Fused filament fabrication (FFF) technology is one of the most widely used 3D printing methods. Due to the high orientation of the fillers caused by printing, the development of thermally conductive composites suitable for FFF has broad prospects. Although there have been some studies on the effect of h-BN content on the thermal conductivity of composites, there are very few studies on the effect of particle size on composites, which is also very worth deeply researching. In this work, iPP/h-BN thermally conductive composites were prepared by FFF method. The effects of h-BN fillers with different particle sizes on its properties, especially the thermal conductivity, were deeply studied. SEM and XRD results show the medium and large h-BN have a much higher orientation degree than small one. The thermal conductivity results show that h-BN with large particle size has the highest thermal conductivity along the printing direction.

熔融长丝制造 (FFF) 技术是应用最广泛的 3D 打印方法之一。由于印刷引起填料的高取向性，开发适用于FFF的导热复合材料具有广阔的前景。虽然已经有一些关于h-BN含量对复合材料热导率影响的研究，但关于粒径对复合材料的影响的研究却很少，这也是非常值得深入研究的。本文采用FFF法制备了iPP/h-BN导热复合材料。深入研究了不同粒径的 h-BN 填料对其性能的影响，特别是热导率。SEM 和 XRD 结果表明中和大 h-BN 的取向度比小 h-BN 高得多。