Research And Development Of High Friction Coefficient Composited Brake Pad Of New Railway Vehicle

Brake device and brake materials have been improved with the acceleration of the train speed. On one hand, the objective requirements of updated concept of technology and advanced technology on the basis of the traditional train brake and vehicle braking systems are present with the improvement of train speed. On the other hand, more and more strict requirements for the performance and preparation of technology of the brake pad and the brake disc/brake shoe as key components for train braking technology are present. The original impetus and a broad market are provided for the research on brake friction materials and preparation of the components with the advancement of high speed train. Braking performance of the material components will directly affect the quality of the braking effect. In order to achieve the best effect, it is very important to choose the correct resin-based composite formula and design rational structure. In this paper, a dual steel was set as antithetic. Effects of the resin-based friction materials matrix, filler, etc. on steel/resin-based friction material friction and wear properties were investigated and a more reasonable formula brake pad was gained/achieved.Research on the increasing the friction element shows that: an increase of packing rigid chromite, corundum content, to some extent, are able to raise the brake shoe friction coefficient and increased wear volume. The sample in which content of Chromite less than 7% in the beginning of the high-speed braking measured a lower coefficient of friction; More than 8 percent, at the beginning of the various braking speeds were lower than the content of the friction coefficient of 7 % ~ 8% of the sample, but slightly larger wear. When the content of chromite is control between the 7% ~ 8% , the friction and wear properties of the sample is better, in the beginning of the high-speed braking friction coefficient had a greater increase in friction and a very smooth curve, and a lower brake noise, and the basic experiment is expected to reach the goal. Adding a small amount of corundum can increase the friction coefficient of brake pad, but the result is not obvious. Corundum content in the 3% is better than 3% concentration, resulting in the pull-out of steel fiber in the braking noise and larger sparks.The study of friction-reducing element shows that: the sample curve of the braking calcined 3% coke content with the brake in the beginning of different speeds are stable under the high-speed with no significant reduction in friction coefficient. However, when the amount of calcined coke increasing to 5%, the curves fluctuation at the same time have been restored, damaged dual brake and brake noise. The affinity between inorganic filler and organic is enhanced through surface treatment on Silane coupling agent and interface viscosity between inorganic filler and resin-based is improved in order to achieve a fiction materials with excellent properties. Friction coefficient can be improved when the amount of materials abrasion reduce by half. With element for lubricating calcined coke, the quality percentage 3%, and silane coupling agent on the filler to the surface treatment of resin-based friction materials shows the best comprehensive performance.