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Home > Archive>Volume 52, Issue 2, 2023 >470-477. DOI:10.12442/j.issn.1002-185X.20220391
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Failure Modes of High Temperature Protective Coating for Aircraft APU Turbine Guide Vanes
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Affiliation:

1.Shenyang University of Technology, Shenyang 110870, China;2.China Southern Airlines, Shenyang 110169, China;3.Tianjin Key Laboratory of Civil Aircraft Airworthiness and Maintenance, Civil Aviation University of China, Tianjin 300300, China

Fund Project:

Scientific Research Project of Tianjin Municipal Education Commission (2020KJ016); Opening Fund of Tianjin Provincial and Ministerial Scientific Research Institution (TKLAM202202)

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    Abstract:

    The structural characteristics and thermal protection mechanism of a certain type of auxiliary power unit (APU) turbine guide vane in service were analyzed by scanning electron microscope (SEM) and energy dispersive analyzer (EDS). Then, the thickness variation and failure mode of the high temperature protective coating after removal from aircraft were investigated. The results show that there are two different coating structures in the aircraft APU guide vanes: aluminized coating+MCrAlY coating and mono aluminized coating. The MCrAlY coating thickness of the scrapped APU guide vane components increases first and then decreases from the area of trailing edge to the pressure side and then to the leading edge. Affected by the configuration and the service environment of APU guide vanes, the coatings at the trailing edge and pressure side present an oxidation-predominant damage mode. The oxidation degree of the coating on the trailing edge is more serious, while the closer the pressure-side region to the leading edge, the less severe the oxidative damage. However, due to the coupling effect of CMAS (CaO, MgO, Al2O3, SiO2) corrosion and high temperature oxidation, the damage to the coating at the leading edge of vanes is the most serious.

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[Wang Lulu, Liu Yankuan, Fei Yujie, Wang Yuansheng, Zhan Jinying, Wang Zhiping. Failure Modes of High Temperature Protective Coating for Aircraft APU Turbine Guide Vanes[J]. Rare Metal Materials and Engineering,2023,52(2):470~477.]
DOI：10.12442/j. issn.1002-185X.20220391

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History
  • Received:May 06,2022
  • Revised:February 03,2023
  • Adopted:August 11,2022
  • Online: March 03,2023
  • Published: February 28,2023

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