Stereotypes Package and Thermal Properties of Porous SiC Ceramics/Paraffin Composite Phase Change Materials

Abstract

Abstract: Porous silicon carbon (SiC) ceramics with coherent laminated structure were prepared by freeze-drying process with micron SiC powder as raw material. With porous SiC ceramics as matrix and paraffin as phase change material, the porous SiC ceramics/paraffin composite phase change materials were synthesized via vacuum impregnation method. Infiltration behavior of paraffin in laminated porous SiC ceramics and the heat storage performance and stability of composite phase change materials were investigated. The results show that the microstructure of laminated porous SiC ceramics has a significant effect on the infiltration process and heat storage properties of paraffin. When the paraffin load is 21.7% (mass fraction), the melting point and freezing point of composite phase change materials are 59.6 ℃ and 53.9 ℃, respectively, the latent heat of melting is 28.4 J/g, and the thermal conductivity at room temperature reaches 2.4 W·(m·K)^-1. The intensity of endothermic and exothermic peaks of phase change materials decreases with decrease of paraffin load. When the temperature is 200 ℃, the weight loss of porous SiC ceramics/paraffin composite phase change materials is 5% (mass fraction), indicating that the material has good thermal stability. The composite phase change materials maintain its shape without any leakage after being treated in 100 ℃ for 30 min. The composite phase change materials aslo have stable latent heat and good shape stability after 100 thermal cycles.

Key words: SiC ceramics, composite phase change material, laminated porous structure, paraffin, vacuum impregnation method, heat storage performance

CLC Number:

TB34

XU Zhaoyun, LUO Tuansheng, MA Dengjie, HAI Wanxiu, HE Silin. Stereotypes Package and Thermal Properties of Porous SiC Ceramics/Paraffin Composite Phase Change Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(10): 3658-3666.

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