Hot corrosion behavior of LaTi2Al9O19 ceramic exposed to vanadium oxide at temperatures of 700-950 degrees C in air
Hot corrosion behavior of LaTi2Al9O19 ceramic exposed to vanadium oxide at temperatures of 700-950 degrees C in air
复制标题
LaTi2Al9O19陶瓷在700-950℃空气中暴露于氧化钒的热腐蚀行为
DOI：
10.1016/j.corsci.2015.12.024
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发表时间：
2016
影响因子：
8.3
通讯作者：
Cao Xueqiang
中科院分区：
文献类型：
--
作者：
Zhou Xin;Xu Zhenhua;He Limin;Xu Jiaying;Zou Binglin;Cao Xueqiang
为了更好地了解LaTi 2Al 9 O 19陶瓷作为一种有前途的热障涂层材料的耐蚀性，研究了LaTi 2Al 9 O 19陶瓷在700-950 °C的V2 O 5热腐蚀行为。结果表明，降解过程是显着的温度依赖性。在700 °C时，主要腐蚀产物为AlVO 4、LaVO 4和TiO 2，而AlVO 4在800 °C时部分分解，生成θ-Al 2 O3和α-Al 2 O3。在950 °C下，V2 O 5与LaTi 2Al 9 O 19反应生成LaVO 4、α-Al 2 O3和TiO 2。根据V2 O 5-Al 2 O3、V2 O 5-La 2 O3和V2 O 5-TiO 2体系相图，进一步讨论了热腐蚀机理。
Hot corrosion behavior of LaTi2Al9O19ceramic exposed to V2O5at 700–950 °C were investigated in order to better understand the corrosion resistance of LaTi2Al9O19as a promising thermal barrier coating material. Results indicate that the degradation processes were significantly temperature dependent. At 700 °C, AlVO4, LaVO4and TiO2were the main corrosion products, while AlVO4partially decomposed at 800 °C to form θ-Al2O3and α-Al2O3. After exposure to 950 °C, V2O5reacted with LaTi2Al9O19to form LaVO4, α-Al2O3and TiO2as final corrosion products. The hot corrosion mechanisms were further discussed based on the phase diagrams of V2O5–Al2O3, V2O5–La2O3and V2O5–TiO2systems.