Study on the oxidation resistance mechanism of self-healable NiAl coating deposited by atmospheric plasma spraying

被引：7
作者：
Zhang, Li [1 ]
Wang, Di [1 ]
Liao, Xian-Jin [1 ]
Chen, Rui [1 ]
Luo, Xiao-Tao [1 ]
Li, Chang-Jiu [1 ]
机构：
[1] Xi An Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Mech Behav Mat, Xian 710049, Shaanxi, Peoples R China
来源：
NPJ MATERIALS DEGRADATION | 2023年 / 7卷 / 01期
关键词：
HIGH-TEMPERATURE OXIDATION; MCRALY BOND COATS; CYCLIC OXIDATION; BEHAVIOR; CORROSION; FAILURE; LIFETIME; HVOF;
D O I：
10.1038/s41529-023-00383-0
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A dense NiAl coating with low oxide content was deposited on the GH4202 superalloy substrate by atmospheric plasma spraying (APS) using carbon-containing Ni/Al composite powders. Compared with traditional APS NiAl coatings with high oxide content, this coating exhibits better long-term oxidation resistance at 900 & DEG;C in air. For the NiAl coating with low oxide content, it was found that the improved inter-splat bonding, due to limited oxide inclusions, promotes the formation of a continuous protective Al2O3 layer on the coating surface during oxidation. During long-term oxidation, the dispersion of oxide scales within the coating and element diffusion across splats result in the in-situ healing of unbonded inter-splat interfaces.
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页数：11
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