New Material Concepts for Thermally Sprayed Hydrodynamic Bearings
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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.
Keywordsbearing 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).
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