钾明矾基低共熔相变储热材料的制备与研究  

Preparation and Study on the Matrix of Aluminum Potassium Sulfate Eutectic Phase Change Heat Storage Materials

作　　者：王智平[1] 田禾青[1] 王克振[1] 赵静[1] 熊文嘉[1] 

机构地区：[1]兰州理工大学材料科学与工程学院,兰州730050

出　　处：《人工晶体学报》2013年第3期491-496,共6页Journal of Synthetic Crystals

基　　金：国家"十二五"科技支撑计划项目(2011BAJ03B08)

摘　　要：以钾明矾(KAl(SO4)2·12H2O)为基元,分别加入不同质量比例的七水硫酸镁(MgSO4·7H2O)和芒硝(Na2SO4·10H2O)混合均匀后加热融化,研究制备出的低共熔材料的相变温度、潜热释放平台及过冷和相分离变化情况。结果表明,七水硫酸镁和钾明矾在任意比例下的混合都能制得低共熔相变储热材料,共晶点在质量比5∶5附近,相变温度41.19℃,持续放热时间长,过冷度1.15℃,无相分离现象出现;而以芒硝与钾明矾混合制备低共熔相变储热材料,共晶点在质量比2∶8附近,相变温度50.10℃,过冷度1.2℃且无相分离现象出现。这两种处于共晶点成分(附近)的低共熔相变储热材料都是很有潜力的低温相变储热材料。Using aluminum potassium sulfate as the matrix, different mass ratio of magnesium sulfate heptahydrate and mirabilite was mixed uniformly in KAI（ SO4 ）·12H2O and then melted, respectively. The feasibility of they form the eutectic phase change heat storage materials and phase change temperature, latent heat of phase change, supercooling and phase separation of eutectic mixture was studied. The results show that the mixture of KAI（SO4） 2·12H2O and MgSO4 · 7H2O can form eutectic mixture at any mass ratio, eutectic composition is located on nearby mass ratio 5 to 5, the eutectic temperature is 41.19℃, the supercooling is about 1.15 ℃, the time of release heat is long and there is no phase separation. When we mix the KAI（SO4）2 · 12H2O and Na2SO4 · 10H2O, eutectic composition is located on nearby mass ratio 2 to 8, the eutectic temperature is 50.10 ℃, the supercooling is about 1. 2 ℃, the time of release heat is about 20 min and there is no phase separation either. They also will be potential phase change materials applied in low temperature.

关 键 词：低共熔相变储热材料 钾明矾 相变温度 放热时间 相分离 

分 类 号：O78[理学—晶体学]