【摘要】 以SiC纳米纤维为传热介质,在其表面采用原位生长的方法,均匀负载了多孔碳材料,从而制备了多孔碳球/SiC纳米纤维载体材料。然后以十八醇为相变芯材,通过物理吸附法制备了多孔碳球/SiC纳米纤维/十八醇复合相变材料,研究了不同相变芯材负载量的复合相变材料的储热性能与稳定性能。DSC检测表明,负载40wt%十八醇的复合相变材料的熔点和凝固点分别为58.16℃和52.25℃,熔化潜热为101.42J/g;负载50wt%十八醇的复合相变材料的熔点和凝固点分别为58.01℃和51.93℃,熔化潜热为115.47J/g。与十八醇相比,负载40wt%十八醇的复合相变材料的导热率提高了71%;负载50wt%十八醇的复合相变材料的导热率提高了62%。该复合相变材料在循环使用300次后,其导热率基本保持相同,具有稳定性高;相变芯材封装安全性好,相变潜热大,具有非常优异的应用性能。更多还原

【Abstract】 With SiC nanofibers as heat-transfer medium,the porous carbon spheres/SiC nanofibers materials were prepared by loading porous carbon materials uniformly on the surface of the SiC nanofibers via in-situ growth method. Using 1-Octadecanol as phase change materials,the porous carbon spheres/SiC nanofibers/1-octadecanol composite phase change materials were synthesized via physical absorption method. The heat storage performance and stability of the composite phase change materials with different mass ratio were investigated. The DSC measurements reveal that the melting point and freezing point of the composite phase change materials with 40 wt% 1-Octadecanol are 58. 16 ℃ and 52. 25 ℃,respectively,and their latent heat of fusion are 101. 42 J/g. The melting point and freezing point of the composite phase change materials with 50 wt% 1-Octadecanol are 58. 01 ℃ and 51. 93 ℃,respectively,and their latent heat of melting are 115. 47 J/g. Compared with 1-Octadecanol,the thermal conductivity of the composite phase change materia with 40 wt% 1-Octadecanol was increased by 71%; the thermal conductivity of the composite phase change material with 50 wt% 1-Octadecanol was increased by 62%.After 300 cycles,the composite phase change materials aslo have the good thermal conductivity andthermal stability. Thus,the composite phase change materials have good safety,high latent heat,and excellent application performance.更多还原