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Sliding and Rolling Wear Behavior of HVOF-Sprayed Coatings Derived from Conventional, Fine and Nanostructured WC-12Co Powders

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Abstract

Fine structured and nanostructured materials represent a promising class of feedstock for future applications, which has also attracted increasing interest in the thermal spray technology. Within the field of wear protection, the application of fine structured or nanostructured WC-Co powders in the High Velocity Oxy-Fuel flame spraying technique (HVOF) provides novel possibilities for the manufacturing of cermet coatings with improved mechanical and tribological characteristics. In this study the tribological behavior of HVOF sprayed coatings derived from conventional, fine and nanostructured WC-12Co powders under sliding and rolling wear are investigated and the results are compared to C45 steel (Mat.-No. 1.0503). In addition, sliding and rolling wear effects on a microscopic level are scrutinized. It has been shown that under optimized spray conditions the corresponding fine and nanostructured WC-12Co coatings are able to obtain higher wear resistances and lower friction coefficients than the conventional coatings. This can be attributed to several scaling effects of the microstructure and to the phase evolution of the coating, which are discussed.

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Acknowledgment

The authors gratefully acknowledge the financial support of the DFG (German Science Foundation) within the Collaborative Research Centre SFB 708, projects A2 and C2.

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Authors and Affiliations

  1. Institute of Materials Engineering, Faculty of Mechanical Engineering, Technische Universität Dortmund, Leonhard-Euler-Str. 2, 44227, Dortmund, Germany

    W. Tillmann, I. Baumann, P. S. Hollingsworth & L. Hagen

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  1. W. Tillmann
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  2. I. Baumann
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  3. P. S. Hollingsworth
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  4. L. Hagen
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Correspondence to W. Tillmann.

Additional information

This article is an invited paper selected from presentations at the 2013 International Thermal Spray Conference, held May 13-15, 2013, in Busan, South Korea, and has been expanded from the original presentation.

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Tillmann, W., Baumann, I., Hollingsworth, P.S. et al. Sliding and Rolling Wear Behavior of HVOF-Sprayed Coatings Derived from Conventional, Fine and Nanostructured WC-12Co Powders. J Therm Spray Tech 23, 262–280 (2014). https://doi.org/10.1007/s11666-013-0038-1

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