Microstructure and properties of Re-modified NiCoCrAlY bond coating alloy

Zhendong CHANG, Jing ZHANG, Wenbin XIN, Rende MU, Xiwen SONG, Yan CAI

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Journal of Materials Engineering ›› 2025, Vol. 53 ›› Issue (6) : 35-43. DOI: 10.11868/j.issn.1001-4381.2024.000863
REPAIR TECHNOLOGY OF AERO-ENGINE AND GAS TURBINE BLADES COLUMN

Microstructure and properties of Re-modified NiCoCrAlY bond coating alloy

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Abstract

The phase constitution and properties of MCrAlY bond coating material are essential to improve the service stability and life of thermal barrier coatings for turbine blades. In this work， the microstructure characteristics， thermal expansion and high-temperature oxidation resistance of the Re-modified NiCoCrAlY bond coating alloy are systematically investigated using Thermo-Calc software， X-ray diffraction， field emission scanning electron microscopy， transmission electron microscopy， and thermal dilatometer， etc. The results show that the microstructure is primarily composed of β-NiAl coupled with some σ-CoCr， α-Cr and Ni5Y. Meanwhile， the rare earth element Y binding Ni forms Ni5Y， while the modification element Re is mostly solid dissolved in the α-Cr and σ-CoCr phases. Moreover， when the temperature increases from room temperature to 1200 ℃， the coefficient of thermal expansion reaches （18.1±0.1）×10-6 K-1. As the isothermal oxidation time at 1100 ℃ extends to 100 h， the thickness of the oxidation layer and Al depletion layer is （2.44±0.09） μm and （2.53±0.33） μm， respectively. The oxidation rate is （0.06±0.01） g·m-2·h-1， achieving the oxidation rate of a complete antioxidant level. Compared with the properties of the conventional MCrAlY bond coating alloy， the coefficient of thermal expansion at 1200 ℃ and the oxidation rate at 1100 ℃ for 100 h decrease by 12% and 25%， respectively. Namely， the Re-modified NiCoCrAlY bond coating alloy processes lower thermal expansion and higher oxidation resistance， which can provide design strategy for developing a high-property bond coating material.

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NiCoCrAlY bond coating material / Re modification / thermal expansion / high-temperature oxidation resistance

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Zhendong CHANG , Jing ZHANG , Wenbin XIN , et al . Microstructure and properties of Re-modified NiCoCrAlY bond coating alloy. Journal of Materials Engineering. 2025, 53(6): 35-43 https://doi.org/10.11868/j.issn.1001-4381.2024.000863

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