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In Situ Wear Test on Thermal Spray Coatings in a Large Chamber Scanning Electron Microscope

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Abstract

Currently, the determination of the mass loss is usually used for a quantitative evaluation of wear tests, while the analysis of wear tracks is utilized for a qualitative evaluation of wear. Both evaluation methods can only be used after the wear testing process and their results only present the final outcome of the wear test. However, the changes during the wear test and the time-dependent wear mechanisms are of great interest as well. A running wear test in a large chamber scanning electron microscope (SEM) offers the first opportunity to observe the wear process in situ. Different wear mechanisms, such as the adhesive, abrasive wear, surface fatigue and tribochemical reaction, can be recorded with high magnification. Within this research, a special pin-on-disk testing device is designed for a vacuum environment. Using this device, arc-sprayed NiCrBSi coatings and high-velocity-oxygen-fuel-sprayed WC-12Co coatings were tested in a large chamber SEM with Al2O3 ceramic balls as wear counterparts. During the wear testing, different wear mechanisms were determined and the processes were recorded in short video streams.

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Acknowledgments

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

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Authors and Affiliations

  1. Institute of Materials Engineering, TU Dortmund, Dortmund, Germany

    Weifeng Luo, Wolfgang Tillmann & Ursula Selvadurai

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  1. Weifeng Luo
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  2. Wolfgang Tillmann
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  3. Ursula Selvadurai
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Correspondence to Weifeng Luo.

Additional information

This article is an invited paper selected from presentations at the 2014 International Thermal Spray Conference, held May 21-23, 2014, in Barcelona, Spain, and has been expanded from the original presentation.

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Luo, W., Tillmann, W. & Selvadurai, U. In Situ Wear Test on Thermal Spray Coatings in a Large Chamber Scanning Electron Microscope. J Therm Spray Tech 24, 263–270 (2015). https://doi.org/10.1007/s11666-014-0163-5

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  • DOI: https://doi.org/10.1007/s11666-014-0163-5

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