2020
DOI: 10.3390/ma13112638
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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

Abstract: 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 … Show more

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Cited by 17 publications
(8 citation statements)
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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%
See 1 more Smart Citation
“…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%
“…In both SPS processes, the stand-off distances were similar to the powder-based APS process. S-HVOF spraying was performed at Fraunhofer IWS using an HVOF Top Gun (GTV Verschleißschutz GmbH, Luckenbach, Germany) with a modified combustion chamber that allowed internal and axial feeding of the suspension, as previously described by Toma et al [22,25,42].…”
Section: Coating Characterizationmentioning
confidence: 99%
“…Although the suspension injection pressure was set so that the mean particle trajectory was along the plasma jet axis, it is visible that some of the feedstock encountered the plasma periphery areas. It should also be noted that similar topography was observed in the alumina SPS coatings presented in the previous work [18]. Moreover, inhomogeneous melting of agglomerated powder particles has been noted also by other researchers [35].…”
Section: Coatingssupporting
confidence: 87%
“…Alumina-titania coatings were sprayed mainly by the conventional plasma spraying method [13], with the use of micrometer-sized powders [14]. Only several trials were carried out to deposit these coatings from suspensions, to study the effect of particle size [15], phase composition [16], and wear properties [9], including also our previous studies published in [17] and [18]. Coatings studied in this paper will be regarded for the contents of TiO 2 equal to 3, 13, and 40 wt.% (AT3, AT13, AT40), which are typical compositions sprayed by the conventional powder spraying [19].…”
Section: Introductionmentioning
confidence: 99%
“…One of the papers in this Special Issue investigates SPS-derived double-layered Gadolinium Zirconate/Yttria-Stabilized Zirconia (YSZ) coatings [7]. The rapidly growing interest in this method is apparent from contributions that extend use of SPS to other materials such as oxides [8] and carbides [9], as well as to other high-velocity non-plasma spray processes [8,10].…”
mentioning
confidence: 99%