Study On The Matching Between Gray Cast Iron Under Bionic Coupling Treatment And Brake Pads

Along with the rapid and intensive development of vehicles, braking safety receivesextensive attention of people. Frequent braking can cause the surface temperature of brakedisc rising, wear speeding up, and friction coefficient decreasing, and lead to prematurefailure eventually. According to the principle of bionics and a deep understanding andmastery of typical biological coupling mechanism, make hard bionic units with certaingeometry on the surface of brake disc, which can significantly improve the wear-resistanceof brake discs because of the soft-hard groups of substrate and bionic units. However, inthe practical application of bionic brake disc, it exposes problems of intensifying damage tobrake pads and mismatching between tribo-couples, which greatly reduces the service lifeof pads and brings much inconvenience to improve the overall safety and life cycle ofbrake system. In order to reduce the loss of brake pads in the premise of improving thewear-resistance of the brake disc, and to make great matching of tribo-couples, the unitdistribution of bionic disc and pad formula have been regulated in this paper. Underlaboratory conditions, it compared the wear properties of non-treated disc abraded withpads and that of bionic discs, and explored the effect of bionic treatment on wear resistanceof tribo-couples. At the same time, the study also focused on the influence of themorphology and spacing of the bionic units on the wear properties. In addition, weprepared several kinds of hybrid fiber brake pads in different content, and the wear testwith bionic discs was also carried out.Research results show that wear losses of pads are different with unit morphologychanging. Under the same condition, the wear losses of brake pads abraded with gridsurface are the most, those of brake pads abraded with cave surface are the fewest, andthose with stripy surface are among them. The difference of wear losses is decided by theform and area of bionic units on the contact surface. When the unit shape is constant, wecan reduce the damage of brake pads by changing the spacing of bionic units. But it will also reduce the wear-resistance of brake disc at different levels. Taking into account theshape and spacing factors of bionic units, increasing spacing of stripy units appropriatelynot only ensure the improvement of disc wear-resistance, but also reduce the wear losses ofpads, which make tribo-couples show better matching. In addition, the brake pads withdifferent composite mineral fiber (FKF fiber) content all meet the national requirements forthe abrasion performance of the brake friction materials. FKF fiber pads show greatresistance of wear when abraded with bionic disc, and among them, FKF fiber content for27wt%and bionic disc match best.