using the Plasma Transferred Wire Arc Thermal Spray Process, J. Therm. Spray Technol., 2008, 17(3), p 344-351. CrossRefGoogle Scholar
  4. 4.
    K. Bobzin, et al., Thermally Sprayed Hydrodynamic Main Bearings for Wind Turbines. in Conference proceedings international thermal spray conference and exposition, ITSC 2017 (Düsseldorf, Germany, 2017), p. 364-369, ISBN: 978-3-96144-000-9Google Scholar
  5. 5.
    T. Marrocco, L.S. Driver, S.J. Harris, and D.G. McCartney, Microstructure and Properties of Thermally Sprayed Al-Sn-Based Alloys for Plain Bearing Applications. J. Therm. Spray Technol., 2008, 15, p. 634-639, ISBN: 978-0-87170-836-6Google Scholar
  6. 6.
    T. Schröder, G. Jacobs, D. Bosse, K. Bobzin, M. Öte, T. Königstein, and W. Wietheger, Thermisch gespritzte Gleitlagerwerkstoffe für die Rotorlagerung von Windenergieanlagen. Ingenieurspiegel, 2016, 4, p. 28-29, ISSN: 1868-5919Google Scholar
  7. 7.
    D. Witter, G. Jacobs, R. Schelenz, and I. Weiser, Hydrodynamic Plain Bearings in a Main Gearbox of a 6 MW Wind Turbine, in 3rd conference for wind power drives, (Aachen, Germany, 2017), p. 35-47, ISBN: 978-3-74313-456-0Google Scholar
  8. 8.
    F. Gutiérrez Guzmána, M. Oezel, G. Jacobs, G. Burghardt, C. Broeckmann, and T. Janitzky, Reproduction of White Etching Cracks Under Rolling Contact Loading on Thrust Bearing and Two-Disc Test Rigs, Wear, 2017, CrossRefGoogle Scholar
  9. 9.
    W.A. Glaeser, Material for Tribology, Vol 20, Elsevier, Amsterdam, 1992, p 72ISBN 0-444-88495-5Google Scholar
  10. 10.
    G. Jacobs, T. Schröder, D. Witter, and C. Sous, Plain bearings in wind turbines, in 6th World Tribology Congress, WTC 2017 (Beijing, China, 2017)Google Scholar
  11. 11.
    L. Deters, A. Fischer, and E. Santner, Worksheet 7: Tribologie, (GfT e.V., Society for Tribology, Aachen, 2002), p. 33-40Google Scholar
  12. 12.
    VDI (Association of German Engineers): Guideline 2204 Part 1: Design of plain bearings, Basic instructions, 1992Google Scholar
  13. 13.
    E.J. Abbott and F.A. Firestone, Specifying Surface Quality—A Method Based on Accurate Measurement and Comparison, ASME Journal of Mechanical Engineering, 1933, 55, p 569-773Google Scholar

Copyright information

© ASM International 2019

Authors and Affiliations

  • K. Bobzin
    • 1
  • M. Öte
    • 1
  • T. Königstein
    • 1
  • W. Wietheger
    • 1
    Email author
  • T. Schröder
    • 2
  • G. Jacobs
    • 2
  • D. Bosse
    • 2
  1. 1.Surface Engineering Institute (IOT)RWTH Aachen UniversityAachenGermany
  2. 2.Center for Wind Power Drives (CWD)RWTH Aachen UniversityAachenGermany

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