氧化锆陶瓷四方相以及晶界热导率的定量计算  

Quantitative Calculation of Thermal Conductivity of Tetragonal Phase and Grain Boundary on Zirconia Ceramics

作　　者：赵韦韦 陈潇忻 林初城[2] 宋雪梅 曾毅[2] 常程康 

机构地区：[1]上海应用技术大学材料科学与工程学院,上海200235 [2]中国科学院上海硅酸盐研究所,上海200050 [3]江苏大学材料科学与工程学院,镇江212013

出　　处：《无机材料学报》2017年第11期1177-1180,共4页Journal of Inorganic Materials

基　　金：国家重点计划研究计划(2016YFA0201103)~~

摘　　要：氧化钇部分稳定的氧化锆(YSZ)涂层是应用广泛的热障涂层材料。为了更好地研究各种因素对热障涂层热导率的影响,使用压制烧结的方法制备基本致密的氧化锆陶瓷,研究相组成和晶粒大小对热导率的定量影响。在不同的烧成制度下制备出不同晶粒大小的氧化锆陶瓷。用电子背散射衍射(EBSD)图像研究氧化锆陶瓷材料的相组成以及晶界的分布情况。综合有限元模拟的方法以及傅立叶传导方程,计算出四方相和晶界的热导率分别为2.65 W/(m·K)和1.54 W/(m·K)。研究表明,四方相的热导率比氧化锆陶瓷的热导率高,而晶界的热导率比氧化锆陶瓷的低。The yttria-stabilized zirconia（YSZ） coatings have been widely used as thermal barrier coatings（TBCs）. In order to investigate the factors that influenced the thermal conductivity of TBCs, bulk YSZ ceramics with different grain sizes were prepared via hot-pressing sintering methods under different annealing conditions. The quantitative effects of the phase and the grain size on the thermal conductivity were analyzed. Based on electron backscatter diffraction images（EBSD） of YSZ ceramics, the distribution of grain boundaries and tetragonal phase were obtained. And thermal conductivities of grain boundaries and tetragonal phase were calculated by finite element models and Fourier＇s equation. The thermal conductivities of grain boundaries and tetragonal phase are 2.65 W/（m·K） and 1.54 W/（m·K）, respectively. The results reveal that the thermal conductivity of tetragonal phase is higher than that of the YSZ ceramic（2.31 W/（m·K））, while grain boundary＇s is lower than that of the YSZ ceramic.

关 键 词：氧化锆陶瓷 四方相 晶界 热导率 

分 类 号：TQ174[化学工程—陶瓷工业]