无机盐复合相变储热材料的微结构演化及性能表征

摘要本课题主要研究了以共晶碳酸盐为相变材料，以轻质氧化镁、硅藻土、蛭石为支撑材料进行复合相变储热材料的制备及性能的检测和微结构的表征。采用混合烧结法制备样品，并对样品进行了 XRD、FTIR、SEM、DSC 表征以及导热性能的测定。制备过程中发现以轻质氧化镁为支撑材料的制样效果最好，而蛭石的效果最差；XRD 及 FT－IR 结果表明：烧结前后材料内没有发生化学变化；稳态导热系数法测定了材料的导热系数发现：以轻质氧化镁为支撑材料的复合材料导热性能最好，加入 10%石墨后，材料导热系数有很大提升；DSC 结果发现：由于支撑材料及复合材料自身结构的缘故，测试显示的相变温度出现滞后现象；SEM 结果发现：烧结次数对复合材料的微结构有很大影响。随着烧结次数的增加，复合材料内的孔隙会越变越大，且其孔也由不规则成圆孔状，当达一定次数后，孔径不再变化。77977

毕业论文关键词复合相变储热材料碳酸盐微结构

毕业设计说明书英文摘要

Title Microstructure evolution of inorganic salt composite phase change thermal energy storage materials and Performance characterization。

Abstract This paper studies the eutectic carbonate as phase change materials, light Magnesia, diatomite, vermiculite as support materials to Prepare the composite phase change thermal storage materials and make Performance measurement and characterization of microstructure; The samples

prepared by mixing and sintering method, and characterized by XRD、FT－IR、SEM、DSC

characterization and determination of thermal conductivity the performance。 It is found that in the process of preparing for the light of Magnesium Oxide as sample preparation materials and good supporting effect, vermiculite effect is the worst; XRD and FT－IR results showed that before and

after sintering material no chemical change; found that the thermal conductivity of the material was measured in steady heat conduction coefficient method: Light magnesium oxide material support of the thermal conductivity of the composites was best。 adding 10% graphite, thermal conductivity of materials has greatly improved; DSC results showed that the appearance of water peak will affect the size of the phase transition temperature; the results of SEM Found: sintered at different times, the composite micro structure has a great influence on。 With the increase of the number of sintering, the composite pore will become bigger and bigger and the hole also from irregular into shaped circular hole, when reached a certain number of times, pore size does not change。

Keywords Composite phase change heat storage material carbonate Micro structure

本科毕业设计说明书第 I 页

1 引言 1

1。1 蓄热材料的分类 1

1。1。1 显热蓄热材料 1

1。1。2 相变蓄热材料 2

1。1。3 化学反应蓄热材料 2

1。1。4 复合蓄热材料 2

1。2 相变材料的分类 2

1。3 无机盐复合相变蓄热材料 2

1。3。1 无机盐复合相变蓄热材料的特点 3 无机盐复合相变储热材料的微结构演化及性能表征:http://www.youerw.com/huaxue/lunwen_89734.html