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VACUUM ›› 2024, Vol. 61 ›› Issue (5): 21-29.doi: 10.13385/j.cnki.vacuum.2024.05.03

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Microstructure and Thermal Cycling Properties of Yb2O3 Modified Gd2Zr2O7 Thermal Barrier Coatings

LI Ting-yue, WANG Xin, ZHEN Zhen, LI Na, XU Zhen-hua   

  1. Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China
  • Received:2024-03-31 Online:2024-09-25 Published:2024-10-10

Abstract: The rare earth composite oxide of （Yb0.1Gd0.9）2Zr2O7 （YbGdZrO） is a candidate material for novel thermal barrier coatings （TBCs）, which can be potentially applied in higher temperatures. Both of single-ceramic-layer YbGdZrO and double-ceramic-layer YbGdZrO/YSZ TBCs were directly fabricated on top of （Ni,Pt）Al bond coat surface via electron beam physical vapor deposition （EB-PVD）. The phase structure, chemical constituent, morphology and thermal cycling behavior of those TBCs were systematically investigated. The results show that the primary phase structure of the as-deposited YbGdZrO ceramic coating is single defective fluorite phase with co-existing of a small amount of Yb2O3. Compared with the single-ceramic-layer coating, each beam of columnar crystal clusters in the sample with double-ceramic-layer TBC is relatively slender, and obvious columnar gain gaps can be observed. The 1100 ℃ thermal cycling lifetime of double-ceramic-layer TBC is about 1.5 folds as that of single-ceramic-layer YbGdZrO coating. After long-term alternating thermal cycling, the transverse microcracks grow in the single-ceramic-layer YbGdZrO coating and extend to several microns above the interface of YbGdZrO/TGO layer, causing interfacial degradation and separation. Moreover, the Yb element contained in single-ceramic-layer has inwardly diffused into the TGO layer. Longitudinal cracks appear within the double-ceramic-layer coating, while both of YbGdZrO/YSZ and YSZ/TGO interfaces remain basically intact. After thermal cycling failure, transverse and vertical microcracks are formed in the TGO layer of the single-ceramic-layer and double-ceramic-layer specimens, and even further induce the phenomenon of intra-layer fracture separation.

Key words: electron beam physical vapor deposition, thermal barrier coating, modified Gd2Zr2O7, thermal cycling, interfacial separation

CLC Number:  T32

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