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Thermally Sprayed SiC Coatings for Offshore Wind Turbine Bearing Applications

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Abstract

Tribological tests were conducted on thermally sprayed silicon carbide (SiC) coatings to investigate its potential on reducing wear in offshore wind turbine bearings. The tests were carried out under dry conditions, 3.5 wt.% NaCl solution, and polyalfaolefin (PAO)-lubricated conditions. In order to obtain good quality SiC coatings, it is compulsory to modify the feedstock to limit SiC decomposition during atmospheric spraying process. The SiC feedstock used in this research has been modified with yttrium aluminum garnet (Y3Al5O12) oxide additives that originated from its metal salt precursors. High-frequency pulse detonation (HFPD) technique has been utilized to produce coatings of around 100 μm in thickness. The sliding tests have recorded the lowest coefficient of friction (COF) of 0.15 in PAO condition and the highest COF of 0.50 in dry sliding. The wear tracks morphology show that during dry sliding test, the coatings experience abrasive wear accompanied by tribo-oxidation reaction that initiates crack formation along the splat boundaries. On the other two sliding test conditions (NaCl and PAO), polishing of asperities and some grain plowing from the splats were observed in the wear tracks. Tribochemical wear was found to be the main mechanism producing smooth surfaces. Nevertheless, in all cases, the wear losses were negligible.

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Acknowledgments

The authors would like to acknowledge the support of TSO Materialer, NTNU (Strategic Area of Materials, NTNU) for funding. Carlos Vaquero and Georgii Barykin (TECNALIA, Spain) are also thanked for helping and advising in the production of the coatings.

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Authors and Affiliations

  1. Tribology Lab, Department of Engineering Design and Materials, Norwegian University of Science and Technology, 7491, Trondheim, Norway

    F. Mubarok & N. Espallargas

  2. Tribology Lab, SINTEF Materials and Chemistry, 7465, Trondheim, Norway

    S. Armada

  3. TECNALIA, 20305, Irun, Spain

    I. Fagoaga

Authors
  1. F. Mubarok
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  2. S. Armada
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  3. I. Fagoaga
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  4. N. Espallargas
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Corresponding author

Correspondence to F. Mubarok.

Additional information

This article is an invited paper selected from presentations at the 5th Asian Thermal Spray Conference (ATSC 2012) and has been expanded from the original presentation. ATSC 2012 was held at the Tsukuba International Congress Center, Ibaraki, Japan, November 26-28, 2012, and was organized by the Japan Thermal Spray Society and the Asian Thermal Spray Society.

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Mubarok, F., Armada, S., Fagoaga, I. et al. Thermally Sprayed SiC Coatings for Offshore Wind Turbine Bearing Applications. J Therm Spray Tech 22, 1303–1309 (2013). https://doi.org/10.1007/s11666-013-9991-y

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  • DOI: https://doi.org/10.1007/s11666-013-9991-y

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