稀土锆酸盐热障涂层的相稳定性和界面结合性能研究*

doi:10.13385/j.cnki.vacuum.2021.04.03

Abstract

Abstract: The four LZ, LZ3Y, LZ7C3 and YSZ thermal barrier coatings (TBCs)were fabricated via electron beam physical vapor deposition (EB-PVD). The high temperature phase stability, interficial bonding strength and cyclic oxidation behavior of three types of rare earth zirconates and YSZ TBCs were investigated. The phase constituent, phase structural stability, morphology and chemical composition of the four TBCs were systematically analyzed by XRD, SEM and EDS. The results indicate that the diffraction peaks belonging to the LZ, LZ3Y and LZ7C3 coating powders, which gradually shift to the larger 2θ-value after long-term thermal exposure at 1300℃. The excessive phases including of La₂O₃, t-ZrO₂ and CeO₂ coexisted in the ceramic coatings also have produced the solid solution phenomenon. The YSZ coating appears two monoclinic diffraction peaks and the intensities of these two peaks slightly increase to a certain extent. After 336h in room temperature air, the LZ coating exhibits lamellar delamination. The averaged interfacial bonding strength of YSZ coating is the highest, while that of LZ coating is the lowest. Meanwhile, the thermal cycling lives of three rare earth zirconates TBCs are lower than that of YSZ coating. It is proably related to the excess of La₂O₃ contained in the three new TBCs. La₂O₃ is easy to chemically react with H₂O or CO₂ in air, which further leads to volume expansion, weakens the inferfacial adhesion between the ceramic coat and bond coat and decreases the thermal cycling lifetime of the coaings.

Key words: rare earth zirconate, thermal barrier coatings, phase structure, bonding strength, thermal cycling lifetime

CLC Number:

TG17

BAI Ming-yuan, WANG Xin, ZHEN Zhen, MU Ren-de, HE Li-min, XU Zhen-hua. Phase Stability and Interfacial Bonding Strength of Rare Earth Zirconate Novel Thermal Barrier Coatings[J].VACUUM, 2021, 58(4): 12-20.

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Phase Stability and Interfacial Bonding Strength of Rare Earth Zirconate Novel Thermal Barrier Coatings

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