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This work focuses on the study on the novel hybrid method of simultaneous spraying from two different materials (Al2O3 and TiO2) by means of suspension plasma spraying (SPS) using submicron powder and water suspension. The goal was to attempt the deposition of intermixed alumina-titania coatings, namely: Al2O3 + 3 wt.% TiO2, Al2O3 + 13 wt.% TiO2, and Al2O3 + 40 wt.% TiO2. Such compositions are already used but in the form of conventionally plasma sprayed coatings, with micrometer-sized powder. Meanwhile, the injection of feedstocks with submicron-sized particles has not been established yet. In particular, this paper uses two routes of feedstock injection, (i) with the use of an intermixed suspension and (ii) a double injection of separate suspensions. The attention was paid to the characterization of the feedstock materials, description of deposition parameters as well as the morphology, microstructure, and phase composition of the obtained coatings. Among all coatings, Al2O3 + 40 wt.% TiO2 sprayed with double injection contained the most homogeneously distributed and melted splats. The results from this work demonstrate the possibility of coating deposition both by intermixed and double injection concepts but also the need for the further application-relevant optimization, related to the presence of intercolumnar gaps in the microstructure of the coatings.

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This work focuses on the study on the novel hybrid method of simultaneous spraying from two different materials (Al2O3 and TiO2) by means of suspension plasma spraying (SPS) using submicron powder and water suspension. The goal was to attempt the deposition of intermixed alumina-titania coatings, namely: Al2O3 + 3 wt.% TiO2, Al2O3 + 13 wt.% TiO2, and Al2O3 + 40 wt.% TiO2. Such compositions are already used but in the form of conventionally plasma sprayed coatings, with micrometer-sized powder. Meanwhile, the injection of feedstocks with submicron-sized particles has not been established yet. In particular, this paper uses two routes of feedstock injection, (i) with the use of an intermixed suspension and (ii) a double injection of separate suspensions. The attention was paid to the characterization of the feedstock materials, description of deposition parameters as well as the morphology, microstructure, and phase composition of the obtained coatings. Among all coatings, Al2O3 + 40 wt.% TiO2 sprayed with double injection contained the most homogeneously distributed and melted splats. The results from this work demonstrate the possibility of coating deposition both by intermixed and double injection concepts but also the need for the further application-relevant optimization, related to the presence of intercolumnar gaps in the microstructure of the coatings.

Al2O3-TiO2 coatings deposition by intermixed and double injection SPS concepts

Wroclaw University of Science and Technology

Institute of Plasma Physics of the Czech Academy of Science

Materials Science-Poland

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

AlO-TiO coatings deposition by intermixed and double injection SPS concepts

This work focuses on the study on the novel hybrid method of simultaneous spraying from two different materials (Al2O3 and TiO2) by means of suspension plasma...

Al₂O₃-TiO₂ coatings deposition by intermixed and double injection SPS concepts

Published Online: Apr 29, 2022

Page range: 599 - 614

Received: Feb 08, 2022

Accepted: Mar 30, 2022

DOI: https://doi.org/10.2478/msp-2021-0046

Keywords
suspension plasma spraying, alumina-titania coatings, intermixed suspension, double injection, microstructure

© 2021 Monika Nowakowska et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Al2O3-TiO2 coatings deposition by intermixed and double injection SPS concepts

Published Online: Apr 29, 2022

Page range: 599 - 614

Received: Feb 08, 2022

Accepted: Mar 30, 2022

DOI: https://doi.org/10.2478/msp-2021-0046

Keywordssuspension plasma spraying, alumina-titania coatings, intermixed suspension, double injection, microstructure

© 2021 Monika Nowakowska et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Al₂O₃-TiO₂ coatings deposition by intermixed and double injection SPS concepts

Keywords
suspension plasma spraying, alumina-titania coatings, intermixed suspension, double injection, microstructure