热循环处理对(Gd_(0.9)Yb_(0.1))_(2)Zr_(2)O_(7)/Yb_(2)O_(3)稳定ZrO_(2)热障涂层力学性能的影响  

Effect of Heat-Treatment on Mechanical Properties of (Gd_(0.9)Yb_(0.1))_(2)Zr_(2)O_(7)/Yb_(2)O_(3) Stabilized ZrO_(2)Coatings During Thermal Cycling

作　　者：何永香 范习之 迟光芳 张伟 左劲旅 李沙 杨波 毛卫国 HE Yongxiang;FAN Xizhi;CHI Guangfang;ZHANG Wei;UO Jinlv;LI Sha;YANG Bo;MAO Weiguo(College of Materials Science and Engineering,Changsha University of Science and Technology,Changsha 410114,China;Hunan Provincial Key Laboratory of Advanced Coating Technology for High-End Equipment,Changsha 410114,China;Hunan Boyun New Materials Corporation Limited,Changsha 410205,China)

机构地区：[1]长沙理工大学材料科学与工程学院,长沙410114 [2]高端装备先进涂层技术湖南省重点实验室,长沙410114 [3]湖南博云新材料股份有限公司,长沙410205

出　　处：《硅酸盐学报》2024年第7期2329-2340,共12页Journal of The Chinese Ceramic Society

基　　金：国家重点研发计划(2021YFB3702304-4);国家科技重大专项(J2019-VI-0017-0132,J2022-VI-0008-0039);博云新材航天用先进碳基耐烧蚀材料领域创新团队。

摘　　要：新型掺杂改性的锆酸钆涂层材料有望成为下一代航空发动机热端部件的关键防热材料。采用大气等离子喷涂工艺,在Inconel 600基底上制备了(Gd_(0.9)Yb_(0.1))_(2)Zr_(2)O_(7)/Y_(2)O_(3)稳定ZrO_(2)(GYbZ/8YSZ)热障涂层,在1100℃完成了100次热循环处理,系统分析了涂层成分、微观结构和力学性能的演变。结果表明,在喷涂前后和后期的热循环处理过程中,GYbZ材料结构稳定;在涂层界面产生了热生长氧化层,其逐渐增厚至20μm;在50次热循环后,涂层弹性模量与硬度分别达到最大值182.01 GPa和9.13 GPa;高温原位压痕测试表明,在700℃后,GYbZ涂层表面高温硬度基本趋于稳定。经过不同次数热循环处理后,涂层残余应力变化范围为–41.02~–123.67 MPa,断裂韧性范围为0.93~2.02 MPa·m^(1/2)。系统地讨论了高温长时间热处理过程中GYbZ/8YSZ体系微观结构演变与力学性能的关联,为后续可靠性预测提供了重要的实验依据。Introduction Thermal barrier coatings can be used for the stable operation of aircraft engines under high-temperature environments due to their excellent oxidation resistance,corrosion resistance and heat insulation properties.However,the high-temperature phase transition of conventional 8.0%(in mass fraction) Y_(2)O_(3) stabilized ZrO_(2) ceramic (8YSZ) materials exists when the service temperature exceeds 1200℃.Developing thermal barrier coatings,such as rare-earth zirconates and rare-earth silicate,becomes popular.(Gd_(0.9)Yb_(0.1))_(2)Zr_(2)O_(7)(GYbZ)/8YSZ coatings with a low thermal conductivity and a high temperature phase stabilization are regarded as potential thermal protective materials.At present,some work focus on the preparation properties optimization of air plasma spraying,electron beam physical vapor deposition and plasma spray physical vapor deposition techniques,respectively.It is important to in-situ investigate the mechanical properties and failure mechanisms of GYbZ/8YSZ coatings at>1200℃.Methods GYbZ/8YSZ thermal barrier coatings were prepared with NiCrAlY,8YSZ and GYbZ powders on an Inconel 600 nickel-based superalloy with the thickness of 2 mm via air plasma spraying.GYbZ/8YSZ thermal barrier coatings were subjected to thermal cycle treatments in a Muffle furnace at 1100℃ for 1 h,and then cooled to room temperature for 1 thermal cycle.The times of thermal cycles were 10,50 and 100,respectively.The phase and microstructure of the coatings were analyzed by X-ray diffraction(XRD) and scanning electron microscopy (SEM) before and after heat-treatments.The elastic modulus,hardness,fracture toughness and residual stress were measured by an indentation method at different temperatures.Results and discussion The XRD patterns show that GYb Z powder and the as-sprayed coating are a defective fluorite structure,and the doping of Yb^(3+)with small ionic radius makes the material change from a pyrochrite structure to a defective fluorite structure.In addition,the samples treated for different th

关 键 词：热障涂层 氧化镱掺杂锆酸钆 高温硬度 断裂韧性 残余应力 

分 类 号：V254.2[一般工业技术—材料科学与工程]