Effect Of Ti₃SiC₂ On Friction And Wear Properties Of Fe Based Sliding Bearing Materials

Cast iron is widely used as a cheap metal material,and its properties can be used in many applications,iron has some defects which cannot be ignored,such as susceptible to oxidation,corrosion resistance and poor resistance to high temperature performance deviation defects have great limitations in demanding conditions,in recent years the domestic and foreign scholars tried to use the alloying elements and ceramic elements to improve the mechanical and friction properties,according to railway wear sliding bearing under high temperature and carries out a series of research.To add lubricating material Ti₃ SiC₂ to the iron matrix in order to reduce the friction coefficient between the bearing and the shaft,reduce energy loss and improve the service life of the bearing.Ti₃SiC₂ as a new layered compound with ceramic and metal properties,its layered structure similar to graphite,graphite and self lubrication can be comparable,and its high temperature oxidation performance is much better than that of graphite,Ti₃SiC₂ graphite alternative application in the high temperature friction condition has become an inevitable trend.This paper has used ball mill and spark plasma sintering process of iron base metal powder and Ti₃SiC₂ mixture and preparation,the paper is divided into three parts: Ti₃SiC₂ block material preparation,preparation and properties of iron-based matrix and Fe-x%Ti₃SiC₂ composite material preparation and performance study.Vibrating mill and screening method will be prepared to obtain experimental requirements of Ti₃ SiC₂ size;the metal powder of different iron matrix materials according to the mass ratio of ingredients,after mixing at different sintering temperatures by plasma sintering and sintering of iron-based matrix analysis and mechanical properties tribological properties of iron-based matrix,select the optimal formula;by a similar method to select the optimal formula of iron matrix and Ti₃SiC₂ particles mixed sintering preparation of Fe-x%Ti₃SiC₂ composite materials,in the preparation process were discussed.The impact of the two sintering temperature,Ti₃ SiC₂ content and grain size parameters on the overall mechanical properties andfriction properties of Fe-x%Ti₃SiC₂ composites.The wear mechanism in wear process are analyzed.The experimental results show that when the mass fraction of Cu is 7wt% ratio matrix mechanical properties is the most excellent,Ti₃ SiC₂ content is 30vol%,the size range of 60⁸0 mesh,Fe-30%Ti₃SiC₂ composite materials meet the strength requirements and have excellent tribological properties,corresponding sintering temperature was 1000?,Fe-30%Ti₃SiC₂ composite lubricating good at high temperature of 500?,the friction and wear mechanism of high temperature under500 ? to slight abrasive wear.