Research and Development of High Friction Coefficient Composited Brake Pad of New Railway Vehicle
|Course||Materials Processing Engineering|
|Keywords||Matrix Filler Friction Materials Friction and wear properties|
With the continuous improvement of train speed, brake and brake material also put forward higher requirements. On the one hand, the train speeds increased, the traditional train foundation brakes and the vehicle's braking system technology update their concepts, and the objective requirements of the introduction of state-of-the-art technology. On the other hand, the key components of the train braking technology brake shoes and brake disc / brake lining performance and preparation techniques are also proposed more stringent requirements. It is because of the train speeds towards the high-speed development, provided the original impetus to the the train brake friction materials and their components preparation process technology research and development, shows a broad market. The performance of the merits of the material of brake components, will directly affect the braking effect is good or bad. The right choice for the formulation of the resin matrix composites, reasonable structure design, in order to achieve the best use of effects is very important. In this paper, the cast as a dual matrix of resin-based friction materials, fillers friction material friction and wear properties of cast steel / resin matrix, and explore a more reasonable formulation of brake shoe. The study showed that: the increased friction element to increase the hard phase filler chromite, corundum content, can be improved to a certain extent the friction coefficient of the brake shoe, the amount of wear is also a corresponding increase. Chromite content of less than 7%, the sample was measured under high brake initial velocity the low coefficient of friction; were lower than the content of higher than 8%, the coefficient of friction of each of the brake initial velocity of 7 % to 8% of the sample, but the wear is slightly larger. Better friction and wear properties of the chromite content control specimens between 7% to 8%, the friction coefficient of the high initial braking speed greatly improved, and the curve is very smooth friction brake noise. low, basically achieve the expected goals of the experiment. Corundum can be improved by adding a small amount of the friction coefficient of the brake shoe, but the effect is not obvious. Corundum content in the 3% preferred, and when the content is more than 3%, resulting in the steel fiber pullout sparks and larger noise generated during braking. Less friction element studies showed that: the content of calcined coke as the braking curve of the 3% of the sample in the different brake initial velocity is very smooth, and its high-speed, the friction coefficient was no significant reduction. However, when the amount of calcined coke is increased to 5%, the curve fluctuations, while producing restore damage brake dual brake noise problems. The silane coupling agent after the surface treatment enhances the affinity between the inorganic filler and organic, to improve the interfacial adhesion strength of the inorganic filler and the resin matrix, so that the friction material has good processing properties, while the amount of wear of the material of the filler reduce by half, increase the coefficient of friction. Lubricating element of Calcined coke, quality percentage of 3%, and the best overall performance of the silane coupling agent surface treatment of resin-based friction materials for filler.