Crystallization behavior of plasma-sprayed lanthanide magnesium hexaaluminate coatings
来源期刊：International Journal of Minerals Metallurgy and Materials2014年第12期
论文作者：Liang-liang Huang Hui-min Meng Jing Tang
文章页码：1247 - 1253
摘 要：La Mg Al11O19 thermal barrier coatings（TBCs） were prepared by atmospheric plasma spraying. The crystallization behavior of the coatings and the synthesis mechanism of La Mg Al11O19 powders were researched. The results showed that the plasma-sprayed coatings contained some amorphous phase, and La Mg Al11O19 powders were partially decomposed into Al2O3, La Al O3, and Mg Al2O4 in the plasma spraying process. The amorphous phase was recrystallized at a temperature of approximately 1174.9°C, at which level the decomposed Al2O3, La Al O3, and Mg Al2O4 reacted again. The resynthesis temperature of La Mg Al11O19 in the plasma-sprayed coatings was lower than that of La Mg Al11O19 in the original raw powders. The synthesis mechanism of La Mg Al11O19 powders can be summarized as follows: during the first part of the overall reaction, La2O3 reacts with Al2O3 to form La Al O3 at approximately 900°C, and then La Al O3 further reacts with Al2O3 and Mg Al2O4 to produce La Mg Al11O19 at approximately 1200°C.
Liang-liang Huang，Hui-min Meng，Jing Tang
Corrosion and Protection Center, University of Science and Technology Beijing
摘 要：La Mg Al11O19 thermal barrier coatings（TBCs） were prepared by atmospheric plasma spraying. The crystallization behavior of the coatings and the synthesis mechanism of La Mg Al11O19 powders were researched. The results showed that the plasma-sprayed coatings contained some amorphous phase, and La Mg Al11O19 powders were partially decomposed into Al2O3, La Al O3, and Mg Al2O4 in the plasma spraying process. The amorphous phase was recrystallized at a temperature of approximately 1174.9°C, at which level the decomposed Al2O3, La Al O3, and Mg Al2O4 reacted again. The resynthesis temperature of La Mg Al11O19 in the plasma-sprayed coatings was lower than that of La Mg Al11O19 in the original raw powders. The synthesis mechanism of La Mg Al11O19 powders can be summarized as follows: during the first part of the overall reaction, La2O3 reacts with Al2O3 to form La Al O3 at approximately 900°C, and then La Al O3 further reacts with Al2O3 and Mg Al2O4 to produce La Mg Al11O19 at approximately 1200°C.
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