[1]魏晓薇,董琳,张小锋,等.熔渗铝致密化环境障涂层的抗热循环性能研究[J].中国材料进展,2025,44(02):125-133.[doi:10.7502/j.issn.1674-3962.202409005]
　WEI Xiaowei,DONG Lin,ZHANG Xiaofeng,et al.Thermal Cycling Resistance of Aluminum-Infiltration-Densified Environmental Barrier Coatings[J].MATERIALS CHINA,2025,44(02):125-133.[doi:10.7502/j.issn.1674-3962.202409005]
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熔渗铝致密化环境障涂层的抗热循环性能研究()
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中国材料进展[ISSN:1674-3962/CN:61-1473/TG]

卷:
44
期数:
2025年02
页码:
125-133
栏目:
出版日期:
2025-02-28

文章信息/Info

Title:
Thermal Cycling Resistance of Aluminum-Infiltration-Densified Environmental Barrier Coatings
文章编号:
1674-3962(2025)02-0125-09
作者:
魏晓薇; 董琳; 张小锋; 杨冠军
1. 西安交通大学 金属材料强度国家重点实验室，陕西 西安 710049 2. 广东省科学院 新材料研究所，广东 广州 510650
Author(s):
WEI Xiaowei;  DONG Lin;  ZHANG Xiaofeng;  YANG Guanjun
1.State Key Laboratory for Mechanical Behavior of Materials, Xi‘an Jiaotong University, Xi’an 710049, China 2. Institute of New Materials, Guangdong Academy of Science, Guangzhou 510650, China
关键词:
环境障涂层（EBCs）; 致密化; 熔渗; 纵向裂纹; 抗热循环性能
Keywords:
environmental barrier coatings (EBCs); densification; infiltration; vertical crack; thermal cycling resistance
分类号:
TG174.4;V263
DOI:
10.7502/j.issn.1674-3962.202409005
文献标志码:
A
摘要:
环境障涂层（environmental barrier coatings，EBCs）是碳化硅纤维增强碳化硅陶瓷基复合材料（SiCf/SiC CMCs）在航空发动机热端部件应用的关键，但在制备过程中EBCs难以避免地产生表面裂纹及孔隙，成为发动机环境水氧等腐蚀介质的快速扩散通道，因此，制备致密的EBCs是提高SiCf/SiC复合材料抗腐蚀性能的关键。此外，为保证高低温循环服役条件下的持久性，EBCs需具备优异的抗热循环性能。采用熔渗铝封孔的方法获得致密化EBCs，研究了涂层在1050 ℃~室温热循环条件下的结构演变规律，揭示了致密化处理对涂层抗热循环性能的影响机制。结果表明，熔渗铝封孔法消除了喷涂态EBCs的表面裸露孔隙，并在表面形成镱铝石榴石（YbAG）原位反应层；在热循环过程中，喷涂态涂层内应力逐渐累积，致使纵向裂纹数量增多，裂纹间距减小；熔渗铝时的热处理过程显著提高了EBCs内应力，促使裂纹早期生长和扩展，裂纹数量和间距与喷涂态EBCs热循环200次后的相当，且在热循环过程中裂纹未新增和扩展。本研究为耐热循环熔渗铝致密化EBCs的制备提供了实验数据支撑。
Abstract:
Environmental barrier coatings (EBCs) are crucial for the application of silicon carbide fiber-reinforced silicon carbide ceramic matrix composites (SiCf/SiC CMCs) in hot end components of aircraft engines. However, during the coating preparation process, it is difficult to avoid surface cracks and pores, which become rapid diffusion channel for corrosive media such as water and oxygen in the engine environment. Therefore, preparing densified EBCs is the key to improve SiCf/SiC CMCs corrosion resistance. Additionally, to ensure durability under cycling conditions with the high and low temperature changes,distinguished thermal cycling resistance is essential for EBCs. This study used the method of aluminum-infiltration to obtain densified EBCs, and investigated the structural evolution of the coating under 1050 ℃~room temperature thermal cycling, revealing the influence mechanism of densification treatment on the thermal cycling resistance of the coating. The results indicated that the aluminum-infiltration-densified method eliminated the surface exposed pores of the sprayed EBCs and formed an in-situ reaction layer of ytterbium aluminum garnet (YbAG) on the surface. During the thermal cycling process, the internal stress of the sprayed EBCs gradually accumulated, resulting in an increase in the number of vertical cracks and a decrease in crack spacing. The heat treatment of aluminum-infiltration process significantly increased the internal stress of EBCs, promoting early crack growth and propagation, the number and spacing of cracks were comparable to those of sprayed EBCs after 200 thermal cycles, and no new or extended cracks were observed during the thermal cycling. Therefore, this study provides experiment data support for the preparation of thermal cycling resistant aluminuminfiltration-densified EBCs.

备注/Memo

备注/Memo:
收稿日期：2024-09-03修回日期：2024-10-21 基金项目：国家自然科学基金资助项目（52301102） 第一作者：魏晓薇，女，2000年生，硕士研究生 通讯作者：董琳，女，1988年生，助理教授， Email：donglin@xjtu.edu.cn
更新日期/Last Update: 2025-01-21