Sc_(2)O_(3)和Y_(2)O_(3)复合掺杂ZrO_(2)热障涂层陶瓷材料的组织结构与力学性能  

Microstructure and mechanical properties of Sc_(2)O_(3)-Y_(2)O_(3)co-doped ZrO_(2)ceramic materials for thermal barrier coating

作　　者：王志刚 刘仍谦[1] 谢敏 张永和 王炫力[1,2] 宋希文 常振东 刘德林[3] 牟仁德 WANG Zhigang;LIU Rengqian;XIE Min;ZHANG Yonghe;WANG Xuanli;SONG Xiwen;CHANG Zhendong;LIU Delin;MU Rende(School of Materials Science and Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia,China;Key Laboratory of Green Extraction&Efficient Utilization of Light Rare-Earth Resources(Ministry of Education)Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia,China;AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China)

机构地区：[1]内蒙古科技大学材料科学与工程学院,内蒙古包头014010 [2]轻稀土资源绿色提取与高效利用教育部重点实验室(内蒙古科技大学),内蒙古包头014010 [3]中国航发北京航空材料研究院,北京100095

出　　处：《材料工程》2024年第6期139-146,共8页Journal of Materials Engineering

基　　金：国家自然科学基金(52372062,52204316);内蒙古自治区高等学校“青年科技英才支持计划”项目(NJYT23006)。

摘　　要：质量分数为7±1%氧化钇部分稳定氧化锆(7YSZ)是广泛应用的热障涂层陶瓷材料。然而,其在1200℃以上长期服役存在相稳定性差、烧结加剧和力学性能下降等弊端。因此,本工作提出新型Sc_(2)O_(3)-Y_(2)O_(3)协同掺杂ZrO_(2)热障涂层陶瓷材料,采用固相合成法制备了摩尔分数为7.5%Sc_(2)O_(3)-x%Y_(2)O_(3)-(92.5-x)%ZrO_(2)(x=0,0.1,0.2,0.3)陶瓷。通过X射线衍射仪(XRD)、场发射扫描电镜(SEM)等手段,重点探究Y_(2)O_(3)掺杂含量对高温固相合成陶瓷材料的微观组织结构演变行为以及维氏硬度、断裂韧性、弹性模量和三点抗弯强度等力学性能的影响规律。结果表明:Sc_(2)O_(3)-Y_(2)O_(3)复合掺杂ZrO_(2)陶瓷材料经1450℃×3.5 h高温烧结的致密度大于97%,主要由四方相结构组成,该材料的维氏硬度、弹性模量、断裂韧性和三点抗弯强度与传统8YSZ相当,分别为13~14 GPa,211~214 GPa,6.5~7.0 MPa·m^(1/2),520~850 MPa之间;断裂机制主要为穿晶断裂和沿晶断裂的混合方式,其中以穿晶断裂为主导。Sc_(2)O_(3)-Y_(2)O_(3)复合掺杂ZrO_(2)陶瓷可作为一种潜在的高温热障涂层陶瓷材料。Partially stabilized zirconia(7YSZ)with a mass fraction of 7±1%yttrium oxide is a widely used ceramic material for thermal barrier coatings.However,its phase stability,sintering resistance,and mechanical properties decreased during the long-time operation above 1200℃.A new type of Sc_(2)O_(3)-Y_(2)O_(3)co-doped ZrO_(2)thermal barrier coating ceramic material was proposed,and a molar fraction of 7.5%Sc_(2)O_(3)-x%Y_(2)O_(3)-(92.5-x)%ZrO_(2)(x=0,0.1,0.2,0.3)ceramics were prepared by solid-state reaction method.The effects of Y_(2)O_(3)doping on the microstructural,phase evolution,and mechanical properties(including Vickers hardness,fracture toughness,elastic modulus and three-point bending strength)were explored by XRD,SEM,and other testing methods.The results show that the relative density of Sc_(2)O_(3)-Y_(2)O_(3)doped ZrO_(2)ceramics sintered at 1450°C for 3.5 h is more than 97%,and the phase structure is composed of tetragonal phase.Compared with 6-8YSZ ceramics,Sc_(2)O_(3)-Y_(2)O_(3)doped ZrO_(2)ceramics exhibit similar Vickers hardness(13-14 GPa),fracture toughness(6.5-7.0 MPa·m^(1/2)),elastic modulus(211-214 GPa)and three-point bending strength(520-850 MPa).Fracture mechanism shows a mixture of transgranular and intergranular fracture modes,in which transgranular fracture is dominant.This ceramic can be explored as a potential thermal barrier coating material for high-temperature applications.

关 键 词：热障涂层 稀土掺杂 氧化锆 氧化钪 微观组织 力学性能 

分 类 号：TQ174.75[化学工程—陶瓷工业] TB3[化学工程—硅酸盐工业]