和谐型大功率内燃机车高摩合成闸瓦的研制

以丁腈橡胶改性酚醛树脂为黏合剂,石墨、铝矾土、钾长石粉、还原铁粉和沉淀硫酸钡等为填料,钢纤维和海泡石纤维为增强纤维,混合构成了高摩合成闸瓦的摩擦材料;通过反复实验,优化配方及工艺,研制出适合我国和谐型大功率内燃机车运用需求的高摩合成闸瓦。测试结果显示:研制的高摩合成闸瓦的各项物理力学性能及制动摩擦磨损性能符合和谐型大功率内燃机车的技术要求,其中冲击强度和压缩模量分别达到3.8kJ.m-2和460MPa。在1∶1制动动力试验台上的测试也显示,在120km.h-1速度下重车的制动距离以及车轮踏面最高温度和磨耗量分别为817m,215℃和0.87cm3.MJ-1,完全满足120km.h-1速度下紧急制动距离小于1 100m、车轮踏面最高温度小于400℃、重车制动磨耗量小于1.5cm3.MJ-1的使用要求,综合性能达到了国外同类型高摩合成闸瓦的水平。

Development of Composite Brake Shoes with High Friction Coefficient for High Power Diesel Locomotive (HXN)

Nitrile butadiene rubber modified phenolic resin was used as adhesive.Graphite,bauxite,potash feldspar powder,reduced ferrous powder and precipitated barium sulfate were used as filler.Steel fiber and sepiolite fiber were used as reinforcing fibers.The friction material of composite brake shoe with high friction coefficient was constituted by the blend of the above materials.Composite brake shoe with high friction coefficient for high power diesel locomotive was developed through optimizing technology and formula by trial and error.Test results show that all the physical,mechanical,braking,friction and wear properties of the developed composite brake shoe with high friction coefficient meet the technical requirements of high power diesel locomotive(HXN).The impact strength and compression modulus reaches 3.8 kJ.m-2 and 460MPa respectively.Tests of 1∶1Train braking dynamic test stand also show that,at the speed of 120km.h-1,the braking distance of the loaded car,the maximum temperature of wheel tread and abrasion loss is 817m,215℃ and 0.87cm3.MJ-1 respectively,which can fully meet the operating requirements of emergency braking distance less than 1100m,the maximum temperature of wheel tread less than 400℃and the braking abrasion loss of loaded car less than 1.5cm3.MJ-1 at the speed of 120 km.h-1.The compressive properties of composite brake shoes with high friction coefficient have reached the level of the same type foreign products.