摘要
活性元素(RE)可以显著降低合金的氧化速率和提高氧化膜的抗剥落性能,在高温合金及高温防护涂层上已经得到了大量商业应用,但至今对其微观作用机制尚无统一认识,相关理论体系也不完整。从RE改性高温防护涂层的制备、RE效应及作用模型、过掺杂和共掺杂效应等方面,概述了活性元素在高温防护涂层领域应用的最新进展。重点分析了RE添加对高温过程中氧化膜生长机制、微观结构和氧化膜粘附性能的影响,过量掺杂对抗氧化性能的危害以及多种RE掺杂对合金基体的改善作用。RE改性要在高温防护涂层上体现最佳效果,除需关注RE掺杂对氧化膜生长和氧化膜/涂层基体界面结合状态的影响外,还必须考虑涂层和合金基体的互扩散、涂层中的氧含量、涂层厚度等因素对RE添加种类和添加量的影响。针对目前的研究结果,提出RE改性高温防护涂层在应用上最亟待解决的问题,是确定不同合金体系中RE掺杂的最佳种类和含量。最后,对未来的研究方向进行了展望。
Reactive element （RE） additions in superalloys can significantly reduce alloy oxidization rate and improve scale adherence, hence RE dopants have been widely applied to commercial superalloys and high temperature coatings for modifica- tion： However, unified understanding of RE effect mechanism and complete corresponding theoretical system were still un- available. Recent progress of RE in high temperature protective coatings was introduced from the aspects including RE modified high temperature protective coatings＇ manufacture methods, RE effect and mechanism models, over-doping and co-doping ef- fects. Effects of RE addition on oxide film growth mechanism, microstructure and oxide film adhesion, harmful effect of over- doping on oxidation resistance as well as improving effects of multiple REs doping on alloy substrate were analyzed emphati- cally. In addition to focusing on effects of RE doping on oxide film growth and bonding state of oxide film/coating substrate, effects of such factors as interdiffusion between the coating and substrate, oxygen content of the coatings and coating thickness on RE addition category and amount must be considered to optimize effects of RE modification on high temperature protective coating. In view of current research results, it was pointed out that the most urgent problem regarding application of RE mod- ified high temperature coatings was to determine optimal category and content of RE dopants in different alloy systems. Finally, future research orientations were proposed.
出处
《表面技术》
EI
CAS
CSCD
北大核心
2017年第8期201-207,共7页
Surface Technology
基金
国家自然科学基金(51501109)
上海高校青年教师培养资助计划(ZZGCD15059)
上海工程技术大学重点科研平台大学生创新训练计划(cz1605014)~~
关键词
高温防护涂层
高温氧化
活性元素效应
氧化膜
过掺杂
共掺杂
high temperature protective coatings
high temperature oxidation
reactive element effect
oxide film
overdop- ing
co-doping
