J. Mater. Sci. Technol. ›› 2009, Vol. 25 ›› Issue (06): 799-802.

• Articles • 上一篇    下一篇

Substrate Effects on the High-Temperature Oxidation Behavior of Thermal Barrier Coatings

何利民   

  1. 北京航空材料研究院
  • 收稿日期:2009-02-17 修回日期:2008-07-18 出版日期:2009-11-28 发布日期:2009-11-24
  • 通讯作者: 何利民

Substrate Effects on the High-Temperature Oxidation Behavior of Thermal Barrier Coatings

Limin He, Zhenhua Xu, Jianping Li, Rende Mu, Shimei He, Guanghong Huang   

  1. Beijing Institute of Aeronautical Materials, Beijing 100095, China
  • Received:2009-02-17 Revised:2008-07-18 Online:2009-11-28 Published:2009-11-24
  • Contact: Limin He

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摘要：

The high-temperature oxidation behaviors of the NiCrAlYSi/P-YSZ thermal barrier coatings (TBCs) produced by electron beam-physical vapor deposition (EB-PVD) on directionally solidified (DS) and single crystalline (SC) Ni-based superalloy substrates were investigated. The cross-sectional microstructure investigation, isothermal and cyclic oxidation tests were conducted for the comparison of oxidation behaviors of TBCs on different substrates. Although a TBC on DS substrate has a relatively higher oxidation rate, it has a longer thermal cycling lifetime than on SC substrate. The primary factor for TBC spallation is the mismatch of thermal expansion coefficients (TEC) of the bond coat and substrate. The morphological feature of thermally grown oxide (TGO) has a strong influence on the TBC performance. By optimizing the elemental interdiffusion between bond coat and substrate, a high quality TGO layer is formed on the DS substrate, and therefore the TBC oxidation behavior is improved.

关键词: Thermal barrier coatings, Thermally grown oxide, Electron beam-physical vapor deposition, Single crystalline super alloy, Directionally solidified super alloy

Abstract:

The high-temperature oxidation behaviors of the NiCrAlYSi/P-YSZ thermal barrier coatings (TBCs) produced by electron beam-physical vapor deposition (EB-PVD) on directionally solidified (DS) and single crystalline (SC) Ni-based superalloy substrates were investigated. The cross-sectional microstructure investigation, isothermal and cyclic oxidation tests were conducted for the comparison of oxidation behaviors of TBCs on different substrates. Although TBC on DS substrate has a relatively higher oxidation rate, it has a longer thermal cycling lifetime than that on SC substrate. The primary factor for TBC spallation is the mismatch of thermal expansion coefficient (TEC) of the bond coat and substrate. The morphological feature of thermally grown oxide (TGO) has a strong influence on the TBC performance. By optimizing the elemental interdiffusion between bond coat and substrate, a high quality TGO layer is formed on the DS substrate, and therefore the TBC oxidation behavior is improved.

Key words: Thermal barrier coatings, Thermally grown oxide, Electron beam-physical vapor deposition, Single crystalline superalloy, Directionally solidified superalloy