J. Mater. Sci. Technol. ›› 2022, Vol. 120: 65-77.DOI: 10.1016/j.jmst.2021.10.055

• Research Article • Previous Articles     Next Articles

Formation process and oxidation behavior of MCrAlY + AlSiY composite coatings on a Ni-based superalloy

S.M. Lia,b, L.B. Fua,b, W.L. Zhanga,b, W. Lib,*(), J. Sunc, T.G. Wangd, S.M. Jiangb,*(), J. Gongb, C. Sunb,*()   

  1. aSchool of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
    bShi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
    CAdvanced Research Institute for Multidisciplinary Science, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
    DTianjin Key Laboratory of High Speed Cutting and Precision Machining, Tianjin University of Technology and Education, Tianjin 300222, China
  • Received:2021-07-30 Revised:2021-10-10 Accepted:2021-10-20 Published:2022-09-01 Online:2022-02-24
  • Contact: W. Li,S.M. Jiang,C. Sun
  • About author:* E-mail addresses: wli@imr.ac.cn (W. Li),

Abstract:

An AlSiY coating and two MCrAlY + AlSiY composite coatings with different thickness of MCrAlY interlayer were prepared by arc ion plating (AIP) and vacuum annealing. The isothermal oxidation behavior of coatings at 1100 °C for 300 h was also investigated to characterize the microstructure evolution of coatings during annealing. The composite coatings exhibited a better high-temperature oxidation resistance at 1100 °C. The reason is that the addition of MCrAlY layer can greatly contribute to prevent the diffusion of refractory elements to the outer layer. The inhibition of Al inward diffusion can be much stronger, as the Si content increases in the outer layer during annealing.

Key words: Composite coating, Annealing, Arc ion plating, SEM, Oxidation