Fe 2O 3 on In-situ Synthesized SiC w/SiC Composite Ceramics for Solar Thermal Energy Storage

【Author】

XU Xiao-Hong;TIAN Jiang-Zhou;WU Jian-Feng;ZHANG Qian-Kun;JIN Hao;DU Yi-Xin

【Institution】

School of Materials Science and Engineering, Wuhan University of Technology;School of Materials Science and Engineering, Wuhan University of Technology;School of Materials Science and Engineering, Wuhan University of Technology;School of Materials Science and Engineering, Wuhan University of Technology;School of Materials Science and Engineering, Wuhan University of Technology;School of Materials Science and Engineering, Wuhan University of Technology

【Abstract】

In order to improve the solar thermal storage properties of the SiC w/SiC composite ceramics, in-situ growth and morphology of SiC whiskers (SiC w) were controlled by the addition of catalyst Fe 2O 3 (0.5 wt%–2.0 wt%) on the basis of formula CF0 (SiC 69.31 wt%, AlN 20.30 wt%, Si 10.39 wt%). The effect of Fe 2O 3 on the morphology of SiC w as well as the growth mechanism and properties of SiC composite ceramics were analyzed. The results indicated that the SiC w growth mechanism changed from vapor–solid to vapor–liquid–solid after the addition of Fe 2O 3. The addition of Fe 2O 3 which adjusted the solubility of C element into Fe-Si droplets and firing temperature jointly controlled the morphology of SiC w. The Sample CF4 (Fe 2O 3 2.0 wt%) fired at 1500 °C with whisker diameter of 50–100 nm and whisker length of 1–6 μm possessed optimal performance. The bulk density, bending strength, specific heat capacity and thermal conductivity were 2.19 g/cm 3, 45.08 MPa, 0.95 J/(g·K) (25 °C), 18.15 W/(m·K) (25 °C), respectively. The thermal conductivity increased by 169% compared with that of the sample without Fe 2O 3. Few defects and large diameter of whisker grown by vapor–liquid–solid mechanism could improve the thermal properties by reducing the matrix-whisker thermal barrier.

【Keywords】

Fe 2O 3;SiC whiskers;SiC w/SiC composite ceramics;solar thermal energy storage

References

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Total: 23 articles

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