| As an important part of friction material, Matrix determines the mechanical properties, friction and wear properties, thermal stability and conductibility mainly by its micro-structure and mechanical properties.The mechanism about friction and wear of Cu-Sn based friction material and behavior of Fe and SiO2 in the course of matrix's friction and wear have been discussed by researching the micro-structure, physical and mechanical properties and friction and wear properties of matrix. The friction and wear properties of Cu-Sn-Zn, Cu-Sn-Ni and Cu-Sn- Zn- Ni based friction materials have also been discussed together in this scientific dissertation. The results show:(1) Sn content and rotational speeds have important effects on the friction and wear of matrix. With Sn content and speed increased, the wear volume increases but the frictional coefficient decreases. The rotational speed changes, then the wear mechanism changes also. At low speeds, adhesion and plough wear are the main mechanism, but flake and oxidation wear takes on priority at high speeds. Oxide film can make the frictional coefficient decrease, if it's joint intensity with matrix is weak, then the wear volume increases.(2) Fe and SiO2 can increase frictional coefficient, but their mechanism are different in friction because of their different property,joint intensity with matrix and surface state. SiO2 increases coefficient more than Fe, while those lie in the surface are often crushed into many small debris, so debris wear is happened. When Fe content increase, Frictional coefficient and wear volume increase also, there are many micro-cracks on the oxide film, it can reduce the intensity of these films.(3) Zn and Ni can increase the friction and wear property by adding itself into Cu-Sn alloy material, when the Zn content increases, the frictional coefficient of matrix decreases, while wear-proof can be better with Ni content increasing. It's better to improve material properties with Ni than with Zn element. |
PDF Full Text Request