Study On Irradiation And Tribological Properties Of Ti₃SiC₂

As one of the most widely studied MAX phase ternary layered compounds,Ti₃SiC₂ combines the superior properties of metals and ceramics,and has good radiation resistance properties.It was expected to be used in next-generation nuclear reactor facilities.Ti₃SiC₂ also has excellent tribological properties in high-temperature environments,and has a vast application prospect in the field of high-temperature lubricating materials.This experiment studied the changes in the morphology and crystal structure of Ti₃SiC₂ material after irradiation,and analyzed the electron irradiation mechanism.The friction and wear properties of Ti₃SiC₂ at different rotational speeds and temperatures have been studied,and the friction and wear mechanism has been explored.Irradiation damage under electron beam irradiation energies of 120 ke V and 200ke V on Ti₃SiC₂ was investigated in this study.The surface of material became rough under 120 ke V and caused by the electron beam sputtering.Under 200 ke V electron irradiation,the surface damage was more serious.Diffraction spots with low intensity of some crystal planes due to the displacement of Si atoms at 200 ke V.Point defects caused by irradiation reduced the a-axis lattice constant by 1.8%.However,even after irradiation for 600 s,no amorphous ring was observed.The density of Ti₃SiC₂ bulk material by hot-press sintering at 1250℃and 30 MPa for 1 h is 96%.The effects of rotation speed and temperature on the friction and wear behavior of materials has been investigated.At high speeds,the friction coefficient and wear rate of Ti₃SiC₂ materials decrease with the increase of sliding velocity.Ti₃SiC₂material has good self-lubrication and wear resistance in high temperature environment.As the temperature rises,the wear rate and friction coefficient of Ti₃SiC₂ material decrease significantly,and the friction coefficient at 600℃is only 0.21.A layer oxide film formed on the friction surface of Ti₃SiC₂ material in high temperature environment,the oxide lubricating film has a lubricating effect,and can protect the friction surface from further wear.