轨道交通车辆用电缆绝缘材料热老化寿命评估方法  

The thermal aging life assessment of cable insulating materials used in rail transit vehicles

作　　者：王春锋[1] 周佳龙 王宏峰 梁斌 韩志东[1,3] WANG Chunfeng;ZHOU Jialong;WANG Hongfeng;LIANG Bin;HAN Zhidong(School of Materials Science and Engineering,Harbin University of Science and Technology,Harbin 150040;Zhongtian Technology Industrial Wire&Cable System Co.,Ltd,Nantong,Jiangsu 226010;Key Laboratory of Engineering Dielectrics and Its Application Ministry of Education,Harbin University of Science and Technology,Harbin 150080)

机构地区：[1]哈尔滨理工大学材料科学与工程学院,哈尔滨150040 [2]中天科技装备电缆有限公司,江苏南通226010 [3]哈尔滨理工大学教育部工程电介质及其应用重点实验室,哈尔滨150080

出　　处：《电气技术》2021年第12期14-21,共8页Electrical Engineering

摘　　要：本文研究轨道交通车辆用低烟无卤阻燃电缆材料的老化特性,并评价电缆在服役过程中绝缘材料的可靠性。以低烟无卤阻燃聚烯烃电缆料(HFFRPO)为研究对象,采用常规热老化寿命评估方法获得热老化的基础数据,用Boltzmann模型对热老化数据进行拟合并推导力学性能参数变化至50%时的时间参数,以此为依据拟合出老化寿命曲线。此外,利用差式扫描量热法(DSC)获得活化能计算HFFRPO材料的老化寿命。研究结果显示,以抗拉强度为依据推导出的老化寿命小于按断裂伸长率为依据推导的寿命;起始氧化活化能随材料的老化程度不同而发生变化,通过DSC获得的活化能不适宜用来推导材料的老化寿命,但可作为材料老化状态的重要参考指标。This paper studies the thermal aging behavior of low smoking halogen-free flame retardant polyolefin(HFFRPO)materials used in rail transit vehicles and estimates the reliability of the insulation during the long service.Conventional thermal aging life assessment method is adopted to get the basic thermal aging data of HFFRPO.The thermal aging data is further processed on the basis of Boltzmann model and then the time parameter when the mechanical property parameters decrease to 50%is deduced,based on which the thermal aging life curve is fitted.In addition,the thermal aging life is also calculated according to the activation energy obtained by differential scanning calorimetry(DSC).The results show that the thermal aging life derived from the tensile strength is less than that derived from the elongation at break;the initial oxidation activation energy varies with the thermal aging degree,and the activation energy obtained by DSC method is not suitable to deduce the thermal aging life of HFFRPO materials but as an important reference index of the aging state of materials.

关 键 词：电缆 低烟无卤阻燃 热老化 寿命 活化能 

分 类 号：U270.4[机械工程—车辆工程] U270.381[交通运输工程—载运工具运用工程]