石墨/Ba(OH)_2·8H_2O复合相变材料的制备及热性能  

PREPARATION AND THERMAL PROPERTIES OF GRAPHITE/BA(OH)_2 COMPOSITES AS PHASE CHANGE MATERIALS

作　　者：华维三 章学来[1] 丁锦宏[1] 刘宇飞[1] 罗孝学 

机构地区：[1]上海海事大学蓄冷技术研究所,上海201306

出　　处：《太阳能学报》2017年第7期1755-1760,共6页Acta Energiae Solaris Sinica

基　　金：上海市教委重点项目(12ZZ154);上海海事大学研究生创新基金(SMU201405)

摘　　要：以BaCO_3、CaCl_2、NaCl为成核剂,进行Ba(OH)_2·8H_2O的成核剂筛选实验。采用超声波震荡法,制备不同质量分数的石墨/Ba(OH)_2·8H_2O复合相变蓄热材料体系。对该复合相变蓄热材料体系进行步冷曲线、DSC、导热系数测试和红外成像表征,结果表明:添加1%~2%的BaCO_3不仅可使Ba(OH)_2·8H_2O的过冷度小于1℃,并可延长相变潜热放热时间;石墨粉可有效提高Ba(OH)_2·8H_2O的导热系数和相变稳定性,但添加量应小于0.3%,过量会导致相变潜热值下降和石墨粉在基体材料中的团聚。The selection among BaCO3, CaCl2, NaCl as nucleating agent for Ba （OH）2· 8H2O was made. By using the method of ultrasonic oscillations, different mass fraction of graphite/Ba （OH） 2 in phase change heat storage materials were obtained. According to cooling curves, coefficient of thermal conductivity, DSC and infrared imaging characterization for composites phase change heat storage materials, the results shows that addition about 1% to 2% of BaCO3 not only makes the super-cooling degree of Ba（OH）2· 8H2O reduce to less than 1 ℃, but also extends the latent heat discharging time during phase change. Graphite powder can effectively improve the thermal conductivity of Ba （OH）2 and enhance phase change stability, but over dosage will weaken the value of latent heat of phase change and result in accumulation of graphite powder, which can be avoided, according to the experimental result, if the mass fraction of graphite powder is below 0.3%.

关 键 词：相变材料 复合材料 混合物 石墨 Ba(OH)2·8H2O 

分 类 号：TK02[动力工程及工程热物理]