摘要
为了改善Ti Al合金的高温抗氧化性能,采用大气等离子喷涂的方法,在TiAl合金表面制备了稀土元素Ce改性的NiCrAlY涂层,对NiCrAlY和NiCrAlYCe涂层体系进行了900℃/100 h的恒温氧化试验,分析了稀土元素Ce对NiCrAlY涂层的微观组织形貌和相组成的影响,并进一步探讨了其对NiCrAlY涂层高温氧化机制的影响。研究结果表明,稀土元素Ce的添加能够有效地改善NiCrAlY涂层的高温抗氧化性能。在900℃下恒温氧化100 h后,稀土元素Ce的添加使NiCrAlY涂层的氧化增重降低了16%,氧化速率下降了33%。稀土元素Ce能够促进Al的选择性氧化,抑制NiCr2O4尖晶石氧化物的产生,从而阻碍O的内扩散。稀土元素Ce的添加有效地减小了NiCrAlY/TiAl体系的互扩散区厚度,缓慢的氧化物层生长和元素互扩散有利于改善NiCrAlY涂层的结合性能和抗氧化性能。
In order to improve the high temperature oxidation resistance of TiAl alloys,the rare earth Ce modified NiCrAlY coatings were prepared on TiAl alloys by atmospheric plasma spraying.The oxidation tests of NiCrAlY and NiCrAlYCe coatings were carried out at 900℃for 100 h.The effect of rare earth Ce on the microstructures and phase compositions of NiCrAlY coatings were analyzed,and its effect on the high temperature oxidation mechanism was further discussed.The results indicated that the addition of rare earth Ce can improve the high temperature oxidation resistance of NiCrAlY coatings effectively.After oxidation at 900℃for 100 h,the addition of rare earth Ce reduced the oxidation weight gain of NiCrAlY coating by 16%and decreased the oxidation rate by 33%.The rare earth Ce can promote the selective oxidation of Al and inhibit the production of NiCr2O4 spinel oxides,thus inhibiting the internal diffusion of O.The addition of rare earth element Ce reduced the thickness of the interdiffusion zones of the NiCrAlY/TiAl systems.The slow growth of the oxide layers and the element interdiffusion rate are beneficial to improve the bonding and oxidation resistance of the NiCrAlY coating.
作者
宫雪
沈远景
刘亚莉
邢跃骞
孙鑫
卢瑞祥
魏振东
张晓东
王铀
GONG Xue;SHEN Yuanjing;LIU Yali;XING Yueqian;SUN Xin;LU Ruixiang;WEI Zhendong;ZHANG Xiaodong;WANG You(College of Aerospace Engineering,Shenyang Aerospace University,Shenyang 110136,China;Department of Materials Science,School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China)
出处
《郑州航空工业管理学院学报》
2024年第3期54-64,共11页
Journal of Zhengzhou University of Aeronautics
基金
国家自然科学基金青年基金项目(52001217)
辽宁省博士科研启动基金计划项目(2021-BS-195)。
