膨胀石墨/八水氢氧化钡复合定型相变材料的制备与储热性能研究  

Preparation and heat storage performance investigation of expanded graphite/octahydrate composite solidified phase change material

作　　者：冷从斌[1] 季旭[1] 罗熙[1] 李明[1] 余琼粉[1] 李海丽[1] 宋向波 

机构地区：[1]云南师范大学能源与环境科学学院,昆明650500

出　　处：《功能材料》2016年第3期247-252,共6页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51366014);云南省应用基础研究计划资助项目(2012FD018)

摘　　要：通过在八水氢氧化钡中添加成核剂磷酸二氢钾和强化传热材料膨胀石墨,利用真空吸附法制备了膨胀石墨/八水氢氧化钡复合定型相变材料.采用LeicaDM6000M 显微镜,“步冷曲线法”和量热法对其热性能进行了表征和测试,结果发现,添加0.5%-2%的磷酸氢二钾可使八水氢氧化钡的过冷度由11.4℃降低到0.5℃以内,1%-3%的膨胀石墨可使过冷度降低到4 ℃. 复合定型相变材料的较优组成为：93%Ba（OH）2·8H2O＋6%EG＋1%KH2PO4 时,其相变潜热为248.3kJ/kg,与纯物质相比可缩短储热时间45.1%,缩短放热时间54.5%,且相变中无液态产生,是较好的“固G固”定型复合相变材料.The expanded graphite/octahydrate composite solidified phase change material was prepared through adding the nucleating agent of potassium dihydrogen phosphate and the thermal conductivity material of expanded graphite to the octahydrate by utilizing the vacuum adsorption method.The thermal performance of the expanded graphite/octahydrate composite solidified phase change material was tested and investigated with the methods of cooling curve and calorimetry analysis.The results indicated that when the potassium dihydrogen phosphate of 0.5%-2% was added,the supercooling degree of octahydrate decreased from 11.4 ℃ to within0.5 ℃,and the supercooling degree could be reduced to 4℃ by adding 1%-3%expanded graphite.The optimum composition of composite phase change material was 93% Ba(OH)2·8H2O +6% EG +1% KH2PO4,the latent heat of the phase-change material was up to 248.3kJ/kg.When compared with the pure substance,the heat storage time could be shortened by 45.1%,the release heat could be shortened by 54.5%,and there were no liquid phase change produced in the phase change process,which was a novel solid-solid composite phase change material.

关 键 词：八水氢氧化钡 膨胀石墨 复合相变材料 过冷 

分 类 号：TK02[动力工程及工程热物理] TK114