Fe2O3 on In-situ Synthesized SiCw/SiC Composite Ceramics for Solar Thermal Energy Storage

doi:10.15541/jim20180580

Abstract

Abstract:

In order to improve solar thermal storage properties of the SiC_w/SiC composite ceramics, in-situ growth and morphology of SiC whiskers (SiC_w) were controlled by adding catalyst Fe₂O₃(0.5wt%-2.0wt%) on the basis of formula CF0 (SiC 69.21wt%, AlN 20.30wt%, Si 10.39wt%). Effect of Fe₂O₃ on morphology of SiC_w as well as growth mechanism and properties of SiC composite ceramics were analyzed. Results indicated that SiC_w growth mechanism changed from vapor-solid to vapor-liquid-solid after adding Fe₂O_3. The addition of Fe₂O₃via adjusting solubility of C element into Fe-Si droplets, as well as firing temperature jointly controlled morphology of SiC_w. The sample CF4 (Fe₂O₃ 2.0wt%) fired at 1500 ℃ with whiskers diameter of 50-100 nm and 1-6 μm in length obtained optimal performance, the bulk density, bending strength, heat capacity and thermal conductivity were 2.19 g/cm ³, 45.08 MPa, 0.95 J/(g·K) (25 ℃), 18.15 W/(m·K) (25 ℃), respectively. The value of thermal conductivity increased by 169% compared to the sample without Fe₂O₃. The few defects and large-diameter of whisker grown by vapor-liquid-solid mechanism could improve thermal properties by reducing the matrix-whisker thermal barrier.

Key words: Fe₂O₃, SiC whiskers, SiC_w/SiC composite ceramics, solar thermal energy storage

CLC Number:

TQ174

XU Xiao-Hong, TIAN Jiang-Zhou, WU Jian-Feng, ZHANG Qian-Kun, JIN Hao, DU Yi-Xin. Fe₂O₃ on In-situ Synthesized SiC_w/SiC Composite Ceramics for Solar Thermal Energy Storage[J]. Journal of Inorganic Materials, 2019, 34(10): 1103-1108.

Figures/Tables 9

Fig. 1 Relationships between physical properties and firing temperatures of the samples CF

Fig. 2 XRD patterns of the samples CF fired at 1500 ℃

Fig. 3 XRD patterns of the sample CF4 fired at different temperatures

Fig. 4 SEM morphologies of fractured surface of the sample CF0 fired at 1550 ℃

Fig. 5 SEM morphologies of fractured surface of the samples CF fired at 1550 ℃ (a) CF1; (b) CF2; (c) CF3; (d) CF4

Fig. 6 SEM morphologies of fractured surface of the sample CF4 fired at different temperatures (a) 1475 ℃; (b) 1525 ℃; (c) 1550 ℃; (d) 1575 ℃

Fig. 7 Secondary electron image and EDS patterns of the sample CF4 fired at 1500 ℃

Table 1 EDS analysis results of selected spots

Spot	C/at%	O/at%	Al/at%	Si/at%	Fe/at%
1	44.54	7.12	2.54	44.74	1.06
2	50.40	9.29	1.51	38.43	0.37

Table 2 Experimental results of thermal physical properties of the samples

Sample No.	Testing temperature/℃	Thermal diffusivity/ (mm²·s^-1)	Heat capacity/ (J·g^-1·K^-1)	Thermal conductivity/ (W·m^-1·K^-1)
CF0	25	3.87	0.81	6.74
CF0	300	2.25	1.10	5.62
CF4	25	8.812	0.95	18.15
CF4	300	5.513	1.23	14.69

References 27

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Fe₂O₃ on In-situ Synthesized SiC_w/SiC Composite Ceramics for Solar Thermal Energy Storage

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