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首页> 外文期刊>Journal of the European Ceramic Society >Hot corrosion behaviors of gas tunnel type plasma sprayed La_2Zr_2O_7 thermal barrier coatings
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Hot corrosion behaviors of gas tunnel type plasma sprayed La_2Zr_2O_7 thermal barrier coatings

机译：气体隧道式等离子喷涂La_2Zr_2O_7热障涂层的热腐蚀行为

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摘要

Gas tunnel type plasma sprayed free-standing La_2Zr_2O_7 coating specimens with a thickness of 300-100 μm were prepared under optimized operating conditions and were subjected to hot corrosion test in the presence of corrosive impurities such as V_2O_5, Na_2SO_4, and Na_2SO_4 + V_2O_5 mixtures (60:40 wt%) at two different temperatures for duration of 5h, i.e. 1000 and 1350 K for V_2O_5 and Na_2SO_4 + V_2O_5 mixtures, 1200 and 1350K for Na_2SO_4. For temperatures at 1350 K, the reaction mechanism of V_2O_5 and the mixture of Na_2SO_4 + V_2O_5 are similar and LaVO_4 is formed as the corrosive product, which leads to massive phase transformation from pyrochlore to tetragonal and monoclinic phases. Microstructural observations from planar reaction zone (PRZ) and melt infiltrated reaction zone (M1RZ) reveals that the present La_2Zr_2O_7 coating exhibit good hot corrosion resistance in V_2O_5 environment and moderate for the mixture of Na_2SO_4 + V_2O_5, but is worst in Na_2SO_4 environment.
机译：在最佳操作条件下制备厚度为300-100μm的气体隧道式等离子喷涂自立La_2Zr_2O_7涂层样品，并在存在腐蚀性杂质（例如V_2O_5，Na_2SO_4和Na_2SO_4 + V_2O_5混合物）的情况下进行热腐蚀测试（ 60:40 wt％）在两个不同的温度下持续5h，即V_2O_5和Na_2SO_4 + V_2O_5混合物为1000和1350 K，Na_2SO_4为1200和1350K。在1350 K的温度下，V_2O_5与Na_2SO_4 + V_2O_5的混合物的反应机理相似，并且形成LaVO_4作为腐蚀产物，这导致从烧绿石到四方相和单斜晶相的大量相变。从平面反应区（PRZ）和熔体渗透反应区（M1RZ）的微观结构观察表明，目前的La_2Zr_2O_7涂层在V_2O_5环境中表现出良好的耐热腐蚀性能，对Na_2SO_4 + V_2O_5的混合物表现出中等的耐热性，但在Na_2SO_4环境中表现最差。

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