Effect of microstructure of a NiCoCrAlY coating fabricated by high-velocity air fuel on the isothermal oxidation

被引：52
|
作者：
Lu, Jie [1 ]
Zhang, Han [1 ]
Chen, Ying [2 ]
Zhao, Xiaofeng [1 ]
Guo, Fangwei [1 ]
Xiao, Ping [3 ]
机构：
[1] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai Key Lab Adv High Temp Mat & Precis Formi, Shanghai 200240, Peoples R China
[2] OxMet Technol, Begbroke Sci Pk, Kidlington OX5 1PF, Oxon, England
[3] Univ Manchester, Sch Mat, MSS Tower, Manchester M13 9PL, Lancs, England
来源：
CORROSION SCIENCE | 2019年 / 159卷
基金：
英国工程与自然科学研究理事会;
关键词：
NiCoCrAlY; Grain size; Porosity; Oxidation; THERMAL BARRIER COATINGS; HIGH-TEMPERATURE OXIDATION; MCRALY BOND COATS; NI-AL ALLOYS; CYCLIC OXIDATION; ALUMINA SCALES; RESIDUAL-STRESS; FAILURE; BEHAVIOR; DIFFUSION;
D O I：
10.1016/j.corsci.2019.108126
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effect of grain size and porosity of a NiCoCrAlY coating fabricated by high-velocity air fuel on the isothermal oxidation behavior is studied. To understand this effect, the microstructure of coating, the chemistry and microstructure of thermally grown oxides (TGO), the phase transformation of alumina, the oxidation rate, and the TGO stress are investigated. It is demonstrated in this study that the oxidation and spallation resistance of TGO are predominantly determined by the porosity rather than grain size for the long term oxidation, although the nanoscale gamma-grains can facilitate the earlier establishment of alpha-Al2O3 scale.
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页数：14
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