石墨烯对聚四氟乙烯导热和摩擦磨损性能的影响

发布时间：2018-01-23 22:08

本文关键词： 聚四氟乙烯石墨烯体积电阻率导热系数摩擦磨损性能　出处：《工程塑料应用》2017年11期 　论文类型：期刊论文

【摘要】：针对聚四氟乙烯(PTFE)导热性能和耐磨损性能较差的问题,将石墨烯经过氧化氢预处理后,再用硅烷偶联剂KH550对其进行表面改性,然后采用冷压烧结法制备了PTFE/石墨烯复合材料,研究了不同用量下改性和未改性石墨烯对复合材料电性能、导热性能和摩擦磨损性能的影响。结果表明,随着石墨烯用量增加,复合材料的体积电阻率逐渐下降,但在石墨烯质量分数为0%~2%时,复合材料体积电阻率基本处于同一数量级,仍为绝缘材料;当石墨烯质量分数由0%增加至2%时,复合材料的导热系数明显提高,磨损量明显降低,而摩擦系数先升高后降低,但变化幅度较小。与未改性石墨烯相比,KH550改性石墨烯填充的复合材料具有更高的导热性能和摩擦磨损性能。
[Abstract]:In order to solve the problem of poor thermal conductivity and wear resistance of PTFE, graphene was pretreated with hydrogen peroxide and then modified by silane coupling agent KH550. Then PTFE / graphene composites were prepared by cold pressing sintering method. The electrical properties of the composites were studied under different dosage of modified and unmodified graphene. The results show that the volume resistivity of the composites decreases with the increase of graphene content, but when the graphene mass fraction is 0 ~ 2, the volume resistivity of the composites decreases gradually. The volume resistivity of composite is in the same order of magnitude, and it is still insulating material. When the mass fraction of graphene is increased from 0% to 2, the thermal conductivity of the composites is obviously increased and the wear amount is obviously decreased, while the friction coefficient increases first and then decreases, but the variation is small. Compared with the unmodified graphene, the thermal conductivity of the composites is higher than that of the unmodified graphene. The composites filled with KH550 modified graphene have higher thermal conductivity and friction and wear properties.
【作者单位】：国网河南省电力公司濮阳供电公司;
【分类号】：TQ127.11;TQ325.4
【正文快照】： 聚四氟乙烯(PTFE)由四氟乙烯聚合而制得,其具有优异的自润滑性、电绝缘性和耐化学药品性等特点,广泛应用于化工、防腐、食品、机械、摩擦、密封等领域[1 2]。但是其也有传热性能低、耐磨损性能差等缺点,为此,需要通过各种改性技术来改善PTFE的性能,以进一步扩大其应用范围。

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