胡济珠,董 岚,卢婷玉,徐象繁,周 俊.高热导率的聚偏氟乙烯/ 石墨烯复合材料[J].集成技术,2019,8(1):15-23
高热导率的聚偏氟乙烯/ 石墨烯复合材料
High Thermal Conductivity of Polyvinylidene Fluoride/Graphene Composites
  
DOI:10.12146/j.issn.2095-3135.20180909001
中文关键词:  聚偏氟乙烯/石墨烯复合材料;有效介质理论;热导率
英文关键词:polyvinylidene fluoride/graphene composites; effective medium theory; thermal conductivity
基金项目:国家重点研发计划项目(2017YFB0406000)
作者单位
胡济珠 同济大学物理科学与工程学院声子学与热能中心 上海 200092 
董 岚 同济大学物理科学与工程学院声子学与热能中心 上海 200092 
卢婷玉 同济大学物理科学与工程学院声子学与热能中心 上海 200092 
徐象繁 同济大学物理科学与工程学院声子学与热能中心 上海 200092 
周 俊 同济大学物理科学与工程学院声子学与热能中心 上海 200092 
摘要点击次数: 74
全文下载次数: 498
中文摘要:
      芯片散热问题限制了芯片技术的进一步发展,寻求高热导率的热界面材料成为突破该瓶颈的 重要手段之一。有机-无机复合材料由于其柔软性以及热导率可调控,有望取代常规材料——硅脂,成 为新一代热界面材料。实验上,有机-无机复合材料的制备方法包括物理混合、分相析出和原位氧化。 该文采用物理混合方法制备聚偏氟乙烯/石墨烯复合材料,并使用非稳态测量方法得到其热导率高达 83 W/(m·K)(温度 T=360 K、体积分数 f=76 vol%)。此外,复合材料的热导率与填料的体积分数、颗 粒大小形状以及填料与基体之间的相互作用等因素密切相关,利用改进的有效介质理论 Bruggeman 模 型和 Agari 模型来解释复合材料热导率的物理机制时发现,改进的有效介质理论 Bruggeman 模型并不 能很好地解释该复合材料的高热导率。由 Agari 模型可知,当填料含量较高时,填料之间更容易形成 导热通道,从而提高了复合材料的热导率。
英文摘要:
      Heat dissipation problems have limited the further development of the chip technique, therefore, searching for thermal interfacial materials with high thermal conductivity becomes one of the most important methods to break through the bottlenecks. Among these thermal interfacial materials, organic-inorganic composites are believed to be a promising alternative of the traditional silicon grease, due to their flexibility and controllable thermal conductivity. The fabrication methods of organic-inorganic composites, such as physical blending, phase precipitation, in-situ oxidation have been widely adopted on experiment. In this paper, we fabricated the polyvinylidene fluoride/graphene composites by using physical blending method, and their thermal conductivities could achieve as high as 83 W/(m·K) by using non-steady measurements with temperature T=360 K and volume ratio f=76 vol%. Furthermore, the thermal conductivity of the organicinorganic shapes, and the interactions between the organic and inorganic materials. We adopted the improved Bruggeman model and Agarimodel based on the effective medium theory to explain the thermal transport mechanism. Investigation results showed that, improved Bruggeman model cannot interpret the reason of high thermal conductivity of composites. The larger the fraction of the fillers, according to Agari model, the easier could the thermal conductive channels form among the fillers, thus the higher the thermal conductivities of these composites. composites is highly depends on factors including the volume ratio of the fillers, grain sizes and
查看全文  查看/发表评论  下载PDF阅读器
关闭
微信关注二维码 用微信扫一扫

美女

美女图片

美女

美女图片