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

doi:10.15541/jim20170046

Abstract

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

CLC Number:

TQ174

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.

Figures/Tables 9

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

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

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

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

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

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

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

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

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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