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Effect of Processing on High-Velocity Water Vapor Recession Behavior of Yb-Silicate Environmental Barrier Coatings
Journal of the European Ceramic Society ( IF 5.8 ) Pub Date : 2018-11-30 , DOI: 10.1016/j.jeurceramsoc.2018.11.048
Emine Bakan , Yoo Jung Sohn , Willy Kunz , Hagen Klemm , Robert Vaßen

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.



中文翻译:

加工工艺对Yb-硅酸盐环境屏障涂料高速水蒸气衰退行为的影响

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。

更新日期:2018-12-01
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