材料工程2025，Vol.53Issue(6)：24-34,11.DOI:10.11868/j.issn.1001-4381.2025.000040
Hf含量对NiCoCrAlY黏结层合金相组成及高温氧化性能影响
Effect of Hf content on phase composition and high-temperature oxidation of NiCoCrAlY alloy
摘要
Abstract
The phase composition and structure play an important role in the high-temperature oxidation resistance of the bonding layer alloy.Furthermore,the high-temperature oxidation resistance of the alloy strongly affects the working life of the thermal barrier coating prepared.In this paper,the effects of different Hf contents on the phase composition,structure,and isothermal oxidation process at 1150℃are investigated by Thermo-Calc,X ray diffraction,and field emission scanning electron microscopy.The results of theoretical calculations and microstructure observations indicate that the phase composition of NiCoCrAlY alloy containing 0.5％(mass fraction,the same below)and 1％Hf are mainly composed of the γ'-Ni3Al phase and the β-NiAl phase.As the Hf content increases from 0.5％to 1％,the liquidus temperature of the alloys decreases from 1422℃to 1418℃,the solidus temperature decreases from 1297℃to 1287℃,and the solidification temperature range increases.Furthermore,the precipitation temperature of the α-Cr phase increases from 860℃to 880℃with increasing Hf content.The β-NiAl phase content of the bonding alloy with 0.5％Hf in the temperature range of 1000-1250℃is higher than that of the alloy with 1.0％Hf.The isothermal oxidation analysis for 200 h shows that the mass gain versus oxidation time curves follow the typical parabolic oxidation kinetics.As the Hf content increases from 0.5％to 1.0％in alloys,the average oxidation rate increases from(0.15±0.008)g·m-2·h-1 to(0.32±0.006)g·m-2·h-1,and the parabolic oxidation rate constant kp increases from 4.163 g2∙m-4∙h-1 to 9.337 g2∙m-4∙h-1.According to the phase analysis and morphology observation of the oxide layer,it is found that the oxide layer is mainly a dense Al2O3 layer;the white contrast HfO2 phase is also distributed in the oxide film.With the increase of Hf content,the distribution of the HfO2 phase in the oxide layer changes from discontinuity to continuousness,and the number and area of HfO2 particles increase.Meanwhile,the internal oxidation degree is aggravated and the thickness of the lean Al layer is improved.关键词
黏结层/高温氧化/Hf改性/相组成/NiCoCrAlY合金Key words
bond coat/high temperature oxidation/Hf modification/phase composition/NiCoCrAlY alloy分类
金属材料引用本文复制引用
薛瑞,张婧,辛文彬,宋希文,常振东,牟仁德,蔡妍..Hf含量对NiCoCrAlY黏结层合金相组成及高温氧化性能影响[J].材料工程,2025,53(6):24-34,11.基金项目
国家科技重大专项项目(J2019-Ⅶ-0010-0150) （J2019-Ⅶ-0010-0150）
中央引导地方科技发展资金项目(2023ZY0009) （2023ZY0009）
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）
内蒙古自治区教育厅一流学科科研专项(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）
