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

被引：6

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.

引用

页数：11

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