Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8044141 | Vacuum | 2018 | 26 Pages |
Abstract
By using Y2O3 nanoparticles, instead of part of Al2O3, acting as filler, Y2O3-modified aluminide coatings were produced on 309 stainless steel using a conventional pack-cementation method at 600â¯Â°C for 8â¯h. For comparison, normal aluminide coating was also produced using pure Al2O3 acting as filler. Effect of Y2O3 on the coating microstructure and oxidation resistance at 900â¯Â°C was comparably investigated. The results indicated that the entrapped Y2O3 particles not only significantly refined the grain of aluminide coatings but also promoted the formation of a dense, adherent and continuous α-Al2O3 layer. With the oxidation, the Y2O3 particles, after being swept by the inward-growing alumina scale, partially dissolves to produce Y cations. The segregation and migration of Y cations along the short-circuit path hinder the outward diffusion of Al, thus further decrease the scaling rate.
Related Topics
Physical Sciences and Engineering
Materials Science
Surfaces, Coatings and Films
Authors
Yongdong Wang, Jixiao Wang, Haiting Hu, Junsheng Meng, Xia Zhao,