Preparation of expanded graphite-carbon fiber/nylon ternary thermally conductive composites
-
摘要: 以尼龙6(PA6)为基体,膨胀石墨(EG)和碳纤维(CF)作为导热填料,采用熔融共混法制备了EG/PA6、CF/PA6和CF-EG/PA6导热复合材料。重点研究当固定导热填料(CF和EG)填充量为40wt%时,CF与EG不同的填充比例对CF与EG的接触方式及CF-EG/PA6复合材料的导热性和力学性能的影响。结果表明,相比单一CF填充,EG的加入有利于CF-EG/PA6复合材料热导率的增加;CF:EG质量比是25:15时的EG-CF/PA6三元复合材料,热导率可以达到2.554 W/(m·K),是PA6的8倍,拉伸强度提高了125.34%,弯曲强度提高了119.8%,同时具有优异的耐热性。SEM结果表明,纤维状CF与蠕虫状EG片层在适当的填充比例下可以形成"面接触"的三维网络结构,这种三维网络结构不仅显著增大EG-CF/PA6复合材料的热导率,而且明显提高了其力学性能和耐热性能。为研制填充型导热高分子材料提供了一条新思路。Abstract: With nylon 6 (PA6) as the matrix and carbon fiber (CF), expanded graphite (EG) as the thermal conductive filler, EG/PA6, CF/PA6 and CF-EG/PA6 thermal conductive composites were prepared by melt-mixing. Fixed the filling content of 40wt%, the effects of different ratios of CF to EG on the contact mode between CF and EG, and the thermal conductivity and mechanical properties of CF-EG/PA6 composites were studied. The results indicate that the addition of EG is beneficial to increase of the thermal conductivity of CF-EG/PA6 composites compared to single CF filling; When CF:EG mass ratio is 25:15, the thermal conductivity of CF-EG/PA6 composite reaches 2.554 W/(m·K), which is 7 times higher than that of PA6, the tensile strength is increased by 125.34%, the flexual strength is increased by 119.8%, and the heat resistance demonstrates excellent. The SEM results show that fibrous CF and worm-like EG can form a 3D network structure with "Terms contact" under the appropriate filling ratio. The 3D network structure not only significantly increases the thermal conductivity of CF-EG/PA6 composite, but also significantly improves the mechanical and thermal properties of the composite. It provides a new idea for the development of filled thermally conductive polymer materials.
-
Keywords:
- nylon 6 /
- expanded graphite /
- carbon fiber /
- thermal conductivity /
- mechanical properties
-
-
期刊类型引用(2)
1. 李滋阳,王思佳,邓文举. 陶瓷颗粒增强金属基复合材料研究进展. 轻工科技. 2021(04): 41-44 . 百度学术
2. 陈亚楠,金云学,牛牧野,陈洪美,杜文栋. Ni_3Al(Cr)合金室温干滑动摩擦磨损性能研究. 江苏科技大学学报(自然科学版). 2019(05): 18-26 . 百度学术
其他类型引用(4)
-
计量
- 文章访问数: 1041
- HTML全文浏览量: 91
- PDF下载量: 349
- 被引次数: 6