Tribology and Materials | Volume 2 | Issue 1 | 2023 | 1-7
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https://doi.org/10.46793/tribomat.2023.003
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Tribological performance of thermal sprayed coatings under abrasive conditions
Emmanuel Georgiou
1,
Angelos Koutsomichalis1, Dirk Drees2,
Christos Panagopoulos3
1 Hellenic Air Force
Academy, Athens, Greece
2 Falex Tribology, Rotselaar, Belgium
3 National Technical University of Athens, Athens, Greece
Abstract: In this work, the tribological behaviour of thermally
sprayed titanium and chromium ceramic-based coatings was investigated
under abrasive conditions. Their structure was studied by a scanning
electron microscope (SEM), while their hardness was evaluated using a
microhardness tester. To study the strength of these ceramic coatings
under abrasion conditions, reciprocating sliding experiments were
carried out in a high-precision (10 mN resolution, 1000 Hz data
acquisition) pin-on-disk apparatus and by using a Ø6 mm corundum ball to
generate high contact pressures (1.5 GPa). To thoroughly investigate the
friction evolution of the tribo-system, three-dimensional mapping of the
tangential friction forces (triboscopy) was performed. Following the
abrasion experiments, the wear of these coatings was measured using
confocal microscopy. The obtained friction and wear results were
compared to state-of-the-art materials and coatings that are currently
being used in various industrial applications. From this comparison, it
was found that the titanium and chromium ceramic-based coatings have
comparable if not better tribological properties for the given
conditions. The main wear mechanism was mainly two-body abrasion due to
the surface roughness of the counter-material, as well as three-body
abrasion due to the formation of debris at the interface.
Keywords: thermal spraying, coatings, abrasion, wear,
friction, triboscopy.
Received: 16-02-2023, Revised: 16-03-2023, Accepted: 17-03-2023
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) license, which allows users to distribute, remix, adapt,
and build upon the material in any medium or format for non-commercial purposes only, and only so long as attribution is given to the creator.
2 Falex Tribology, Rotselaar, Belgium
3 National Technical University of Athens, Athens, Greece
Abstract: In this work, the tribological behaviour of thermally sprayed titanium and chromium ceramic-based coatings was investigated under abrasive conditions. Their structure was studied by a scanning electron microscope (SEM), while their hardness was evaluated using a microhardness tester. To study the strength of these ceramic coatings under abrasion conditions, reciprocating sliding experiments were carried out in a high-precision (10 mN resolution, 1000 Hz data acquisition) pin-on-disk apparatus and by using a Ø6 mm corundum ball to generate high contact pressures (1.5 GPa). To thoroughly investigate the friction evolution of the tribo-system, three-dimensional mapping of the tangential friction forces (triboscopy) was performed. Following the abrasion experiments, the wear of these coatings was measured using confocal microscopy. The obtained friction and wear results were compared to state-of-the-art materials and coatings that are currently being used in various industrial applications. From this comparison, it was found that the titanium and chromium ceramic-based coatings have comparable if not better tribological properties for the given conditions. The main wear mechanism was mainly two-body abrasion due to the surface roughness of the counter-material, as well as three-body abrasion due to the formation of debris at the interface.
Keywords: thermal spraying, coatings, abrasion, wear, friction, triboscopy.
Received: 16-02-2023, Revised: 16-03-2023, Accepted: 17-03-2023
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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) license, which allows users to distribute, remix, adapt, and build upon the material in any medium or format for non-commercial purposes only, and only so long as attribution is given to the creator.