Effect of HfO2 content on CMAS corrosion resistance of a promising Hf6Ta2O17 ceramic for thermal barrier coatings. (November 2022)

• Record Type: Journal Article
• Authors: Liu, S.; Hu, X.P.; Liu, Q.; Guo, J.W.; Wu, J.Y.; Zhu, W.
• Is Part Of: Corrosion science. Volume 208(2022)
• Publication Date: 2022-11
• Subjects: Thermal barrier coatings (TBCs) -- Calcium-magnesium-alumina-silicate (CMAS) -- Hf6Ta2O17 ceramic -- HfO2 content -- Corrosion resistance mechanism; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2022.110712
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: The effect of HfO2 content on CMAS corrosion resistance of Hf6 Ta2 O17 ceramics at different temperatures is investigated. The results show that Hf6 Ta2 O17 ceramics with different HfO2 content exhibit no difference in CMAS corrosion resistance at 1250 °C and short-term corrosion (< 16 h). But Hf6 Ta2 O17 ceramic with a higher HfO2 content shows the best corrosion resistance at 1300 °C and 1400 °C under long-term corrosion (> 50 h). The increase in HfO2 content can reduce the reactivity of Hf6 Ta2 O17 ceramic with molten CMAS and increase the generation rate of dense product layers. Highlights: Temperature is the most important factor affecting the CMAS behavior of Hf6 Ta2 O17 ceramic. Hf6 Ta2 O17 ceramic with a higher HfO2 content exhibits the best corrosion resistance under long-term corrosion. The increase in HfO2 content can reduce the CMAS reactivity and improve the generation rate of dense product layers.