铌酸铝/莫来石复合陶瓷环境阻障涂层高温水蒸气腐蚀行为研究
Corrosion Behavior of AlNbO4/Mullite Composite as Environmental Barrier Coating in Water Vapor Environment
(State Key Lab of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China)
Received date: 2009-10-22
Revised date: 2009-12-09
Online published: 2010-04-27
吴 疆 , 林 红 , 李建保 , 李俊峰 . 铌酸铝/莫来石复合陶瓷环境阻障涂层高温水蒸气腐蚀行为研究[J]. 无机材料学报, 2010 , 25(4) : 445 -448 . DOI: 10.3724/SP.J.1077.2010.09725
AlNbO4/mullite composite environmental barrier coating (EBC) with 5mol% AlNbO4 content was prepared on Si3N4 substrate by atmospheric plasma spraying (APS). There was evidence that the weight loss rate of Si3N4 substrate coated by AlNbO4/mullite composite was less than that of Si3N4 substrate coated by mullite during the first 50h corrosion test. The improved protective capacity of AlNbO4/mullite composite coating was ascribed to the formation of glassy AlNbO4 top surface. After 100h corrosion test, the AlNbO4/mullite coating was still stable and no further corroded cavities were observed. However, slight delamination of the coating and a faster weight loss rate was observed after long time corrosion due to the coefficient of thermal expansion (CTE) mismatch between AlNbO4/mullite composite and Si3N4 substrate.
Key words： mullite; AlNbO4; environmental barrier coating; water vapor corrosion
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