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首页> 外文期刊>Key Engineering Materials >Influence of Impurities on the High-Temperature Water-Vapour Corrosion of Environmental Barrier Rare-Earth Silicates
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Influence of Impurities on the High-Temperature Water-Vapour Corrosion of Environmental Barrier Rare-Earth Silicates

机译：杂质对环境壁垒稀土硅酸盐的高温水蒸气腐蚀的影响

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摘要

Corrosion experiments on a number of rare earth di-silicates containing Y, Yb and Lu have been conducted in flowing air with 30 vol.% H_2O at 1500℃. Nominally the corrosion rate is slower by a factor 5 to 10 compared to silica. However, alumina impurity incorporation has a profound influence on the process of corrosion as it masks not only the gravimetric results but also changes the surface phase assemblages to contain rare earth garnets and liquid phases. It is presumed that silica loss occurs under those conditions via the liquid phase and does not necessarily follow the same kinetics as direct silicate corrosion. Furthermore, atmospheric silicon hydroxide saturation effects contribute to the corrosion process. Currently all determined corrosion rates of rare earth silicates are viewed as system specific only.
机译：已经在1500℃，含有30％（体积）H_2O的流动空气中对许多含有Y，Yb和Lu的稀土二硅酸盐进行了腐蚀实验。名义上，腐蚀速度比二氧化硅慢5到10倍。然而，氧化铝杂质的掺入对腐蚀过程有深远的影响，因为它不仅掩盖了重量分析的结果，而且改变了表面相的组成以包含稀土石榴石和液相。假定二氧化硅在那些条件下通过液相发生损失，并不一定遵循与直接硅酸盐腐蚀相同的动力学。此外，大气中的氢氧化硅饱和效应有助于腐蚀过程。当前，所有确定的稀土硅酸盐的腐蚀速率仅被视为特定于系统的腐蚀速率。

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