Analysis And Optimization Of The Automotive Brake Frictional Couples

Automotive Brake Frictional couples are the key safety parts in the braking system. There have been achieved great developments on automotive friction materials including materials and fabricating process abroad as well as many new non-asbestos friction materials. Compared with foreign countries, there is a big gap in the research of friction materials in our country. In particular, as the driving speed increases, the automobile friction materials must have stable friction and wear properties at high temperatures. The development of new friction materials tends to rely much on experience and the evaluation of the components of friction materials involves many factors such as mechanical properties, friction, cost, and so on, therefore the development and application of new friction materials are the complicatedly systematic problems, which remains many challenges.This paper analyzed the existing Friction throughly, explored the failure mechanism of Automotive Brake Friction and the formulation orthogonal optimal design in Automotive brake friction material. The order at different temperatures of each component, the friction and wear behavior was investigated by using an XD-MSM wear tester. The mechanical properties of the friction materials such as strength, hardness, are tested. The mechanism of friction and wear of different temperature range was discussed by the analysis of the results of Friction and wear test through SEM and EDS. Compared with other high quality products which from domestic and foreign. Obtained the test results through research and analysis as follows:The multi-fiber-reinforced friction material of automotive brake was prepared with binder resin which contains both modified phenolic resin and powder nitrile rubber and made up with a variety of reinforcing fibers mixed such as kevlar pulp, ceramic fiber, mineral fiber, copper fiber and steel fiber. The test results show that the development of the automotive brake friction materials have sufficient mechanical properties and excellent friction and wear properties. when the content of steel fiber and total fiber are 2.5% and 30.5% respectively, it has the best performance. According to the studies of the Mechanism of friction and wear, the mechanism of abrasion is mainly adhesive wear and abrasive wear in low temperatures(≤150℃), and abrasive wear and oxidation wear in the mid-temperature(150℃～250℃), while in high temperature(≥250℃) it was dominated by oxidation wear and fatigue wear mechanism.The new less-metal friction material of automotive brake was prepared with binder resin which contains both modified phenolic resin and powder nitrile rubber, and made up with a variety of reinforcing fibers mixed such as ceramic fiber, copper fiber,Cellulose and steel fiber. The test results show that the development of the less-metal automotive brake friction materials have the best performance when the ceramic fiber content of 8%, and the total fiber content of 30%. Compared with other high quality products which from domestic and foreign, The newly developed less-metallic brake friction coefficient is relatively stable, the wear rate is moderate, noise-free braking process, thermal recession better performance.