高摩擦系数合成闸瓦金属镶嵌物的宏、微观特征研究

Study on the Macrocosmic and Microcosmic of Metal-inlay in Composition High-friction Coefficient Brake Shoe

影响高摩擦系数合成闸瓦推广使用的一个最主要的因素就是金属镶嵌问题 ,尤其是随着列车运行速度的不断提高 ,这一问题更加显得突出。利用从现场获得的大量材料 ,本文对高摩擦系数合成闸瓦中广泛存在的金属镶嵌物进行了较深入的宏、微观研究。在此基础上提出了金属镶嵌物的形成模型———“三步聚集”模型 ,第一步为钢磨屑聚集成为金属镶嵌点状物 ,第二步为金属镶嵌点状物聚集成为金属镶嵌条状物 ,第三步为金属镶嵌条状物聚集成为金属镶嵌块状物 ;并将金属镶嵌物分为三类。据此 。

Metal inlay is the chief obstacle in extending the use of composition high friction coefficient brake shoe. This problem becomes more obvious when train speed is increased. Using plenty of data collected from site, this paper makes a thorough research of macrocosmic and microcosmic metal-inlay existing in composition high friction coefficient brake shoe. On this basis a model of metal inlay is formed, which is named ″congregate trilogy″. The first step is steel scraping congregate into metal inlay particles, the second step is to congregate metal inlay particles into metal inlay bars, the third step is to congregate the metal inlay bar into metal inlay agglomeration. And then, the metal inlay is classified into three sorts. Furthermore discussed is the direction of research on eliminating or decreasing the metal inlay to a harmless level.