Abstract
Al2O3–ZrO2–TiO2 coatings were successfully prepared by plasma spraying Al2O3–ZrO2 composite powders with and without TiO2 addition. The effects of TiO2 on the phase composition, microstructure and properties of the Al2O3–ZrO2 coating were studied. The results show that the Al2O3–ZrO2–TiO2 composite powder was composed of t-ZrO2, α-Al2O3, m-ZrO2 and rutile, while the Al2O3–ZrO2–TiO2 composite coating consisted of t-ZrO2, α-Al2O3 and γ-Al2O3. The diffraction peaks of TiO2 could not be detected in the Al2O3–ZrO2–TiO2 coating even up to 10 wt% TiO2 addition. The reason may be that TiO2 was dissolved in the amorphous phase or formed solid solution with γ-Al2O3 phase in the coating during cooling. Compared with the Al2O3–ZrO2 coating, the as-prepared Al2O3–ZrO2–TiO2 coating had denser microstructure, less microcracks and more amorphous phases. The density of the Al2O3–ZrO2–TiO2 coating increased with the increase of TiO2 content. The Al2O3–ZrO2–10wt%TiO2 coating had the most uniform and dense microstructure, possessed higher toughness, adhesive strength and wear resistance compared with the Al2O3–ZrO2 coating, which was due to its lower porosity and more uniform microstructure.
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Acknowledgements
This study was financially supported by the National Natural Science Foundation of China (Nos.51672067, 51541208 and 51102074), the Natural Science Foundation of Hebei Province (Nos.E2018202034 and E2015202070), the Talent Training Project in Hebei Province (No.A2016002026) and the Top Talents in Universities in Hebei Province (No.SLRC2017027).
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Gao, PY., Ma, YD., Sun, WW. et al. Microstructure and properties of Al2O3–ZrO2–TiO2 composite coatings prepared by plasma spraying. Rare Met. 40, 1825–1834 (2021). https://doi.org/10.1007/s12598-020-01505-2
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DOI: https://doi.org/10.1007/s12598-020-01505-2