Hot corrosion behavior of LaTi2Al9O19 ceramic exposed to vanadium oxide at temperatures of 700–950 °C in air
2016; Elsevier BV; Volume: 104; Linguagem: Inglês
10.1016/j.corsci.2015.12.024
ISSN1879-0496
AutoresXin Zhou, Zhenhua Xu, Limin He, Jiaying Xu, Binglin Zou, Xueqiang Cao,
Tópico(s)Magnesium Oxide Properties and Applications
ResumoHot corrosion behavior of LaTi2Al9O19 ceramic exposed to V2O5 at 700–950 °C were investigated in order to better understand the corrosion resistance of LaTi2Al9O19 as a promising thermal barrier coating material. Results indicate that the degradation processes were significantly temperature dependent. At 700 °C, AlVO4, LaVO4 and TiO2 were the main corrosion products, while AlVO4 partially decomposed at 800 °C to form θ-Al2O3 and α-Al2O3. After exposure to 950 °C, V2O5 reacted with LaTi2Al9O19 to form LaVO4, α-Al2O3 and TiO2 as final corrosion products. The hot corrosion mechanisms were further discussed based on the phase diagrams of V2O5–Al2O3, V2O5–La2O3 and V2O5–TiO2 systems.
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