无压烧结制备(Y_(0.2)Gd_(0.2)Er_(0.2)Yb_(0.2)Lu_(0.2))_(2)Zr_(2)O_(7)高熵陶瓷及其高温抗CMAS腐蚀性能  

Pressureless Sintering of(Y_(0.2)Gd_(0.2)Er_(0.2)Yb_(0.2)Lu_(0.2))_(2)Zr_(2)O_(7) High-entropy Ceramic and Its High Temperature CMAS Corrosion Resistance

作　　者：樊文楷 杨潇[1] 李宏华 李永[1] 李江涛[1] FAN Wenkai;YANG Xiao;LI Honghua;LI Yong;LI Jiangtao(Key Laboratory of Cryogenic Science and Technology,Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院理化技术研究所,低温工程重点实验室,北京100190 [2]中国科学院大学,北京100049

出　　处：《无机材料学报》2025年第2期159-167,共9页Journal of Inorganic Materials

基　　金：国家自然科学基金(92263205)。

摘　　要：稀土锆酸盐(Rare-earthzirconate,REZ)比传统钇稳定氧化锆(Yttrium stabilized zirconate,YSZ)材料更能抵抗环境中的钙镁铝硅氧化物(CMAS)腐蚀,因此在热障涂层领域受到关注。研究表明,对锆酸盐类材料进行高熵化设计是提升其高温抗CMAS腐蚀性能的有效方法。本工作采用固相反应法合成了单相缺陷萤石结构的(Y_(0.2)Gd_(0.2)Er_(0.2)Yb_(0.2)Lu_(0.2))_(2)Zr_(2)O_(7)高熵稀土锆酸盐(High-entropy rare-earth zirconate,HE-REZ)粉体,并将无压烧结(Pressureless sintering,PLS)与冷等静压(Cold isostatic pressing,CIP)技术相结合高效制备了块体样品,表征了样品的物相组成、微观结构、元素分布、热学性能、力学性能,重点研究了抗CMAS腐蚀性能。实验结果表明:CIP+PLS工艺可获得相对密度为98.6%的样品,在1300℃、CMAS腐蚀条件下其腐蚀深度仅为7YSZ的2.6%、锆酸钆(GZO)的22.6%。REZ优异的化学稳定性再加上高熵化带来的迟滞扩散效应,极大提升了样品的抗CMAS腐蚀性能。此外,相比于GZO,HE-REZ具有更高的硬度与杨氏模量、更大的线膨胀系数、更低的热导率,使得其力学、热学性能优于GZO。本研究制备的(Y_(0.2)Gd_(0.2)Er_(0.2)Yb_(0.2)Lu_(0.2))_(2)Zr_(2)O_(7)高熵陶瓷在热障材料领域显示出良好的应用前景。Rare-earth zirconates(REZs)have attracted attention in the field of thermal barrier materials because they are more resistant to calcium-magnesium-aluminum-silicon oxide(CMAS)corrosion than yttria stabilized zirconia(YSZ).High-entropy design of zirconates is an effective method to enhance CMAS corrosion resistance,but currently the ability of its corrosion resistance still does not meet the growing requirement.In this work,a solid-state reaction technique was used to synthesize high-entropy rare-earth zirconate(HE-REZ)(Y_(0.2)Gd_(0.2)Er_(0.2)Yb_(0.2)Lu_(0.2))_(2)Zr_(2)O_(7) powder with a single-phased defect fluorite structure,and pressureless sintering(PLS)combined with cold isostatic pressing(CIP)technique was used to efficiently prepare bulk samples.The phase composition,microstructure,element distribution,thermal and mechanical properties were studied,focusing on the CMAS corrosion resistance.According to the results,under the same CMAS corrosion environment at 1300℃,the corrosion depth of HE-REZ with a relative density of 98.6%is only 2.6%of 7YSZ and 22.6%of Gd2Zr_(2)O_(7)(GZO).The synergistic effect of zirconates'chemical inertness and high-entropy materials'sluggish diffusion accounts for this exceptional corrosion resistance.The obtained HE-REZ shows higher hardness and Young's modulus,larger coefficient of linear expansion,and lower thermal conductivity than ever,making its mechanical and thermal properties superior to GZO.All these outcomes demonstrate the good application potential of(Y_(0.2)Gd_(0.2)Er_(0.2)Yb_(0.2)Lu_(0.2))_(2)Zr_(2)O_(7) in the field of thermal barrier materials.

关 键 词：高熵陶瓷 热障材料 锆酸盐 无压烧结 抗CMAS腐蚀性能 

分 类 号：TQ174[化学工程—陶瓷工业]