| 摘要: |
| 纳米结构稀土硅酸盐涂层被认为是未来新型环境障涂层的发展方向,其中 Yb2 SiO5 由于与中间层莫来石的热物性能匹配良好、优异的抗水氧腐蚀能力成为非常有发展前景的环境障涂层面层候选材料。 从材料制备的角度出发, 探索纳米结构 Yb2 SiO5 喂料制备工艺并对喂料进行物相、组织结构和性能表征。 采用喷雾造粒加固相烧结的方法制备了纳米结构 Yb2 SiO5 喷涂粉体喂料,探索了制备高纯度 Yb2 SiO5 的固相烧结工艺,后续通过等离子处理改善粉体喂料的喷涂性能。 借助 X 射线衍射仪研究了粉体喂料的物相,采用扫描电镜、透射电镜研究了粉体喂料的形貌与微观结构。 结果显示,固相烧结工艺采用在 1500 ℃下保温 4 h,再将得到的粉体喂料等离子处理可得到高纯度的 Yb2 SiO5 喷涂粉体喂料,等离子处理之后的喂料为纳米结构,喂料粒度分布均符合等离子喷涂要求,喂料具有良好的流动性和致密性。 |
| 关键词: 喷雾干燥 等离子喷涂 Yb2 SiO5 喂料 |
| DOI：10.11933/j.issn.1007-9289.20200721003 |
| 分类号:TG174.44;V261 |
| 文章编号:1007-9289(2020)06-0108-10 |
| 文献标识码:A |
| 基金项目:国家科技重大专项(2017-VⅠ-0020-0093) |
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| Preparation and Characterization of Nanostructured Yb2 SiO5 Feedstock for Environmental Barrier Coatings |
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Deng Luwei, Zhang Xiaodong, Wang Dongsheng, Wang You
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School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001 , China
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| Abstract: |
| Nanostructured rare earth silicate coatings are considered to be the development direction of new environmental bar- rier coatings in the future. The thermophysical properties of Yb2 SiO5 and the interlayer mullite are well matched and have excel- lent water and oxygen corrosion resistance. It is considered to be a very promising candidate for environmental barrier coating surface layer. From the perspective of material preparation, explored the preparation process of nano-structured Yb2 SiO5 feed- stock and characterized its phase, structure and performance. The spray granulation and solid phase sintering method was used to prepare nanostructured Yb2 SiO5 sprayed feedstock, and the solid phase sintering process for preparing high-purity Yb2 SiO5 was explored, and plasma treatment was used to improve the spraying performance of the feedstock. The phase of the feedstock was studied with the aid of X-ray diffractometer, the morphologies and microstructure of the feedstock were studied by scanning elec- tron microscope and transmission electron microscope, and the fluidity, bulk density, tap density and particle size distributio- nand of the final feedstock were tested. Results show that the solid-phase sintering process adopts heat preservation at 1500 ℃ for 4 h, and then plasma treatment of the feedstock can obtain high-purity Yb2 SiO5 sprayed feedstock. The feedstock after plas- ma treatment is nano-structured and the particle size distribution of the feedstock meets the requirements of plasma spraying, and the feedstock has good fluidity and compactness. |
| Key words: spray drying plasma spraying Yb2 SiO5 feedstock |
