Cyclic oxidation behavior of Al-Si coating on new γ′-strengthened cobalt-based superalloy: Experimental study and first-principles calculation

被引：13

作者：

Feng, Kanglu ^{[1
]}

Li, Meifeng ^{[1
]}

Chen, Mingyue ^{[1
]}

Li, Zhen ^{[2
]}

Sha, Jiangbo ^{[1
]}

Zhou, Chungen ^{[1
]}

机构：

[1] Beijing Univ Aeronaut & Astronaut, Dept Mat Sci & Engn, Key Lab Aerosp Mat & Performance, Minist Educ, Beijing 100191, Peoples R China

[2] Univ Warwick, Sch Engn, Coventry CV4 7AL, W Midlands, England

来源：

CORROSION SCIENCE | 2021年 / 185卷

基金：

中国国家自然科学基金;

关键词：

Metal coatings; Superalloys; Thermal cycling; Oxidation; DEFORMATION; ALLOY; DZ40M; TI;

D O I：

10.1016/j.corsci.2021.109422

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The aluminide coatings with and without Si modification were prepared on the new gamma-strengthened cobalt-based superalloy using a pack cementation method. Cyclic oxidation of the coated Co-based superalloy was study at 1050 degrees C. The weight changes of Al coating and Al-Si coating were -4.28 mg/cm(2) after 248 cycles and -3.40 mg/cm(2) after 346 cycles, respectively. The cyclic oxidation resistance of the Al coating was effectively improved by Si modification. Based on the experimental study and the first-principles calculation, it is suggested that Si addition facilitated the formation of a protective Al2O3+SiO2 film and reduced oxygen diffusion in the coating.

引用

页数：9

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