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Home > Archive>Volume 51, Issue 11, 2022 >3981-3988. DOI:10.12442/j.issn.1002-185X.20211112
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Corrosion Resistance of Al2O3 Coating Prepared by Filtered Cathodic Vacuum Arc for Thermal Barrier Coatings Against CMAS Degradation
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Affiliation:

1.Surface Engineering Research Institute, Chinese Academy of Agricultural Mechanization Sciences, Beijing 100083, China;2.Beijing Golden Weel Special Machine Co., Ltd, Beijing 100083, China

Fund Project:

National Science and Technology Major Project (2017-VII-0007-0100)

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    Abstract:

    To improve the deposit (the main components are CaO, MgO, Al2O3, and SiO2, together referred to as CMAS) corrosion resistance of thermal barrier coatings (TBCs), the filtered cathodic vacuum arc (FCVA) technique was adopted to prepare a dense Al2O3 coating on the surface of TBCs. The wetting behavior and CMAS corrosion resistance of Al2O3-modified TBCs and as-deposited TBCs were compared and analyzed. Results show that the preparation of Al2O3 coating by FCVA technique has no obvious influence on the structure of 7wt% yttria-stabilized zirconia (7YSZ) phase. Besides, the Al2O3-modified TBCs have better comprehensive performance compared with the as-deposited TBCs. Under the CMAS corrosion at 1250 °C, the Al2O3 coating effectively restricts the spread of molten CMAS on TBC surface. In addition, the Al2O3 coating fills the gaps between 7YSZ columnar crystals and hinders the infiltration of molten CMAS. It is proved that FCVA method is appropriate to Al2O3 coating preparation in order to improve the CMAS corrosion resistance of TBCs, and the Al2O3 coating and its preparation do not have negative influence on the thermal shock performance of TBCs.

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[Liu Tao, He Qing, Li Dan. Corrosion Resistance of Al2O3 Coating Prepared by Filtered Cathodic Vacuum Arc for Thermal Barrier Coatings Against CMAS Degradation[J]. Rare Metal Materials and Engineering,2022,51(11):3981~3988.]
DOI：10.12442/j. issn.1002-185X.20211112

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History
  • Received:December 13,2021
  • Revised:June 04,2022
  • Adopted:July 11,2022
  • Online: December 07,2022
  • Published: November 30,2022

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