| TIAN Li-xi,PENG Xiao.Research Progress of a Novel Nano-composited MCrAl(Y) Coating Prepared by Electrodepostion[J],51(9):74-82 |
| Research Progress of a Novel Nano-composited MCrAl(Y) Coating Prepared by Electrodepostion |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.09.007 |
| KeyWord:NiCrAlY coating electrodeposition electrophoretic deposition nanoparticle high-temperature corrosion |
| Author | Institution |
| TIAN Li-xi |
School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang , China;Jiangxi Provincial Engineering Research Center for Surface Technology of Aeronautical Materials, Nanchang , China |
| PENG Xiao |
School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang , China;Jiangxi Provincial Engineering Research Center for Surface Technology of Aeronautical Materials, Nanchang , China |
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| Abstract: |
| Owing to a good physical compatibility with high-temperature metallic structural materials, Cr2O3- or Al2O3- forming MCrAlY coatings have been extensively applied to hot section parts used in aerospace and other fields against high temperature corrosion. Currently, MCrAlY coatings are manufactured by means of physical methods, including electron beam-physical vapor deposition, magnetron sputtering, ion plating, thermal spray, etc. This review paper introduces a novel nanocomposite-type MCrAl(Y) coating prepared by an electrochemical method of nanocomposite electrodeposition. The microstructure features and high temperature corrosion behaviors of the coatings are discussed. In order to apply CrAl-containing nanoparticles to manufacturing MCrAl(Y) coatings, a nanocomposite electrodeposition method and the further modified "electrophoretic deposition + electrodeposition" method are adopted. The novel MCrAl(Y) coatings exhibit much stronger ability in selected oxidation of Cr or Al compared with the coatings prepared by traditional methods, which can be attributed to the "nanoscale effect" of the dispersed CrAl nanoparticles as well as the "nanocrystal effect" of the nickel matrix. Based on the understanding of the nucleation and growth of Cr2O3 or Al2O3, a selective oxidation model on a basis of the microstructural characteristics of the nanocomposite coatings is outlined, which illustrates the composition determined oxidation processes resulting in formation of different types of oxide scales. By summarizing a large amount of oxidation data of the nanocomposite-type NiCrAl coatings under different oxidation conditions, the oxidation maps are constructed, clearly showing the relationship between the coatings’ composition and the type of the oxides. Moreover, the new "electrophoretic deposition+electrodeposition" method can be further applied to conveniently integrating a metallic-ceramic diffusion barrier into a MCrAl(Y) coatings/Ni-based superalloy system, which can significantly block the interdiffusion between the coating and the matrix, in order to mitigate both the formation of detrimental second reaction zone (SRZ) in the matrix and the excess loss of Cr and Al in the coatings. It has been proved that the cermet-type NiRe-Al2O3 diffusion barrier can not only significantly block the interdiffusion between the NiAl coating and the DD6 single crystal Ni-base superalloy, but also keep well bonded with the matrix during oxidation for 50 hours at 1 050 ℃ in air. The novel nanocomposite electrodeposition method offers a now route to smartly manufacture Cr2O3- or Al2O3- forming MCrAlY coatings. In future, the reactive element effect of rare earth element Y on the corrosion behavior of MCrAl system should be investigated. Then the "electrophoretic deposition+electrodeposition" process used for assembling metallic-ceramic diffusion barrier needs to be further optimized. Moreover, the high temperature corrosion behavior of the integratedly prepared coating/diffusion barrier system still requires systematic study, in order to realize engineering application of the new nanocomposite-type MCrAl(Y) coatings. |
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