Tribological performance at high temperatures of alumina coatings applied by plasma spraying process onto a refractory material

Franco, David Ángel Cendón; Ageorges, Hélène; López, Esperanza; Vargas, Fabio

doi:10.1016/j.surfcoat.2019.04.058

Cited by 21 publications

(9 citation statements)

References 31 publications

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“…AT13 and AT40 powders, beyond α-Al2O3, contained also peaks of rutile-TiO2 (AT13, AT40), tialite Al2TiO5 (AT13, AT40) and Al-rich solid solution Al2−xTi1+xO5 (AT40). Similar phase compositions of such powders were stated in the works of other authors [42,43]. Figure 9 presents phases identified in AT0, AT13 and AT40 powders, dedicated to suspension preparation.…”

Section: Micrometer-and Submicrometer-sized Powderssupporting

confidence: 79%

“…Moreover, the presence of α-Al 2 O 3 (50 vol.%) was caused by the incomplete melting of powders in the plasma jet, as confirmed by microstructural studies. In the literature, the content of the α-Al 2 O 3 phase in AT0 APS coatings is reported in a wide range, starting from 4 vol.% [53], 15 vol.% [42] up to 35 vol.% [54]. It is commonly agreed that the amount of preserved α-Al 2 O 3 phase is influenced both by the characteristics of the feedstock material as well as by the spray process parameters.…”

Section: Aps Coatingsmentioning

confidence: 99%

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A Study on the Microstructural Characterization and Phase Compositions of Thermally Sprayed Al2O3-TiO2 Coatings Obtained from Powders and Water-Based Suspensions

et al. 2020

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In this work, the alumina (Al2O3) and alumina-titania coatings with different contents of TiO2, i.e., Al2O3 + 13 wt.% TiO2 and Al2O3 + 40 wt.% TiO2, were studied. The coatings were produced by means of powder and liquid feedstock thermal spray processes, namely atmospheric plasma spraying (APS), suspension plasma spraying (SPS) and suspension high-velocity oxygen fuel spraying (S-HVOF). The aim of the study was to investigate the influence of spray feedstocks characteristics and spray processes on the coating morphology, microstructure and phase composition. The results revealed that the microstructural features were clearly related both to the spray processes and chemical composition of feedstocks. In terms of phase composition, in Al2O3 (AT0) and Al2O3 + 13 wt.% TiO2 (AT13) coatings, the decrease in α-Al2O3, which partially transformed into γ-Al2O3, was the dominant change. The increased content of TiO2 to 40 wt.% (AT40) involved also an increase in phases related to the binary system Al2O3-TiO2 (Al2TiO5 and Al2−xTi1+xO5). The obtained results confirmed that desired α-Al2O3 or α-Al2O3, together with rutile-TiO2 phases, may be preserved more easily in alumina-titania coatings sprayed by liquid feedstocks.

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Section: Micrometer-and Submicrometer-sized Powderssupporting

confidence: 79%

Section: Aps Coatingsmentioning

confidence: 99%

A Study on the Microstructural Characterization and Phase Compositions of Thermally Sprayed Al2O3-TiO2 Coatings Obtained from Powders and Water-Based Suspensions

et al. 2020

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“…This transformation is a result of the high temperature and the preferential nucleation of γ-Al 2 O 3 at high cooling rates [51]. For APS coating, the quantitative results (see Table 3) are similar to the ones in the literature [25,52]. On the other hand, for SPS coating, the content of γ-Al 2 O 3 was the lowest.…”

Section: Phase Composition Of Alumina Coatingssupporting

confidence: 78%

“…The compact tribofilm was formed. Following the findings of Bolelli et al [52], it can be claimed that the formation of a compact film visible at the edges of the wear track of A-SPS and S-HVOF supported the anti-wear alumina properties. Finally, it should be pointed out that the dense, tough, and uniform structure likewise manufactured by the A-SPS and S-HVOF processes, followed by the dense tribofilm formation, mitigated the adhesive wear mechanism of alumina coatings, and was beneficial for their tribological performance.…”

Section: Wear Behaviormentioning

confidence: 51%

Wear Behavior Analysis of Al2O3 Coatings Manufactured by APS and HVOF Spraying Processes Using Powder and Suspension Feedstocks

et al. 2021

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Thermally sprayed ceramic coatings are applied for the protection of surfaces that are exposed mainly to wear, high temperatures, and corrosion. In recent years, great interest has been garnered by spray processes with submicrometric and nanometric feedstock materials, due to the refinement of the structure and improved coating properties. This paper compares the microstructure and tribological properties of alumina coatings sprayed using conventional atmospheric plasma spraying (APS), and various methods that use finely grained suspension feedstocks, namely, suspension plasma spraying (SPS) and suspension high-velocity oxy-fuel spraying (S-HVOF). Furthermore, the suspension plasma-sprayed Al2O3 coatings have been deposited with radial (SPS) and axial (A-SPS) feedstock injection. The results showed that all suspension-based coatings demonstrated much better wear resistance than the powder-sprayed ones. S-HVOF and axial suspension plasma spraying (A-SPS) allowed for the deposition of the most dense and homogeneous coatings. Dense-structured coatings with low porosity (4 vol.%) and good cohesion to the metallic substrate, containing a high content of α–Al2O3 phase (56 vol.%) and a very low wear rate (0.2 ± 0.04 mm3 × 10−6/(N∙m)), were produced with the S-HVOF method. The wear mechanism of ceramic coatings included the adhesive wear mode supported by the fatigue-induced material delamination. Moreover, the presence of wear debris and tribofilm was confirmed. Finally, the coefficient of friction for the coatings was in the range between 0.44 and 0.68, with the highest values being recorded for APS sprayed coatings.

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“…Besides remarkable electrical insulating properties (Filofteia-Laura et al , 2011), alumina coatings exhibit the ability to protect the tribological stressed surface against abrasive, erosive and corrosive wear, even at extreme conditions, e.g. exposure to high temperatures, oxidation and pressure (Franco et al , 2019). Because of the capability of achieving high process temperatures, atmospheric plasma spraying (APS) is the most common process for depositing high melting materials such as alumina.…”

Section: Introductionmentioning

confidence: 99%

Correlation between pre- and post-treatments of additively manufactured 316L parts and the resulting low cycle fatigue behavior

Garthe

Hoyer

Hagen

et al. 2021

RPJ

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Purpose The currently existing restrictions regarding the deployment of additively manufactured components because of poor surface roughness, porosity and residual stresses as well as their influence on the low-cycle fatigue (LCF) strength are addressed in this paper. Design/methodology/approach This study aims to evaluating the effect of different pre- and post-treatments on the LCF strength of additively manufactured 316L parts. Therefore, 316L specimens manufactured by laser powder bed fusion were examined in their as-built state as well as after grinding, or coating with regard to the surface roughness, residual stresses and LCF strength. To differentiate between topographical effects and residual stress-related phenomena, stress-relieved 316L specimens served as a reference throughout the investigations. To enable an alumina coating of the 316L components, atmospheric plasma spraying was used, and the near-surface residual stresses and the surface roughness are measured and investigated. Findings The results have shown that the applied pre- and post-treatments such as stress-relief heat treatment, grinding and alumina coating have each led to an increase in LCF strength of the 316L specimens. In contrast, the non-heat-treated specimens predominantly exhibited coating delamination. Originality/value To the best of the authors’ knowledge, this is the first study of the correlation between the LCF behavior of additively manufactured uncoated 316L specimens in comparison with additively manufactured 316L specimens with an alumina coating.

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Tribological performance at high temperatures of alumina coatings applied by plasma spraying process onto a refractory material

Cited by 21 publications

References 31 publications

A Study on the Microstructural Characterization and Phase Compositions of Thermally Sprayed Al2O3-TiO2 Coatings Obtained from Powders and Water-Based Suspensions

A Study on the Microstructural Characterization and Phase Compositions of Thermally Sprayed Al2O3-TiO2 Coatings Obtained from Powders and Water-Based Suspensions

Wear Behavior Analysis of Al2O3 Coatings Manufactured by APS and HVOF Spraying Processes Using Powder and Suspension Feedstocks

Correlation between pre- and post-treatments of additively manufactured 316L parts and the resulting low cycle fatigue behavior

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