High-temperature corrosion behaviour of plasma sprayed lanthanum magnesium hexaluminate coating by vanadium oxide. Issue 1 (January 2015)

• Record Type: Journal Article
• Authors: Chen, Xiaolong; Cao, Xueqiang; Zou, Binglin; Gong, Jun; Sun, Chao
• Is Part Of: Journal of the European Ceramic Society. Volume 35:Issue 1(2015:Jan.)
• Page Start: 227
• Page End: 236
• Publication Date: 2015-01
• Subjects: Thermal barrier coating -- Hexaluminate -- Plasma spray -- Hot corrosion; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2014.08.035
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Plasma sprayed lanthanum magnesium hexaluminate (LaMgAl11 O19, LaMA) coating degraded by molten V2 O5 at 710–1050 °C was studied. LaVO4, Mg0.388 Al2.408 O4 and γ-Al2 O3 were the main corrosion products at 710 °C and 800 °C, while the corrosion products were LaVO4, MgAl2 O4, α-Al2 O3 at 950 °C and 1050 °C. AlVO4 as an important intermediate corrosion product had strong influences on the formations of γ- or α-Al2 O3 at different temperature regions. Recrystallization and hot corrosion happened to LaMA coating simultaneously at 950 °C and 1050 °C. However, at 800 °C, LaMA coating underwent the most serious degradation along the coating thickness direction due to the presence of amorphous phase.