材料工程2025，Vol.53Issue(6)：35-43,9.DOI:10.11868/j.issn.1001-4381.2024.000863
改性元素Re对NiCoCrAlY黏结层合金组织及性能的影响
Microstructure and properties of Re-modified NiCoCrAlY bond coating alloy
摘要
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.关键词
NiCoCrAlY黏结层合金/Re改性/热膨胀性/抗氧化性Key words
NiCoCrAlY bond coating material/Re modification/thermal expansion/high-temperature oxidation resistance分类
金属材料引用本文复制引用
常振东,张婧,辛文彬,牟仁德,宋希文,蔡妍..改性元素Re对NiCoCrAlY黏结层合金组织及性能的影响[J].材料工程,2025,53(6):35-43,9.基金项目
国家科技重大专项项目(J2019-Ⅶ-0010-0150) （J2019-Ⅶ-0010-0150）
中国航发北京航空材料研究院院基金(KJ42250521) （KJ42250521）
内蒙古自治区高等学校青年科技英才支持计划(NJYT24070) （NJYT24070）
中央引导地方科技发展资金项目(2023ZY0009) （2023ZY0009）
内蒙古自治区教育厅一流学科科研专项项目(YLXKZX-NKD-050) （YLXKZX-NKD-050）
内蒙古自治区直属高校基本科研业务费(118) （118）
