The purpose of this research was to investigate the corrosion behavior of the low/high Yb₂SiO₅ containing Yb₂Si₂O₇ coatings under high-velocity water vapor flow. To that end, Yb₂Si₂O₇ and Si coatings were deposited by atmospheric plasma spraying on SiC substrates. The corrosion tests were performed in the burned natural gas under atmospheric pressure, with a gas flow velocity of 100 m/s at 1200 °C for 200 h. After the test, a 25 µm thick, porous corrosion layer at the surface of the Yb₂Si₂O₇ rich coatings was found accompanied with a mass reduction, whereas samples with Yb₂SiO₅ rich coatings showed mass gain indicating the greater resistance of Yb₂SiO₅ against water vapor. A comparison of the Yb₂Si₂O₇ rich coatings tested in this work and Yb₂Si₂O₇ bulk samples tested in an earlier work at the same facility revealed significantly different recession rates. Possible mechanisms responsible for this distinct behavior are discussed in the manuscript.

这项研究的目的是研究在高速水蒸气流下含Yb ₂ Si ₂ O ₇的低/高Yb ₂ SiO ₅涂层的腐蚀行为。为此，通过大气等离子体喷涂在SiC衬底上沉积了Yb ₂ Si ₂ O ₇和Si涂层。在大气压下在燃烧的天然气中进行腐蚀测试，在1200°C下以100 m / s的气体流速进行200 h。测试后，在Yb ₂ Si ₂ O ₇的表面上形成了一个25 µm的多孔腐蚀层。发现富含涂层的涂层伴随着质量降低，而具有富含Yb ₂ SiO _5的涂层的样品显示出质量增加，表明Yb ₂ SiO ₅对水蒸气的抵抗力更大。在这项工作中测试的富含Yb ₂ Si ₂ O _7的涂层与在较早的工作中在同一设施中测试的Yb ₂ Si ₂ O ₇块状样品的比较显示出显着不同的衰退率。手稿中讨论了造成这种不同行为的可能机制。