Phase Composition and Structure and High-temperature Oxidation Resistance of the Hf-modified MCrAlY Bond Coating Alloy
FANG Pinxi1, ZHANG Jing1,*, XIN Wenbin1, CHANG Zhendong2, SONG Xiwen1, MU Rende2
1 School of Rare Earth Industry (School of Rare Earth Engineering and Technology), Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China 2 AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China
Abstract: The high-temperature oxidation resistance of bond coating alloys largely depends on phase composition and structure, directly affecting the service performance and life of thermal barrier coatings they prepared. In this work, the phase composition and structure, isothermal oxidation behavior at 1 100 ℃ and Hf distribution characteristics of the Hf-modified MCrAlY bond coating alloy were comprehensively investigated through Thermo-Calc and FactSage thermodynamic calculations, coupled with X-ray diffraction, field emission scanning electron microscopy and electron probe microanalysis, etc. The obtained results showed that the equilibrium phase composition of the bond coating alloy at 400 ℃ was primarily FCC_L12 structured γ′-Ni3Al and some BCC_B2 structured β-NiAl and α-Cr. The phase transformation of γ′-Ni3Al+α-Cr→β-NiAl+γ-Ni happened at 857 ℃, and the dominant phase composition changed into β-NiAl and FCC_L12 structured γ-Ni. Under nonequilibrium conditions, the matrix phase at room temperature consisted of β-NiAl and some γ′-Ni3Al, and the precipitated phase was α-Cr. Moreover, the average mass gain gradually increased from (5.83±0.515) g·m-2 to (9.42±0.355) g·m-2, while the oxidation rate continuously decreased from (0.23±0.021) g·m-2·h-1 to (0.09±0.004) g·m-2·h-1 as the oxidation time increased from 25 h to 100 h. Furthermore, the fitting results indicated that the kinetic characteristics of isothermal oxidation could be accurately described by a parabolic model, and the stable oxidation was divided into two stages. In the first stage ranging from 10 h to 50 h, the oxidation rate constant kp was equal to 1.797 g2·m-4·h-1, and the value obviously decreased to 0.262 g2·m-4·h-1 in the second stage of 50—100 h. In addition, the modifying element Hf was primarily distributed at the interface of β-NiAl and γ′-Ni3Al and brought about the stable formation of HfO2 within the oxidation layer, which could not only effectively restrain the diffusion of Al and O, but also exert a pinning effect, consequently improving the oxidation resistance of the bond coating alloys and the anti-pee-ling property of the oxidation layer. Notably, the unevenly distributed Hf in the alloy easily resulted in large-sized HfO2, which caused local internal oxidation.
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2025, Vol. 39 
