石墨/NR导热复合材料的研究

Study on graphite/NR thermal conductive composite

分别采用可膨胀石墨、粉碎后的可膨胀石墨和膨胀石墨制备石墨/NR导热复合材料,研究石墨品种和用量对复合材料性能的影响。结果表明,随着石墨用量的增大,填充可膨胀石墨、粉碎后的可膨胀石墨和膨胀石墨复合材料的物理性能均有不同程度下降,填充膨胀石墨复合材料的热导率增大,填充可膨胀石墨或粉碎后可膨胀石墨复合材料的热导率先增大后减小。当石墨用量相同时,填充膨胀石墨复合材料的热导率高于填充可膨胀石墨或粉碎后的可膨胀石墨复合材料。石墨/NR复合材料压缩疲劳温升与热导率的正相关性较好。

The graphite/NR thermal conductive composites were prepared by expandable graphite,crushed expandable graphite and expanded graphite.The influence of the type and addition level of graphite on the properties of composites was investigated.The results showed that,as the addition level of graphite increased,the physical properties of composites filled with expandable graphite,crushed expandable graphite or expanded graphite were decreased in different degrees;the thermal conductivity of the composites filled with expanded graphite was increased,and that of the composites filled with expandable graphite or crushed expandable graphite was increased at first and then decreased.The thermal conductivity of the composites filled with expanded graphite was higher than that of the composites filled with expandable graphite or crushed expandable graphite at the same addition level of graphite.The temperature rise of graphite/NR composites in compression fatigue test was positively correlated with thermal conductivity.