High-temperature corrosion behaviour of plasma sprayed lanthanum magnesium hexaluminate coating by vanadium oxide
High-temperature corrosion behaviour of plasma sprayed lanthanum magnesium hexaluminate coating by vanadium oxide
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DOI：
10.1016/j.jeurceramsoc.2014.08.035
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发表时间：
2015
影响因子：
5.7
通讯作者：
Xiaolong Chen;Xueqiang Cao;B. Zou;J. Gong;Chao Sun
中科院分区：
文献类型：
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作者：
Xiaolong Chen;Xueqiang Cao;B. Zou;J. Gong;Chao Sun
研究了等离子喷涂六铝酸镧镁(LaMgAl11O19，LAMA)涂层在710-1050℃下被熔融V2O5降解的情况。在710℃和800℃时，腐蚀产物主要为LaVO_4、Mg0.388、Al_2O_4和γ-Al_2O_3；在950℃和1050℃时，腐蚀产物主要为LaVO_4、Mg_2O_4、α-Al_2O_3。AlVO_4作为重要的中间腐蚀产物，在不同温度区对γ-或α-Al_2O_3的形成有很大影响。在950℃和1050℃时，LaMA涂层同时发生再结晶和热腐蚀，但在800℃时，由于非晶相的存在，LaMA涂层沿涂层厚度方向的退化最为严重。
Plasma sprayed lanthanum magnesium hexaluminate (LaMgAl11O19, LaMA) coating degraded by molten V2O5at 710–1050 °C was studied. LaVO4, Mg0.388Al2.408O4and γ-Al2O3were the main corrosion products at 710 °C and 800 °C, while the corrosion products were LaVO4, MgAl2O4, α-Al2O3at 950 °C and 1050 °C. AlVO4as an important intermediate corrosion product had strong influences on the formations of γ- or α-Al2O3at 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.