RETa_(3)O_(9)钽酸盐陶瓷的纳米力学性能研究  

Study on the Nanomechanical Properties of RETa_(3)O_(9)Tantalate Ceramics

作　　者：周星 陈琳 李晨宇 陈勋磊 张陆洋 徐浩 冯晶[1] ZHOU Xing;CHEN Lin;LI Chenyu;CHEN Xunlei;ZHANG Luyang;XU Hao;FENG Jing(Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China)

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093

出　　处：《中国材料进展》2025年第3期235-243,225,共10页Materials China

基　　金：云南省重大科技项目(202302AG050010);云南省创新团队项目(202305AS350018);昆明理工大学材料科学与工程学院第二批大学生“踔厉成才”训练计划项目(CLXYCLCC201)。

摘　　要：环境障涂层材料广泛应用于航空发动机和高超声速飞行器的陶瓷基复合材料表面,主要起到隔绝高温水蒸气和空气的作用。为确保足够长的服役寿命,环境障涂层材料需具备高韧性、高硬度和较低杨氏模量等特性。采用放电等离子烧结工艺制备了致密的RETa_(3)O_(9)(RE=La,Nd,Sm,Gd,Ho)钽酸盐陶瓷,并系统研究了其纳米力学性能。利用纳米压痕仪对RETa_(3)O_(9)陶瓷的硬度、杨氏模量、断裂韧性、耐磨性和刚度等关键力学性能进行了系统表征,并分析了影响其力学性能的主要因素。研究结果表明,RETa_(3)O_(9)陶瓷的杨氏模量(166.72~196.70 GPa)和硬度(9.52~11.69 GPa)主要受稀土离子半径和致密度的影响。断裂韧性(1.44~1.82 MPa·m^(1/2))与晶粒尺寸密切相关,采用放电等离子烧结工艺制备的RETa_(3)O_(9)陶瓷具有更细小的晶粒尺寸,从而显著提高了断裂韧性。刚度(186064~285730 N·m^(-1))和耐磨性(0.60~0.65)则主要受到材料本身硬度和杨氏模量影响,该陶瓷刚度与硬度呈正相关,耐磨性较高。通过纳米压痕测试评估了RETa_(3)O_(9)陶瓷的综合力学性能,探究了它作为环境障涂层材料使用的可行性,发现SmTa_(3)O_(9)展现出优异的综合力学性能,是极具前景的环境障涂层候选材料。Environmental barrier coating materials are widely applied on the surface of ceramic matrix composites in aero engines and hypersonic vehicles,primarily serving to isolate high-temperature water vapor and air.To ensure a sufficiently long service life,environmental barrier coating materials must possess characteristics such as high toughness,high hardness,and relatively low Young s modulus.In this study,dense RETa_(3)O_(9)(RE=La,Nd,Sm,Gd,Ho)tantalate ceramics were prepared by spark plasma sintering technology,and their nanomechanical properties were systematically investigated.The nanoindentation technique was employed to comprehensively characterize key mechanical properties of RETa_(3)O_(9)ceramics,including hardness,Young s modulus,fracture toughness,wear resistance and stiffness,while analyzing the main factors influencing these mechanical properties.The research results demonstrate that the Young s modulus(166.72~196.70 GPa)and hardness(9.52~11.69 GPa)of RETa_(3)O_(9)ceramics are mainly influenced by rare earth ion radius and density.The fracture toughness(1.44~1.82 MPa·m^(1/2))shows a strong correlation with grain size,and the RETa_(3)O_(9)ceramics prepared by spark plasma sintering process exhibit finer grain size,which significantly enhances fracture toughness.The stiffness(186064~285730 N·m^(-1))and wear resistance(0.60~0.65)are primarily affected by the material s hardness and Young s modulus,with stiffness showing a positive correlation with hardness,while demonstrating overall excellent wear resistance.This study comprehensively evaluated the integrated mechanical properties of RETa_(3)O_(9)ceramics through nanoindentation testing system,exploring their potential as environmental barrier coating materials.The results indicate that SmTa_(3)O_(9)exhibits outstanding comprehensive mechanical properties,making it a highly promising candidate material for environmental barrier coatings.

关 键 词：稀土钽酸盐 纳米压痕 断裂韧性 力学性能 环境障涂层 

分 类 号：TG174.4[金属学及工艺—金属表面处理]