AlN-CNTs/聚酰亚胺复合材料的制备与性能

Preparation and property of CNTs-AlN/PI composite material

为了研究氮化铝(AlN)和碳纳米管(CNTs)对聚酰亚胺(PI)的导热、热学、力学性能的协同效应,采用湿法球磨和热压成型法制备了AlN/PI和CNTs-AlN/PI复合材料。利用X射线衍射仪、扫描电子显微镜对复合材料进行了物相分析和断面形貌表征,分别考察了AlN及其与CNTs协同对PI复合材料的导热、热学、力学性能的影响。结果表明,AlN和CNTs在PI基体中分散均匀且接触界面良好,AlN的加入可以显著地提高复合材料的导热性能,且对复合材料的热稳定性和力学性能有一定的提高;固定AlN的含量为10%,加入少量的CNTs可以提高复合材料的导热性能,但对复合材料的力学性能有一定的负面影响。

In order to study the synergistic effect of aluminum nitride(AlN)and carbon nanotubes(CNTs)on thermal conduction,thermal and mechanical properties of polyimide(PI),AlN/PI and CNTs-AlN/PI composite materials were prepared by wet milling and hot pressing.The composites were characterized by X-ray diffractometer(XRD)and their microstructures were characterized by field emission scanning electron microscope.The effects of AlN and AlN/CNTs on the thermal conductivity,thermal and mechanical properties of PI composites were investigated,respectively.The results shown that AlN and CNTs were dispersed uniformly in PI matrix with good contact interface,the addition of AlN can significantly improve the thermal conductivity of the composites.The thermal stability and mechanical properties of the composites had a certain improvement.The thermal conductivity of the composites can be improved by fixing 10% AlN and adding a small amount of CNTs,while the mechanical properties of the composites were negatively affected.