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Y2SiO5 environmental barrier coatings for niobium silicide based materials

机译：用于硅化铌基材料的Y2SiO5环保涂料

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摘要

The oxidation behaviour of Nb silicide based alloys, considered as potential ultra-high temperature material for gas turbine engine applications, can be improved by chromia-silica forming coatings with M7Si6 structure. To stabilise the protective oxide scales against water vapour corrosion in combustion atmospheres, environmental barrier coatings (EBCs) of yttrium silicate were deposited on an FeB modified M7Si6 based bond coat using magnetron sputtering. The 15-20 mm thick ceramic top coats with an approximate chemical composition of 25Y-13Si-62O (at.-%) were dense and amorphous after deposition. They were annealed in vacuum to get a crystalline structure with the predominant phase Y2SiO5. Samples with this EBC system were tested in rapidly flowing water vapour at temperatures between 1100 and 1300 degrees C for up to 16 h. At 1100 and 1200 degrees C, significantly reduced mass gains were determined for samples with yttrium silicate top coat in comparison to those coated only with FeB containing layers. The EBC partially transformed into the Y2Si2O7 phase and exhibited microporosity. At 1300 degrees C, the yttrium silicate layer decomposed forming yttrium oxides.
机译：Nb硅化物基合金（被认为是燃气涡轮发动机应用中潜在的超高温材料）的氧化行为可通过形成M7Si6结构的氧化铬硅涂层来改善。为了使保护性氧化皮在燃烧气氛中免受水蒸气腐蚀的影响，使用磁控溅射将硅酸钇的环境屏障涂层（EBC）沉积在FeB改性的M7Si6基粘结涂层上。化学沉积为约25Y-13Si-62O（at .-％）的15-20 mm厚的陶瓷面漆在沉积后是致密无定形的。将它们在真空中退火，得到主要相为Y2SiO5的晶体结构。使用此EBC系统的样品在1100至1300摄氏度之间的温度快速流动的水蒸气中测试了长达16小时。与仅用含FeB层涂覆的样品相比，在1100和1200℃下，具有硅酸钇钇涂层的样品的质量增加明显减少。 EBC部分转化为Y2Si2O7相，并表现出微孔性。在1300℃，硅酸钇层分解形成氧化钇。

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