摘要
铝硅酸盐陶瓷因低热导率、高熔点、出色的化学稳定性和抗热震性,在隔热材料中占据了重要地位。近年来,铝硅酸盐陶瓷被进一步开发应用于高温应用和燃气涡轮发动机等部件。本文采用溶胶-凝胶法制备了前驱体粉末,通过高熵工程掺杂多种稀土元素,制备了特定的高熵稀土铝硅酸盐陶瓷(Y_(1/6)Yb_(1/6)Pr_(1/6)Sm_(1/6)Dy_(1/6)Al_(1/6))_(2)Si_(2)O_(7)。研究了离子半径和烧结温度对其物相组成、微观结构和热物理性能的影响。研究结果表明,在等摩尔比的条件下制备的(Y_(1/6)Yb_(1/6)Pr_(1/6)Sm_(1/6)Dy_(1/6)Al_(1/6))_(2)Si_(2)O_(7),综合性能优异,500℃时,最低导热系数达到0.18W·m^(-1)·K^(-1),1200℃时热膨胀系数为3.9×10^(-6) K^(-1)。本研究结果可为高熵陶瓷的发展及其在包装中的应用提供参考。
Aluminosilicate ceramics occupy a pivotal position in thermal insulation materials due to their low thermal conductivity,high melting point,exceptional chemical stability,and resistance to thermal shock.In recent years,aluminosilicate ceramics have been further developed for applications in high-temperature environments and components such as gas turbine engines.This study aims to prepare precursor powders via the sol-gel method and synthesize a specific high-entropy rare-earth aluminosilicate ceramic(Y_(1/6)Yb_(1/6)Pr_(1/6)Sm_(1/6)Dy_(1/6)Al_(1/6))_(2)Si_(2)O_(7),through high-entropy engineering with doping of multiple rare-earth elements.The influences of ionic radius and sintering temperature on its phase composition,microstructure,and thermophysical properties were investigated.The research results indicate that(Y_(1/6)Yb_(1/6)Pr_(1/6)Sm_(1/6)Dy_(1/6)Al_(1/6))_(2)Si_(2)O_(7)prepared under equimolar conditions exhibits superior comprehensive properties,with a minimum thermal conductivity of 0.18W/m/K at 500℃and a thermal expansion coefficient of 3.9×10^(-6)/K at 1200℃.This study could provide some reference for the development of high-entropy ceramics and their applications in packaging.
作者
朱泓颖
张俊
李优辉
王思
陈晓莹
吴若梅
ZHU Hongying;ZHANG Jun;LI Youhui;WANG Si;CHEN Xiaoying;WU Ruomei(College of Packaging and Materials Engineering,Hunan University of Technology,Zhuzhou 412007,China)
出处
《化工技术与开发》
2025年第5期17-21,共5页
Technology & Development of Chemical Industry
基金
2024湖南省大学生创新训练重点项目(S202411535001)。
关键词
高熵陶瓷
稀土铝硅酸盐
隔热包装
热学性能
high entropy ceramics
rare earth aluminum silicate
heat insulation packaging
thermal properties
