氧化锆陶瓷四方相以及晶界热导率的定量计算

doi:10.15541/jim20170046

无机材料学报 ›› 2017, Vol. 32 ›› Issue (11): 1177-1180.DOI: 10.15541/jim20170046

氧化锆陶瓷四方相以及晶界热导率的定量计算

赵韦韦^1,2, 陈潇忻³, 林初城², 宋雪梅², 曾毅², 常程康¹

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

收稿日期:2017-01-19 修回日期:2017-03-08 出版日期:2017-11-20 网络出版日期:2017-10-20
作者简介:赵韦韦(1989-), 女, 硕士研究生. E-mail: wwzhao1218@163.com
基金资助:
国家重点计划研究计划(2016YFA0201103)

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

ZHAO Wei-Wei^1,2, CHEN Xiao-Xin³, LIN Chu-Cheng², SONG Xue-Mei², ZENG Yi², CHANG Cheng-Kang¹

1. School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 200235,China;
2. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;
3. School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, China

Received:2017-01-19 Revised:2017-03-08 Published:2017-11-20 Online:2017-10-20
Supported by:
National Key Technologies R&D Program of China (2016YFA0201103)

摘要/Abstract

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。

关键词: 氧化锆陶瓷, 四方相, 晶界, 热导率

Abstract:

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.

Key words: zirconia ceramics, tetragonal phase, grain boundary, finite element method

中图分类号:

TQ174

赵韦韦, 陈潇忻, 林初城, 宋雪梅, 曾毅, 常程康. 氧化锆陶瓷四方相以及晶界热导率的定量计算[J]. 无机材料学报, 2017, 32(11): 1177-1180.

ZHAO Wei-Wei, CHEN Xiao-Xin, LIN Chu-Cheng, SONG Xue-Mei, ZENG Yi, CHANG Cheng-Kang. Quantitative Calculation of Thermal Conductivity of Tetragonal Phase and Grain Boundary on Zirconia Ceramics[J]. Journal of Inorganic Materials, 2017, 32(11): 1177-1180.

图/表 9

图1 氧化锆陶瓷(a) C1样品和(b) C2样品的XRD图谱

Fig. 1 XRD patterns of ceramics (a) Specimen C1; (b) Specimen C2

图2 氧化锆陶瓷(a) C1样品和(b) C2样品的自然断面的SEM照片

Fig. 2 SEM images of natural cross-section of ceramics (a) C1; (b) C2

图3 氧化锆陶瓷(a) C1和(b) C2的EBSD图像

Fig. 3 EBSD images of YSZ ceramics (a) C1; (b) C2

表1 氧化锆陶瓷的四方相, 裂纹气孔含量, 以及晶粒的平均尺寸

Table 1 Amount of pores and cracks, tetragonal phase and average grain size of YSZ ceramics

	Pores and cracks	Tetragonal phase	Average grain size
C1	1.5%	98.5%	632 nm
C2	0.7%	99.3%	1820 nm

表2 氧化锆(YSZ)陶瓷的密度ρ、热扩散系数α、比热容Cp和热导率λ

Table 2 Density, thermal diffusivity, specific heat capacity, and thermal conductivity of YSZ ceramics

	ρ/(g•cm^-3)	α/(cm³•s^-1)	C_p/(J•g^-1•K^-1)	λ/(W•m^-1·K^-1)
C1	5.943	0.00627	0.619	2.31
C2	5.944	0.00692	0.618	2.54

图4 氧化锆陶瓷(a) C1和(b) C2的有限元网络模型

Fig. 4 Finite element mesh of YSZ ceramics (a) C1; (b) C2

图5 氧化锆陶瓷(a) C1样品和(b) C2样品的热流密度图谱

Fig. 5 Thermal flux spectra of YSZ ceramics (a) C1; (b) C2

图6 氧化锆陶瓷(a) C1样品和(b) C2样品的温度梯度图

Fig. 6 Thermal gradient of YSZ ceramics (a) C1; (b) C2

表3 四方相以及晶界的热导率大小以及氧化锆陶瓷热导率的模拟数值与测量值

Table 3 Thermal conductivities of the tetragonal phase (λT) and grain boundaries (λGB), estimated (λ0) and experimental (λ) thermal conductivites of YSZ ceramics

	λ_T/ (W•m^-1·K^-1)	λ_GB/ (W•m^-1·K^-1)	λ₀/ (W•m^-1·K^-1)	λ/ (W•m^-1·K^-1)
C1	2.65 ± 0.01	1.54 ± 0.02	2.33 ± 0.02	2.31
C2	2.65 ± 0.01	1.54 ± 0.02	2.53 ± 0.02	2.54

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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

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