| JIANG Cheng-yang,FENG Min,CHEN Ming-hui,GENG Shu-jiang,WANG Fu-hui.Current Research Status of Simple/Modified Aluminide Coatings[J],50(9):33-42 |
| Current Research Status of Simple/Modified Aluminide Coatings |
| Received:March 30, 2021 Revised:June 02, 2021 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2021.09.003 |
| KeyWord:Ni-based alloy Fe-based alloy titanium alloy aluminide coating high temperature oxidation resistance modification |
| Author | Institution |
| JIANG Cheng-yang |
Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang , China |
| FENG Min |
Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang , China |
| CHEN Ming-hui |
Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang , China |
| GENG Shu-jiang |
Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang , China |
| WANG Fu-hui |
Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang , China |
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| Abstract: |
| The high temperature structural materials of various parts of aero-engine will suffer from serious oxidation and hot corrosion when they are in service under harsh environment. A dense and slow-growing Al2O3 scale, which can segregate the corrosive medium and prevent the matrix alloy from rapid oxidation and corrosion, is formed on the surface of aluminide coatings at high temperature when aluminide coatings are applied on alloys. The advantages of aluminide coating, including simple preparation and cost-effective, are summarized. The microstructures of aluminide coatings formed on Ni-based, Fe-based and Ti/TiAl-based alloys are mainly reviewed. The microstructure of the coating mainly depends on the aluminisation process, the composition of the substrate and the post-treatment process. Among them, the aluminisation process includes the composition of aluminisation agent, aluminisation temperature and aluminisation duration. Aluminisation temperature plays an important role in the structure of coatings. At high temperature, the activity of Al is low, and the coating is formed mainly by outward-diffusion of the matrix elements. But at low temperature aluminizing, the activity of Al is higher, and coating is formed mainly by Al inward-diffusion. The oxidation behaviour of different aluminide coatings in dry and steam atmosphere at high temperature is also concluded, and the effect of water vapour on the oxidation behaviour of aluminide coatings is described. The high-temperature oxidation resistance of Ni-Al and Fe-Al coatings are compared. The research progress of three kinds of modified aluminide coatings, i.e. Cr-Al, Si-Al and Pt-Al coatings is introduced meanwhile, including preparation method, the microstructure and high-temperature oxidation resistance. Finally, the development trend of high temperature protective coating is prospected and summarized. |
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