高导热聚甲醛复合材料性能研究及热传导模拟

Study on performance and thermal conduction simulation of highly thermally conductive polyoxymethylene composite materials

为了解决聚甲醛(POM)导热性差的问题,在POM中加入了铜纤维(COF)和玄武岩纤维(BF),通过挤出⁃注塑工艺分别制备了POM/COF、POM/COF/BF复合材料;并利用ABAQUS软件验证了COF对POM导热性能的影响。结果表明,铜纤维使POM的热导率达到0.39 W/mK;在力学测试中,COF略微增加了POM的刚度,但却降低了POM的拉伸强度;随着BF含量的增加,POM/COF复合材料的热导率随之增加,在15%含量时达到最大,约为0.5 W/mK,比纯POM的热导率提高了约50%;同时BF的加入使POM的刚度大幅度增加,最大提高了约200%。通过ABAQUS稳态热传导仿真,发现含铜纤维的复合材料表面温度更低,热流更易通过纤维传递至低温区域。

To address the poor thermal conduction issue of polyoxymethylene(POM),copper fiber(COF)and basalt fi⁃ber(BF)were added to POM to prepare POM/COF and POM/COF/BF composites through an extrusion⁃injection molding process.The influence of COF on the thermal conductivity of POM was verified using the ABAQUS software.The results indicated that the addition of copper fiber increased the thermal conductivity of POM up to 0.39 W/mK.The mechanical test results indicated that the incorporation of COF increased the stiffness of POM slightly but reduced its ten⁃sile strength.The thermal conductivity of POM/COF composite increased with an increase in the BF content and reached a maximum of around 0.5 W/mK at a BF content of 15 wt%,which was approximately 50%higher than that of pure POM.Meanwhile,the addition of BF increased the stiffness of POM significantly,resulting in a maximum in⁃crease by about 200%.Through steady⁃state thermal conduction simulation using the ABAQUS software,the compos⁃ite containing copper fiber was found to obtain a lower surface temperature.This may be because the heat flow was more easily transferred to the low⁃temperature area through the fibers.