A356/SiC_P与列车实用中的有机闸片的滑动摩擦磨损特性

Wear Characteristics of Dry Friction between the A356/SiC_p Composite and Applied Organic Brake Pad of Medium Speed Train

以铝基复合材料作为列车制动盘材料的实用化为目的，选用A356／SIC 20％（体积分数，下同）复合材料和AISI D2工具钢为摩擦材料，以中速列车实用中的有机闸片为对偶材料，进行对比干摩擦磨损试验，并分析比较了磨损特性。结果表明：铝基复合材料在小于200Y（3．98MPa）的低载荷下，只存在轻微的氧化磨损，耐磨性比实用中的铁合金材料更好；而超过该载荷时。开始发生磨削磨损，磨损量逐步超过铁合金材料，当载荷达到400N（7．96MPa）时，由于严重的磨削磨损，磨损量剧增。而铁合金材料则随载荷和滑动速度增加，磨损率缓慢增加；磨损过程中的复合材料的摩擦系数平均值与载荷、滑动速度无关，始终保持0．3～0．4，同时随磨损距离的波动也非常小，而工具钢的摩擦系数平均值则对试验参数的敏感度相对大些，且摩擦系数平均值也比复合材料略小，即摩擦系数方面复合材料具有更好的特性。

In order to use aluminum composite as train brake disc, the dry sliding friction wear comparison test had been carried out and wear characteristics were analyzed using A356/SIC （20vo1%） composite and AISI D2. tool steel with organic brake pad of medium speed train as a friction couple. The result showed that there was mild oxidative wear for the aluminum composite under load less than 200 N （ 3.98 MPa）. The wear resistance of the aluminum composite was better than that of applied ferroalloy. When the load exceeded 200 N （ 3.98 MPa）, cutting wear occurred, the wear quantities of the aluminum composite exceeded that of ferroalloy step by step. When the load was 400 N （7.96 MPa）, the wear quantities increased with a leap due to severe cutting wear. The wear rate of ferroalloy increased slowly with load and sliding speed increasing. The average friction coefficients of the composite was independent of load and sliding speed in course of wear, which retained along from 0.3 to 0.4, and it was a little change with wear distance. However the average friction coefficients of tool steel had more sensitivity with test parameter relatively. It was less than a little that of the composite, namely the friction coefficients of the composite had better characteristic.