| 摘要: |
| 硅基材料具有密度小、高温力学性能优异等特性,在航空发动机热端部件有广阔的应用前景。 由于硅基材料的服役环境中充满高温燃气,硅基基体与高温燃气中的 H2O 发生化学反应生成挥发性 Si(OH)4 被高速燃气冲刷走,使得硅基基体持续暴露在燃气环境中,导致基体被不断侵蚀。 为了减缓高温燃气对硅基基体的侵蚀速率、延长其使用寿命,需要在基体表面制备环境障涂层以隔绝基体与燃气环境,阻止高温燃气与基体直接接触。 文中指出了第一代、第二代环境障涂层在应用中的局限性,阐述了第三代环境障涂层发展中面临的瓶颈问题。 从稀土硅酸盐面层和硅粘结层的角度分别剖析了限制第三代环境障涂层发展的因素并提出相应的改进措施,对新型环境障涂层的发展和面层及粘结层材料的选择具有指导意义。 |
| 关键词: 环境障涂层 稀土硅酸盐 粘结层 水氧腐蚀 热生长氧化物 |
| DOI：10.11933/j.issn.1007-9289.20200624002 |
| 分类号:TG174.2+3 |
| 文章编号:1007-9289(2020)05-0099-16 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(51772027) |
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| Restrictions and Corresponding Solutions of Environmental Barrier Coatings |
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Ma Zhuang1,2, Zhang Xueqin1,2, Liu Ling1,2
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1.School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081 , China;2.National Key La- boratory of Science and Technology on Materials under Shock and Impact, Beijng 100081 , China
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| Abstract: |
| Silicon-based ceramic has broad application prospect as high temperature structure materials in aero engines due to low density and excellent mechanical properties. In high-temperature steam environment, silicon-based ceramic will react with high temperature steam to form volatile Si(OH)4 . Si(OH)4 can be brushed away by high velocity steam, leading inner silicon- based ceramic exposing in high temperature steam environment. So we need to prepare environmental barrier coating (EBC) on the surface of silicon based ceramic to protect it from high temperature steam. The limiting factors of the development of first and second generations EBC are clearly pointed out in this review. We highlight the problems the third generation EBC facing from the perspectives of rare earth silicate top layer and silicon bonding layer. The corresponding solutions of the problems the third generation EBC facing are also elaborated. This review is of great significance in the selection of materials of up-to-date EBC. |
| Key words: environmental barrier coating rare earth silicate bond coating water vapor corrosion resistance thermal growing oxide |
