(Yb0.25Lu0.25Er0.25Y0.25)2Si2O7高熵硅酸盐热环境障涂层的性能研究
Properties of(Yb0.25Lu0.25Er0.25Y0.25)2Si2O7 High Entropy Silicate Thermal Environmental Barrier Coating
王泽通 1董淑娟 1毛传勇 1蒋佳宁 1邓龙辉 1曹学强1
作者信息
- 1. 武汉理工大学硅酸盐建筑材料国家重点实验室,湖北武汉 430070
- 折叠
摘要
通过高熵化设计制备了一种新型焦硅酸盐涂层材料(Yb0.25Lu0.25Er0.25Y0.25)2Si2O7,采用大气等离子喷涂(APS)在碳化硅纤维增强碳化硅陶瓷复合材料(SiCf/SiC-CMCs)表面制备了(4RE0.25)2Si2O7 一体化热环境障涂层(TEBCs)体系和LaMgAl11O19/Lu2Si2O7热/环境障涂层(T/EBCs)体系.通过研究两种涂层体系的微观结构、热物理性能、水氧腐蚀性能以及热循环寿命等结果发现:APS制备的(4RE0.25)2Si2O7涂层从室温到1500 ℃为稳定的β相,(4RE0.25)2Si2O7涂层不存在成分偏析,热导率和热膨胀系数相对Lu2Si2O7涂层有所降低,更适合作为一体化TEBCs使用;(4RE0.25)2Si2O7 TEBCs体系的水氧腐蚀寿命高于80 h,LaMgAl11O19/Lu2Si2O7 T/EBCs体系的水氧腐蚀寿命低于80h;(4RE0.25)2Si2O7 TEBCs体系的热循环寿命为168次;高熵化设计使焦硅酸盐涂层CTE适配度提高,断裂韧性增强,进而增加了TEBCs体系的热循环寿命.
Abstract
A new pyrosilicate coating material(Yb0.25Lu0.25Er0.25Y0.25)2Si2O7 was prepared by high entropy design.(4RE0.25)2Si2O7 integrated thermal environmental barrier coatings(TEBCs)and LaMgAl11O19/Lu2Si2O7 thermal/en-vironmental barrier coatings(T/EBCs)were prepared by atmospheric plasma spraying(APS)on the surface of silicon carbide fiber reinforced silicon carbide ceramic composites(SiCf/SiC-CMCs)system.By studying the mi-crostructure,thermophysical properties,water-oxygen corrosion properties and thermal cycle life of the two coat-ing systems,it is found that the(4RE0.25)2Si2O7 coating prepared by APS is a stable β phase from room tempera-ture to 1500 ℃,the(4RE0.25)2Si2O7 coating does not have component segregation,the thermal conductivity and thermal expansion coefficient are lower than those of Lu2Si2O7 coating,and it is more suitable for use as integrat-ed TEBCs.The water-oxygen corrosion life of(4RE0.25)2Si2O7 TEBCs system is higher than 80 h,and that of LaMgAl11O19/Lu2Si2O7 T/EBCs system is lower than 80 h.The thermal cycle life of(4RE0.25)2Si2O7 TEBCs system is 168 times.The high entropy design can improve the CTE fit and fracture toughness of the coke silicate coat-ing,and thus increase the thermal cycle life of TEBCs system.
关键词
高熵化设计/热环境障涂层(TEBCs)/相稳定性/高温水氧腐蚀/热循环/焦硅酸盐/稀土Key words
high entropy design/thermal environmental barrier coatings(TEBCs)/phase stability/high temperature water oxygen corrosion/thermal cycle/pyrosilicate/rare earths引用本文复制引用
基金项目
国家自然科学基金项目(52275461)
武汉市应用基础前沿项目(2020010601012177)
出版年
2024
NETL
NSTL
万方数据