A self-lubricating composites filled with polytetrafluoroethylene with AlSi10 Mg as the matrix was prepared by selective laser melting（SLM）

impregnation and vacuum sintering.The friction and wear behavior were investigated by reciprocating Bruker UMT-3 friction tester under different loads（10

30

50

70 N）at a given speed（5 mm/s）.The composition and structure of the composites prepared were characterized by SEM and EDS.The tribological behavior test was carried out on a ball-on-disc mode.The results reveal that the average friction coefficient and wear rate of the composites are increased firstly and then decreased with the increase of the load.The friction stability of the composite is mainly determined by the PTFE stored in the skeleton.The friction mechanism is mainly that when the friction surface is worn under the action of load

the PTFE stored in the skeleton will capture the abrasive debris to form a complete PTFE lubrication film

and to transfer the film

thus increasing the tribological stability of the composites.