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VACUUM ›› 2022, Vol. 59 ›› Issue (4): 56-63.doi: 10.13385/j.cnki.vacuum.2022.04.11

• Thin Film • Previous Articles     Next Articles

Influence of Aluminide Coating Prepared by Chemical Vapor Depositionon High-Temperature Protective Performance of Thermal Barrier Coating on Single Crystal Superalloy

WANG Li-zhe1,2, CAI Yan1,2, ZHNG Ru-jing1,2, HE Li-min1,2, MU Ren-de1,2   

  1. 1. Beijing Institute of Aeronautical Materials, Beijing 100095, China;
    2. Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material, Beijing 100095, China
  • Online:2022-07-25 Published:2022-08-09

Abstract: Aluminide coating was deposited on the nickel-based single crystal superalloy DD5 by chemical vapor deposition(CVD), then NiCoCrAlYHf(HY5) metal bond coat was deposited in situ by vacuum arc ion plating(ARC), and yttria-stabilized zirconia(6~8YSZ) was deposited by electron beam physical vapor deposition(EB-PVD). The isothermal oxidation protection performance of DD5+(HY5+YSZ) and DD5+(Al+HY5+YSZ) samples at 1100℃ was compared. X-ray diffraction, scanning electron microscope and electron probe methods were used to analyze the evolution of microstructure and composition of the two coatings during high temperature oxidation. The results show that DD5+(Al+HY5+YSZ) coating has a dense multi-layer structure and combines well with the substrate. After isothermal oxidation for 250h, the appearance of the two coatings both keep intact. During the isothermal oxidation process at 1100℃ for 250h, the oxidation rate constants of DD5 alloy, DD5+(HY5+YSZ) coating, and DD5+(Al+HY5+YSZ) coating are 0.415, 0.410, 0.354g2·m4·h-1, respectively. After isothermal oxidation for 250h, the highest Al contents in DD5+(HY5+YSZ) and DD5+(Al+HY5+YSZ) coatings are 5.8wt% and 16.7wt% respectively, which is in good accordance with Al content on the bond coat upper surface of 3.7wt% and 6.0wt%, and the thicknesses of thermal grown oxide(TGO) are 6.6μm and 9.4μm respectively. Element interdiffusion occurs between two coatings and the substrate,leading to the appearance of secondary reaction zone(SRZ). The SRZ in the DD5+(Al+HY5+YSZ) coating is more obvious and continuous than that in DD5+(HY5+YSZ).

Key words: CVD, aluminide coating, thermal barrier coating, EB-PVD, isothermal oxidation

CLC Number: 

  • TG174.4
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