摘要
聚碳酸酯(PC)是轨道交通设备连接器的常规使用材料,但是在服役过程中,易受多种因素(如热、光、湿度等因素)共同作用后其性能会逐渐退化,直至丧失使用价值。要确保列车安全可靠运行,有必要评估轨道交通连接器用PC材料的使用寿命,确定其有效服役期限,从而进行科学地维护检修。本文利用示差扫描量热分析(DSC)和扫描电子显微镜(SEM)技术研究了连接器用PC材料的微观形貌和热响应行为。其次,以热失重(TG)数据为基础,结合Arrhenius模型和Kissinger方法预测了PC材料在不同温度下的使用寿命。结果表明,PC表观活化能为141.02 kJ·mol^(-1),热降解壁垒较高,耐老化性能优异;PC材料在127℃条件下预测使用寿命为10.8年,随着温度升高,其使用寿命显著下降。热降解动力学参数和使用寿命预测Arrhenius模型和Kissinger方法能有效预测PC材料在不同温度下的使用寿命,为轨道交通连接器用PC材料的有效服役期限评估提供了重要的依据。
Polycarbonate(PC)is a commonly used material for the connectors of rail transit equipment.However,it is susceptible to deterioration by a combination of factors(e.g.heat,light,humidity,etc.)in service that can lead to gradual deterioration of its performance until failure.To ensure the safe and reliable operation of trains,it is necessary to evaluate the service life of PC materials used in rail transit connectors and to determine their effective service life for scientific maintenance and overhaul.In this paper,the microstructure and thermal response behavior of PC materials used in connectors were studied by differential scanning calorimetry(DSC)and scanning electron microscopy(SEM)techniques.Secondly,the service life of PC materials at different temperatures was predicted based on thermal weight loss(TG)data with the Arrhenius model and Kissinger method.The results show that PC has an apparent activation energy of 141.02 kJ mol^(-1),a high thermal degradation barrier and excellent ageing resistance.The predicted service life of PC material is 10.8 years at 127℃,and the service life decreases significantly with increasing temperature.The Arrhenius model and the Kissinger method can effectively predict the service life of PC materials at different temperatures,which provides an important basis for the evaluation of the effective service life of PC materials used in rail transit connectors.
作者
王学亮
周发明
李伟
罗娟
WANG Xueliang;ZHOU Faming;LI Wei;LUO Juan(CRRC Qingdao Sifang Co.,Ltd.,Qingdao 266111,China;Sichuan Yonggui Technology Co.,Ltd.,Mianyang 621000,China)
出处
《智慧轨道交通》
2023年第3期55-58,共4页
SMART RAIL TRANSIT
关键词
轨道交通
聚碳酸酯
寿命预测
热重分析
工程塑料
连接器
rail transit
polycarbonate
life prediction
thermogravimetric analysis
engineering plastics
connectors
