In-situ reaction synthesis Al2O3 overlay modified 7YSZ TBC for NaCl hot corrosion

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Jia-Feng Fan
  • Xue-Shi Zhuo
  • Xiao-Feng Zhang
  • Jun-Li Feng
  • Wo Jiang
  • Yan-Qing Jiang
  • Ju-Hang Yin
  • Bing He
  • Yong-Jun Hu
  • Rong-Jiu Li
  • Shuang-Quan Guo
  • Huan-Tao Chen
  • Chun-Ming Deng
  • Min Liu
  • Ke-Song Zhou

Detail(s)

Original languageEnglish
Pages (from-to)22404-22415
Journal / PublicationCeramics International
Volume47
Issue number16
Online published12 May 2021
Publication statusPublished - 15 Aug 2021

Abstract

Thermal barrier coatings (TBCs) are facing the challenge of chloride salt hot corrosion in the marine environment. In the manuscript, 7YSZ feather-like columnar structure coatings were prepared by plasma spray-physical vapor deposition (PS-PVD). The Al2O3-modification based on in-situ synthesis was used as the strategy to improve the hot corrosion resistance of the coating. Then, the coatings were subjected to test of 900 °C NaCl thermal exposure and combustion gas-salt spray ablation. The microstructure and phase evolution results of the coatings show that NaCl has a strong corrosive effect on the as-sprayed PS-PVD TBC and leading to catastrophic oxidation. In contrast to this, the Al2O3-modified coating shows good corrosion resistance. In the hot corrosion behavior of NaCl, the metal elements in the bond layer are rapidly oxidized and accumulated on the surface of TGO layer through the electrochemical corrosion mechanism, which makes the TGO thicken rapidly. After combustion gas-salt spray corrosion, the YSZ coatings sintered and the evolution of mechanical properties were analyzed. Compared with the initial sprayed state, the hardness of the as-sprayed coating and the Al2O3-modified coating increased by 13.04 GPa and 11.47 GPa, respectively. And the elastic modulus of as-sprayed coating and Al2O3-modified coating increased by 133.00 GPa and 129.60 GPa, respectively.

Research Area(s)

  • Al2O3-Modification, Marine environment, NaCl hot Corrosion, Plasma spray-physical vapor deposition

Citation Format(s)

In-situ reaction synthesis Al2O3 overlay modified 7YSZ TBC for NaCl hot corrosion. / Fan, Jia-Feng; Liu, Guo; Zhuo, Xue-Shi; Zhang, Xiao-Feng; Feng, Jun-Li; Jiang, Wo; Jiang, Yan-Qing; Yin, Ju-Hang; He, Bing; Hu, Yong-Jun; Li, Rong-Jiu; Guo, Shuang-Quan; Chen, Huan-Tao; Deng, Chun-Ming; Liu, Min; Zhou, Ke-Song.

In: Ceramics International, Vol. 47, No. 16, 15.08.2021, p. 22404-22415.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review