纳米热障涂层材料Ln_(2)(Zr_(0.7)Ce_(0.3))_(2)O_(7)(Ln=La,Nd,Sm,Gd)的热物性能  

Thermophysical Properties of Ln_(2)(Zr_(0.7)Ce_(0.3))_(2)O_(7)(Ln=La,Nd,Sm,Gd)Nanomaterials for Thermal Barrier Coatings

作　　者：王月[1] 付博研 陈双龙[1] 邹兵林 王春杰[1] WANG Yue;FU Boyan;CHEN Shuanglong;ZOU Binglin;WANG Chunjie(College of Physical Science and Technology,Bohai University,Jinzhou 121013,China;State Key Laboratory of Rare Earth Resources Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China)

机构地区：[1]渤海大学物理科学与技术学院,锦州121013 [2]中国科学院长春应用化学研究所稀土资源利用国家重点实验室,长春130022

出　　处：《材料研究学报》2023年第11期855-861,共7页Chinese Journal of Materials Research

基　　金：国家自然科学基金(12004050);辽宁省教育厅项目(LJKMZ20221493,JYTMS20231624)。

摘　　要：用水热合成法制备纳米热障涂层材料Ln_(2)(Zr_(0.7)Ce_(0.3))_(2)O_(7)(Ln=La,Nd,Sm,Gd),表征其晶体结构、形貌、晶格参数、平均粒径尺寸和比表面积并研究了相关的热物性能及其机理。对XRD谱和Raman谱的分析表明,La_(2)(Zr_(0.7)Ce_(0.3))_(2)O_(7)、Nd_(2)(Zr_(0.7)Ce_(0.3))_(2)O_(7)和Sm_(2)(Zr_(0.7)Ce_(0.3))_(2)O_(7)均为烧绿石结构,而Gd_(2)(Zr_(0.7)Ce_(0.3))_(2)O_(7)为萤石结构。结合SEM观察、体积收缩以及相对密度,分析了块材的抗烧结性能。系统对比研究了晶体生长行为、热膨胀系数和热导率等热物性能。结果表明:随着Ln离子半径的减小(La>Nd>Sm>Gd)Ln_(2)(Zr_(0.7)Ce_(0.3))_(2)O_(7)(Ln=La,Nd,Sm,Gd)纳米材料的晶体生长活化能和热膨胀系数均呈增大的趋势,而热导率则呈降低的趋势。Thermal barrier coatings are widely used in the protection of engine turbine blade,in this paper,Ln_(2)(Zr_(0.7)Ce_(0.3))_(2)O_(7)(Ln=La,Nd,Sm,Gd)nanomaterials for the applications of thermal barrier coatings were synthesized by hydrothermal method,the crystallographic structures,morphologies and related thermophysical properties of powders and their bulk materials were comparatively assessed via various techniques.The analysis results of XRD and Raman spectra indicate that La_(2)(Zr_(0.7)Ce_(0.3))_(2)O_(7),Nd_(2)(Zr_(0.7)Ce_(0.3))_(2)O_(7)and Sm_(2)(Zr_(0.7)Ce_(0.3))_(2)O_(7)are pyrochlore structures,while Gd_(2)(Zr_(0.7)Ce_(0.3))_(2)O_(7)belongs to fluorite type.The lattice parameters,average particle sizes and specific surface areas were also characterized.The volume shrinkage/relative density,the sintering-resistance properties of the four bulk materials were evaluated by SEM observation.Additionally,their thermophysical properties(such as the activation energy of crystal growth,thermal expansion coefficient,and thermal conductivity)were investigated in detail.As the ionic radii of Ln decreasing,the activation energy of crystal growth and thermal expansion coefficient of Ln_(2)(Zr_(0.7)Ce_(0.3))_(2)O_(7)(Ln=La,Nd,Sm,Gd)increased,however the thermal conductivity is just the opposite.

关 键 词：无机非金属材料 热障涂层材料 热物性能 晶体生长活化能 

分 类 号：TG174.45[金属学及工艺—金属表面处理]