Research Of Ceramic-based Friction Material And Its Temperature Field Of Friction Pair

The rapid development of science and technology, speed up the high-speed and overloading process of cars, trains and other means of transport, it thus demand more for brake device, as a core part of the brake friction material, it demand higher performance, friction material has been widely studied at home and abroad, ceramic based friction material has the advantages just like low density, good wear resistance, corrosion resistance and so on, especially the Al2O3ceramic, it has great potential for application, this article use Al2O3, clay and feldspar as the composite matrix, add a variety of fiber to prepare the ceramic-based friction materials under conditions of the sintering of gas protection and study the performance of the hybrid fiber-reinforced ceramic-based friction materials, at the same time, the geometry model and energy transformation model of friction braking of brake were builded, and its temperature field were calculated, finally, it has been certificated through bench experiment.The main research work and achievements are as follows:1. Use steel fiber as the main reinforce body, ceramic-based friction materials of steel fiber/alumina ceramic fiber hybrid reinforced were prepared, and its performance of the material prepared under the conditions of pressure sintering and no-pressure sintering were studied. The result show that the wear rate of friction material prepared by pressure sintering is much lower than the one by no-pressure sintering, pressure sintering help to reduce the wear rate, the friction coefficient of the two kinds of material are basically the same;2. Ceramic-based friction materials of steel fiber/brass fiber hybrid reinforced were prepared, performance of ceramic based friction material of steel fiber/brass fiber and fiber/brass fiber hybrid reinforced were comparative analyzed, the results showed that the mechanical properties of the material of steel fiber/ceramic hybrid fiber enhanced are better, but has serious heat recession, friction coefficient of the material reinforced by steel fiber/brass fiber is low but very stable, the effect of different contents of copper fiber and ceramic fiber on ceramic-based friction materials were studied based on this study, the results showed that the ceramic fiber ceramic has the role of improving the friction coefficient of ceramic-based friction material and brass fiber has the role of smoothing friction coefficient; 3. The material of steel fiber/ceramic fiber/brass fibers hybrid reinforced were prepared by adding brass fiber and ceramic fiber based on the material of steel fiber/ceramic fiber and steel fiber/brass fibers hybrid reinforced, studies have shown that the coefficient of friction of ceramic-based friction material reinforced by the three hybrid fiber enhanced is higher and the wear rate is lower; orthogonal experiments of friction materials reinforced by three kinds of fiber were done, and get a better fiber combination of friction and wear properties.4. The situation of temperature distribution for friction pairs device in the braking process and the effect of material thermal parameters on its temperature field were investigated. The results show that in the braking process of the disc brake, the high temperature place is located on the area of sliding out with the friction plate along the disk rotates direction; the surface temperature of brake disc decrease from the high temperature zone along the direction of the brake disc rotation; surface temperature of friction plate decrease along the opposite direction of the brake disc rotation; the maximum radial temperature of the brake disc and friction plate in the braking process is located on the central part of the friction zone, the temperature of the outside radius and inside radius is lower, the temperature of the axial direction decrease from the friction surface layer to the inner layer direction, it provide a reference for the determination of work temperature, detection position of the friction material and the structural design of brake;5. It can reduce the maximum temperature value of friction deputy surface by increasing any thermal parameter of the brake or friction plate, but compared to the friction plate, the effect of thermal conductivity,specific heat capacity and density of brake disc is much greater than the effect of friction plate’s on the temperature of the friction deputy, the research content can provide a reference for material selection of brake, the friction deputy temperature field of ceramic-based friction material during the process of braking through the bench experiments were studied, the results showed that the experimental results have good agreement with the simulation results;The research work of the article can provide technical guidance for the development of high-performance ceramic based friction material, structure design and material selection of the device composed of friction pair of friction material.