热适应复合相变材料的制备与热性能

PREPARATION AND THERMAL PROPERTIES OF THERMAL ADAPTATION COMPOSITE MATERIALS

根据电子器件散热技术领域对热适应复合材料的性能要求,选取导热系数高且密度低的膨胀石墨作为无机支撑材料,石蜡作为有机相变材料,制备出高导热系数和储热密度的热适应复合相变材料。采用扫描电镜(SEM)、差示扫描量热仪(DSC)、偏光显微镜(POM)和Hot Disk热常数分析仪等多种测试技术,对复合相变材料进行分析研究;通过储/放热实验和1000次热循环实验研究了复合相变材料的传热性能和热稳定性。实验结果说明该复合相变材料具有形状稳定、导热率高、储热密度大等特点,并具有良好的热稳定性和使用寿命。

According to the performance demand of thermal adaptation composite materials in electronic cooling, a kind of thermal adaptation composite materials was prepared by using paraffin as the phase change material and por- ous expanded graphite with high thermal conductivity as the supporting material. The thermal adaptation composite materials were characterized by scanning electronic microscope （SEM）, differential scanning calorimeter （DSC）, polarization optical microscope （POM） and Hot Disk thermal analysis. The heat transfer performance and thermal stability of the composite materials were then investigated by the heat storage/release experiment and the thermal cycle experiments of 1000 times, respectively. The experimental results showed that the composite materials have many characteristics, such as form-stable, high thermal conductivity and heat storage capacity, excellent thermal stability and service life.