Ti3SiC2 is a new type of cermet material,which has good thermal conductivity,corrosion resistance and high temperature oxidation resistance.The effect of Ti3SiC2 replacing graphite as a lubricating phase on the properties of friction materials in the powder metallurgical brake plate of EMU was explored.By adding different content of Ti3SiC2 replacing graphite in the friction material of powder metallurgy brake,the change of oxide film on the friction surface was observed,and the effect of the addition of Ti3SiC2 on the mechanical properties and tribological properties of brake friction material was analyzed.The results show that with the increase of Ti3SiC2 replacing graphite,the shear strength of the friction material gradually increases.When Ti3SiC2 is used to replace all graphite(18% in mass fraction),the shear strength increases by 6 times.When the initial braking speed is 350 km/h,oxide film is formed on the friction surface.With the increase of the amount of Ti3SiC2,the coverage area of oxide film increases and shows continuous distribution.When the mass fraction of Ti3SiC2 replacing graphite is more than 9%,the wear loss and friction coefficient of the friction material decrease significantly,the friction coefficient decreases by 36.8% and the wear loss decrease by 67.5% when replacing all graphite with Ti3SiC2.