The graphite-copper slider is an important part of the maglev train, and it is a key component for the maglev train to introduce the current on the third rail into the maglev train body to provide electricity when the maglev train is running at low speed (<100km/h). The working environment of the graphite copper slider has problems such as high speed, impact, and poor lubrication. It is one of the most frequently replaced and most consumed components in maglev trains. Poor sliders will affect the life of the conductive system, and have a great impact on the safety and operating costs of maglev trains.
In recent decades, a lot of research on slider materials has been carried out at home and abroad, mainly through the development process of metal, pure carbon, powder metallurgy, immersion metal and carbon fiber composite materials. Copper-based powder metallurgy slider material is still considered to be the best choice for rail transit due to its good mechanical strength, moderate surface hardness and low production cost. Graphite has been widely used in copper-based powder metallurgy composite materials. The copper/graphite composite material is uniformly mixed with graphite particles on the copper matrix by the powder composite method. In addition to retaining the good electrical and thermal conductivity of copper, it also has graphite particles. Solid self-lubricating properties and anti-welding effect. However, this type of material has pore defects, which will affect the mechanical properties of the material. The physical properties of the material can be improved by properly controlling the sintering process, compact density, alloying element formulation combination, powder particle size and other measures.