NiCrAlYSi粘结层合金相结构与性能研究*

doi:10.13385/j.cnki.vacuum.2022.04.08

真空 ›› 2022, Vol. 59 ›› Issue (4): 41-47.doi: 10.13385/j.cnki.vacuum.2022.04.08

NiCrAlYSi粘结层合金相结构与性能研究^*

常振东¹, 张婧², 牟仁德^1,2, 刘德林¹, 辛文彬², 宋希文²

1. 中国航发北京航空材料研究院,北京 100095;
2. 内蒙古科技大学材料与冶金学院,内蒙古包头 014010

收稿日期:2022-04-20 出版日期:2022-07-25 发布日期:2022-08-09
通讯作者: 牟仁德,研究员。
作者简介:常振东（1988-）,男,山西省晋中市人,硕士。
基金资助:
*国家科技重大专项（项目号J2019-VI-0002）

Phase Structure and Properties of a NiCrAlYSi Bond Coating Alloy

CHANG Zhen-dong¹, ZHANG Jing², MU Ren-de^1,2, LIU De-lin¹, XIN Wen-bin², SONG Xi-wen²

1. AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China;
2. School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, China

Received:2022-04-20 Online:2022-07-25 Published:2022-08-09

摘要/Abstract

摘要： 粘结层合金的热膨胀性和抗高温氧化性与其相结构紧密相关,直接决定着热障涂层的可靠性与涡轮叶片的服役寿命。本文将热力学计算与实验研究相结合,综合分析了NiCrAlYSi粘结层合金的平衡相结构,非平衡条件下的显微组织、元素分布,热膨胀系数随温度的变化规律,以及1100℃等温氧化行为。结果表明,合金室温平衡相组成以FCC_L12结构的γ′-Ni₃Al为主,还有少量BCC_B2结构的α-Cr和β-NiAl相;当温度达到870℃以上时,合金由β-NiAl和γ-Ni相组成。非平衡状态下,合金基体相为γ-Ni+β-NiAl,其中γ-Ni被γ′-Ni₃Al相包裹,β-NiAl相上分布着α-Cr和γ′-Ni₃Al相;元素Si主要固溶在γ′-Ni₃Al相中,分布于晶界处;稀土元素Y以Ni₅Y形式存在为主,亦在晶界处富集。随着温度由100℃升高至1200℃,热膨胀系数由（11.9±0.17）×10^-6K^-1增大到（20.5±0.13）×10^-6K^-1,且当温度达到900℃以上时热膨胀系数增幅显著。1100℃等温氧化样品氧化膜的连续性和致密性较差,且与贫铝层之间存在明显间隙;当等温氧化时间由20h增加至100h,氧化膜厚度由（1.70±0.072）μm增大到（3.28±0.275）μm,贫铝层厚度由（7.48±0.606）μm增大到（10.67±2.654）μm;平均单位面积氧化增重由0.608g·m^-2逐渐增加到3.623g·m^-2,平均氧化速率先由0.030g·m^-2·h^-1减小到0.020g·m^-2·h^-1,后增大到0.036g·m^-2·h^-1,60h对应的平均氧化速率最低。

关键词: NiCrAlYSi粘结层合金, 相结构, 热膨胀性, 抗氧化性

Abstract: The thermal expansion and oxidation resistance of bond coating alloy are closely related to its phase structure, which directly decide the reliability of thermal barrier coating and the service life of turbine blade.In this work, the equilibrium phase structure, the microstructure and element distribution under non-equilibrium condition, the coefficient of thermal expansion(CTE)variation versus temperature, and the isothermal oxidation behavior at 1100℃ of the NiCrAlYSi bond coating alloy were comprehensively investigated by using thermal dynamic calculation and experimental analysis. The results show that the main equilibrium phase constituent is FCC_L12 γ′-Ni₃Al phase, combined with some BCC_B2 α-Cr and β-NiAl at room temperature.When the temperature reaches 870℃, the equilibrium phase changes to β-NiAl and γ-Ni. The non-equilibrium microstructure consists of γ-Ni+β-NiAl. Moreover, the α-Cr and γ′-Ni₃Al precipitate in the β-NiAl matrix and the γ-Ni phase is surrounded by the γ′-Ni₃Al. The element Si primarily solid solutes in γ′-Ni₃Al phase and Y mainly exists in the form of Ni₅Y, both of which are distributed at grain boundaries. The CTE(×10^-6K^-1) is increased from 11.9±0.17 to 20.5±0.13 as the temperature increases from 100℃ to 1200℃, and the increasing rate is obviously larger at the temperature higher than 900℃. The oxidation layer with the poor continuity and density is obtained, which is separated from Al depletion zone. When the oxidation time prolongs from 20h to 100h, the thickness of the oxidation layer increases from (1.70±0.072)μm to (3.28±0.275)μm, and the Al depletion zone thickness increases from （7.48±0.606）μm to（10.67±2.654）μm, respectively. The average weight gain gradually increases from 0.608g·m^-2 to 3.623g·m^-2. The average oxidation rate first decreases from 0.030g·m^-2·h^-1 to 0.020g·m^-2·h^-1, and then increases to 0.036g·m^-2·h^-1, of which the minimum value is obtained at 60h.

Key words: NiCrAlYSi bond coating alloy, phase structure, thermal expansion, oxidation resistance

中图分类号:

TG146.4

常振东, 张婧, 牟仁德, 刘德林, 辛文彬, 宋希文. NiCrAlYSi粘结层合金相结构与性能研究^*[J]. 真空, 2022, 59(4): 41-47.

CHANG Zhen-dong, ZHANG Jing, MU Ren-de, LIU De-lin, XIN Wen-bin, SONG Xi-wen. Phase Structure and Properties of a NiCrAlYSi Bond Coating Alloy[J]. VACUUM, 2022, 59(4): 41-47.

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NiCrAlYSi粘结层合金相结构与性能研究^*

Phase Structure and Properties of a NiCrAlYSi Bond Coating Alloy

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