高熵铁弹性稀土钽酸盐热障涂层材料:(Y_(0.2)Dy_(0.2)Sm_(0.2)Yb_(0.2)Er_(0.2))TaO_(4)  

High-Entropy Ferroelastic Rare-earth Tantalate Thermal Barrier Coating Material:(Y_(0.2)Dy_(0.2)Sm_(0.2)Yb_(0.2)Er_(0.2))TaO_(4)

作　　者：汪俊 种晓宇 冯晶[1] 张敏 杨渊 李东坡 赵子樊 WANG Jun;CHONG Xiaoyun;FENG Jing;ZHANG Min;YANG Yuan;LI Dongpo;ZHAO Zifan(Faculty of Material Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China;Yunnan Copper Company Limited,Southwest Copper Branch,Kunming 650000,China)

机构地区：[1]昆明理工大学材料科学与工程学院,昆明650093 [2]云南铜业股份有限公司西南铜业分公司,昆明650000

出　　处：《硅酸盐学报》2022年第6期1481-1488,共8页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(91960103,51762028)。

摘　　要：热障涂层的作用在于为先进航空发动机热端部件提供热防护,保障其在高温环境中安全服役。低热导率和高断裂韧性一直是新型热障涂层材料选择的关键性能指标。本工作通过固相反应合成了一种性能优异的高熵稀土钽酸盐陶瓷(Y_(0.2)Dy_(0.2)Sm_(0.2)Yb_(0.2)Er_(0.2))TaO_(4)((5RE_(0.2))TaO_(4))。结果表明:(5RE_(0.2))TaO_(4)具有较低的热导率(1.68 W·m^(-1)·K^(-1)@900℃)和较高的热膨胀系数(10.0×10^(-6) K^(-1)@1200℃)。此外,由于独特的铁弹增韧效应,(5RE_(0.2))TaO_(4)具有较高的断裂韧性(2.6 MPa·m^(1/2))和较低的脆性指数(2.1μm^(-1/2))。鉴于高熵稀土钽酸盐陶瓷优异的综合性能,(5RE_(0.2))TaO_(4)在热障涂层材料领域具有良好的应用前景。The function of thermal barrier coating is to protect the hot components of advanced aero-engines from hot corrosion and ensures the hot components service in high-temperature environment safely.In general,a low thermal conductivity and a high fracture toughness are the key performance indexes for the selection of novel thermal barrier coating materials.In this work,a high-entropy rare-earth tantalate ceramic of(Y_(0.2)Dy_(0.2)Sm_(0.2)Yb_(0.2)Er_(0.2))TaO_(4)(i.e.(5RE_(0.2))TaO_(4))with the superior properties was synthesized via solid-state reaction.The results indicate that(5RE_(0.2))TaO_(4) exhibits a low thermal conductivity(i.e.,1.68 W·m^(-1)·K^(-1)@900℃)and a high thermal expansion coefficient(i.e.,10.0×10^(-6) K^(-1)@1200℃).(5RE_(0.2))TaO_(4) shows a high fracture toughness(i.e.,2.6 MPa·m^(1/2))and a low brittleness index(i.e.,2.1μm^(-1/2))because of the unique ferroelastic toughening effect.In addition,(5RE_(0.2))TaO_(4) also has a promising application prospect as one of thermal barrier coating materials.

关 键 词：稀土钽酸盐陶瓷 高熵陶瓷 热障涂层 铁弹增韧效应 

分 类 号：TG174.45[金属学及工艺—金属表面处理] TQ174[金属学及工艺—金属学]