碳纳米管-碳纤维/水泥基材料微观结构和热电性能

摘要

The microstructure of the cement pastes was investigated by scanning electron microscopy.Thermoelectric properties of carbon nanotube-carbon fiber/cement composites were also measured during the heating and cooling process.Results show that carbon nanotubes act as fillers,which results in a dense microstructure of cement paste,when carbon nanotube is at a low content (less than 0.5 ％ by mass of cement).The doping of CNTs leads to a highest increase (up to 260％) reaching 22.6μV/℃ in the positive thermoelectric power of the cabon fiber/cement composites,when CNTs addition reaches 0.5 ％ by weight of cement.Besides,the linearity and reversibility of the Seebeck effect was improved.%研究了碳纳米管-碳纤维/水泥基材料的微观结构以及碳纳米管-碳纤维/水泥基材料升温与降温过程中的热电性能.实验结果表明,当水泥基材料中碳纳米管掺量较低时(碳纳米管掺量占水泥质量百分比不高于0.5％),碳纳米管能有效改善水泥基体性能,密实基体结构.在碳纤维水泥基材料中掺入碳纳米管能有效提高和改善复合材料热电性能;当碳纳米管掺量为水泥质量0.5％,水泥基材料热电势率最多能提高260％,达到22.6μV/℃.与此同时,碳纳米管掺入能增强热电效应中温差电动势与温差关系的线性规律和可逆性规律.