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材料工程  2013, Vol. 0 Issue (4): 12-16    DOI: 10.3969/j.issn.1001-4381.2013.04.003
  材料与工艺 本期目录 | 过刊浏览 | 高级检索 |
真空预氧化对冷喷涂CoNiCrAlY涂层组织及热腐蚀性能的影响
张林伟, 王鲁, 王全胜, 宁先进
北京理工大学 材料学院,北京 100081
Effect of Vacuum Pre-oxidation on Microstructure and Hot Corrosion Behavior of CoNiCrAlY Coating Prepared by Cold Spray
ZHANG Lin-wei, WANG Lu, WANG Quan-sheng, NING Xian-jin
School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China
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摘要 利用冷喷涂技术制备CoNiCrAlY涂层,并对涂层进行真空预氧化处理。结合X射线衍射,扫描电镜,能谱分析和透射电镜等方法分析了CoNiCrAlY涂层真空预氧化前后的微观组织结构,并研究了喷涂态涂层和真空预氧化涂层在900℃的75%Na2SO4+25%NaCl(质量分数,下同)熔盐中的热腐蚀行为和机理。结果表明:冷喷涂CoNiCrAlY涂层呈纳米晶结构,含氧量为0.12%,孔隙率小于0.28%(体积分数)。真空预氧化处理改善了涂层粒子间的结合,使涂层更加致密,并在涂层表面生成厚约0.26μm连续、致密的α-Al2O3氧化膜;喷涂态涂层和真空预氧化涂层在热腐蚀150h后表面均生成了以α-Al2O3为主的致密连续氧化膜,保护了基体免受腐蚀破坏;真空预氧化处理有效减缓了S和Cl等元素向涂层内扩散的速率,使涂层的抗腐蚀性能提高了近一倍。
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张林伟
王鲁
王全胜
宁先进
关键词 MCrAlY涂层纳米晶热腐蚀冷喷涂真空预氧化    
Abstract:CoNiCrAlY coatings were prepared by cold spray process. After deposition, the pre-oxidation of the coating was performed by vacuum heat-treatment. The microstructure and phase constituent of coating were characterized by XRD, FE-SEM and TEM. The corrosion behavior and mechanisms of as-sprayed and pre-oxidized coatings in molten 75%Na2SO4+25%NaCl (mass fraction, the same below) at 900℃ were also studied. The results show that the as-sprayed coating presents a nanocrystalline structure with low porosity (less than 0.28% volume fraction) and low oxygen content (0.12%). Vacuum pre-oxidation treatment improves the bonding status of particle interface and forms a continuous, uniform and dense α-Al2O3 layer, with an average thickness of 0.26μm. As-sprayed and pre-oxidized coatings can protect the substrate from hot corrosion due to the formation of the continuous and dense α-Al2O3 layer. Moreover, the vacuum pre-oxidation treatment can alleviate the diffusion of S and Cl into coating and thus lead to an increase of one time in the hot corrosion resistance than the as-sprayed coatings.
Key wordsMCrAlY coating    nanocrystalline    hot corrosion    cold spray    vacuum pre-oxidation
收稿日期: 2012-06-03      出版日期: 2013-04-20
1:  TG174.422  
基金资助:

高等学校博士学科点专项科研基金资助项目(20101101120030)

通讯作者: 宁先进(1974-),男,博士,主要从事冷喷涂涂层制备与性能研究,联系地址:北京理工大学材料学院(100081)     E-mail: nxj@bit.edu.cn
作者简介: 张林伟(1983—),男,博士研究生,主要从事热障涂层制备与性能研究,联系地址:北京理工大学材料学院(100081),E-mail: 10909040@bit.edu.cn
引用本文:   
张林伟, 王鲁, 王全胜, 宁先进. 真空预氧化对冷喷涂CoNiCrAlY涂层组织及热腐蚀性能的影响[J]. 材料工程, 2013, 0(4): 12-16.
ZHANG Lin-wei, WANG Lu, WANG Quan-sheng, NING Xian-jin. Effect of Vacuum Pre-oxidation on Microstructure and Hot Corrosion Behavior of CoNiCrAlY Coating Prepared by Cold Spray. Journal of Materials Engineering, 2013, 0(4): 12-16.
链接本文:  
http://jme.biam.ac.cn/CN/10.3969/j.issn.1001-4381.2013.04.003      或      http://jme.biam.ac.cn/CN/Y2013/V0/I4/12
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