Materials Processing Analysis Of Copper Powder Metallurgy High-speed Train Brake

With our national railway speeding up widely, people pay much more and more attention to the safety of high-speed train safety, especially have more rigorous requirements of brake in braking system, and make further studies on properties of braking materials. Based on this background, buying an existing pair of high speed train brake pad form some Railway Administration, this paper analyzes the technology of copper-based powder metallurgy brake pad and tribological properties, succeeds in three distinctive kinds of components of copper-based powder metallurgy brake pads, and makes a comparative study on the four kinds of friction and wear properties.In the MM-1000II-type friction and wear testing machine, we respectively trial four kinds of materials of copper-based powder metallurgy brake and friction composed of the GCr15 steel to test tribology properties of four different kinds of braking materials at different braking speeds and different braking pressure. We also analyze surface organizations and form of paired materials by making use of scanning electron microscopy (SEM), etc.. Then we discuss the copper powder brake friction and wear mechanisms.The results show that: brake materials technology we designed is feasible, the tribological properties of all the three copper-based powder metallurgy brake pad meet the requirements. With the brake speed increasing, the friction coefficients of three types of brake pads have shown an increasing trend. Entirely, FA integrated friction and wear properties of materials is better than the other two materials. Among the three levels, FA friction coefficient increased is the smallest in the process of braking speed, and also this material turns out to be stable. Meanwhile, the wear volume of FA material is lower than others. Moreover, the property of FA brake pad and brake at high speed has been better than the existing high-speed train brake pad.From the analysis, the results are caused by different group elements of this material. Metallic friction material element Fe of FA is from 8% to 10%. Non-metallic friction group element SiO2 from 1% to 3% has much better friction and wear properties, much more stable friction coefficient, much stronger anti-interference ability and its lower wear.