Oxidation Behavior of Si-Modi?ed Aluminide Coatings on K438 Superalloy Prepared Using a Hybrid Slurry/Pack Cementation Process

Lina Zhang; Yuebo Zhou

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Oxidation Behavior of Si-Modi?ed Aluminide Coatings on K438 Superalloy Prepared Using a Hybrid Slurry/Pack Cementation Process

机译：Oxidation Behavior of Si-Modi?ed Aluminide Coatings on K438 Superalloy Prepared Using a Hybrid Slurry/Pack Cementation Process

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A Si-modi?ed aluminide coating was prepared on nickel-based K438 superalloy using a hybrid slurry/pack cementation process. The microstructures indicated that the coatings exhibited a two-layer structure: the outer Al-rich Ni0.9Al1.1 layer with the dispersion of minor Ni2Al3 and Cr-rich phases of Al13Cr2 and Cr5Si3 and the inner interdiffusion layer. For comparison, simple aluminide coatings were also produced using normal pack cementation. Compared with the K438 superalloy and simple aluminide counterpart, the Si-modi?ed aluminide coatings exhibited a lower oxidation rate and improved alumina scale adhesion in air at 1,100°C. Furthermore, the Si-modi?ed aluminide coatings showed longer service life compared to the simple aluminide coatings because the addition of Si mitigated the degradation of coatings. Therefore, the simple aluminide lost protection while the Si-modi?ed aluminide coatings were still protective after 300 h.

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《Corrosion: The Journal of Science and Engineering》 |2023年第1期|111-120|共10页
作者
Lina Zhang; Yuebo Zhou;
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作者单位

School of Mechanical Engineering and Automation, Shenyang Institute of Technology, Fushun, 113122, People’s Republic of China.;

Liaoning Key Laboratory of Information Physics Fusion and Intelligent Manufacturing for CNC Machine, Shenyang Institute of Tec;

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正文语种英语
中图分类金属腐蚀与保护、金属表面处理;
关键词
hybrid slurry; oxidation; pack cementation process; Si-modi?ed aluminide coating; superalloy;

Oxidation Behavior of Si-Modi?ed Aluminide Coatings on K438 Superalloy Prepared Using a Hybrid Slurry/Pack Cementation Process

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