Fatigue behaviour of Plasma Sprayed Titania and Chromia Coatings

Koutsomichalis, Angelos; Lontos, A.; Loukas, George; Vardavoulias, M.; Vaxevanidis, Nikolaos M.

doi:10.1051/matecconf/202134902009

Cited by 2 publications

(2 citation statements)

References 23 publications

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“…Afterwards, 350 µm chromia and 100 µm titania coating were deposited by an APS gun (FST SG-100, 80 kW) fitted to a KUKA robotic arm. The spraying conditions selected based on previous research [16] are the following. For the deposition of chromia coatings, the voltage was 37.5 V, the current 600 A, the argon pressure 120 psi, the hydrogen pressure 11 psi, the spraying distance was set at 100 mm, the spraying rate was 450 mm/s and a step of 5 mm was selected.…”

Section: Experimental Partmentioning

confidence: 99%

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Tribological performance of thermal sprayed coatings under abrasive conditions

Georgiou¹,

Koutsomichalis²,

Drees³

et al. 2023

tribomat

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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.

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Section: Experimental Partmentioning

confidence: 99%

“…(a) chromia coating and (b) titania coating (reprinted from Koutsomichalis et al [16], licensed under CC BY 4.0)…”

Section: Figure 2 Cross-section Images Of As-sprayedmentioning

confidence: 99%

Tribological performance of thermal sprayed coatings under abrasive conditions

Georgiou¹,

Koutsomichalis²,

Drees³

et al. 2023

tribomat

View full text Add to dashboard Cite

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Friction and Wear Behavior of 3D-Printed Inconel 718 Alloy under Dry Sliding Conditions

Karagiannidis,

Tzanis,

Drees

et al. 2024

Coatings

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Tailor-made materials used for advanced applications are nowadays of great research interest in various industrial and technological fields, ranging from aerospace and automotive applications to consumer goods and biomedical components. In the present research, Inconel 718 superalloy specimens were fabricated by the selective laser melting (SLM) technique. Structural characterization of the 3D-printed samples showed that they consisted of γ solid solution along with spherical carbide particles. To explore the applicability of these materials in abrasive tribological applications, reciprocating sliding tests were performed under dry conditions versus an Al2O3 counter-body. A 3D representation (triboscopy) of the tangential force during each sliding cycle was carried out in order to obtain better insight on the evolution of friction and to visualize localized tribological phenomena. Quantification of wear was performed with confocal microscopy and the wear mechanisms were analyzed with SEM and EDS techniques. Furthermore, the effect of surface finishing (as-printed and polished) on friction and wear were also investigated, and a comparison with other industrial materials is also included to evaluate the applicability of these alloys. The results indicated that surface finishing had an effect on friction during the run-in stage, whereas in steady-state conditions, no significant differences were observed between the as-printed and polished specimens. In all cases, the main wear mechanisms observed were a mixture of two-body and three-body abrasion, along with oxidative wear (indicated by the formation of an oxide-based tribo-layer).

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Fatigue behaviour of Plasma Sprayed Titania and Chromia Coatings

Cited by 2 publications

References 23 publications

Tribological performance of thermal sprayed coatings under abrasive conditions

Tribological performance of thermal sprayed coatings under abrasive conditions

Friction and Wear Behavior of 3D-Printed Inconel 718 Alloy under Dry Sliding Conditions

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