掺石墨导电SMA的电学性能  

Electrical Performance of Conductive SMA Containing Graphite

作　　者：丁庆军[1] 吴学伟[1] 刘新权[1] 沈凡[1] 胡曙光[1] 

机构地区：[1]武汉理工大学材料科学与工程学院,湖北武汉430070

出　　处：《建筑材料学报》2009年第1期121-126,共6页Journal of Building Materials

基　　金：国家高技术发展计划(863计划)资助项目(2006AA11Z117)

摘　　要：以石墨为导电相材料,制备了导电沥青玛蹄脂碎石(SMA)混合料;设计了一种埋入式电阻测试方法,研究了掺石墨导电SMA的电学性能及导电机理.研究表明:石墨的掺入可有效改善SMA电学性能,通过分形模型可知:由于不同种类石墨的模型参数不同,其改善沥青混合料电学性能的效果不同;掺石墨导电SMA的电学性能稳定,不会随着时间的推移出现突变;随着石墨掺量的增加,导电SMA电阻率对温度的敏感性逐渐降低,线性V-I特性愈加明显;导电SMA的导电机理是导电通路、隧道效应和场致发射效应三者共同作用的结果,依据这3种导电机理可解释沥青混合料电学性能随外部因素变化的原因.Conductive stone mastic asphalt（SMA） mixture is a kind of asphalt pavement material with excellent electrical performance, produced through adding conductive paste material to mixture. Conductive SMA mixture was produced by using graphite as conductive particle, and a kind of resistance test method of embedding showerhead electrode was designed. Research shows that graphite can improve electrical performance of SMA mixture effectively. Fractal theory indicate that different graphites have various effect on improving electrical performance of mixture. The electrical performance of conductive SMA mixture containing graphite is steady, and it won＇t change with time; with the increase of graphite content, temperature sensitivity of resistivity of conductive SMA decreases gradually and its linear V-I characteristic is more obvious. The conductive mechanism of conductive SMA is the result of combined action of conductive pathway, tunneling effect and field emission. The reason why the electrical performances of conductive SMA mixtures change with external factors can be explained by three conductive mechanisms.

关 键 词：沥青玛蹄脂碎石(SMA) 石墨 电学性能 导电机理 

分 类 号：U414[交通运输工程—道路与铁道工程]