Friction and wear properties of particle reinforced graded aluminum matrix composites

The Al-17Si functionally graded material(FGM) with SiC volume fraction of 0-30% continuously were synthesized using new spray deposition technique.Furthermore,the microstructure,hardness and wear ability of this functionally graded material were studied with SEM,MHV-2000 Hervey hardness tester and MG-2000 pin-on-disc friction and wear testing machine.The results show that the friction coefficient decreases with increasing the applied load and sliding speed.The wear rate rises with the increase of applied load and it reaches the maximum at speed of 500r/min firstly,and then falls with increasing the sliding speed.Because of the existence of defects,such as the hole,the mainly wear way of the deposition is abrasive and delamination,while the composites after hot pressing is mainly abrasive and adhesive.The hardness and wear resistance of every part of materials increase with increasing the SiC content in the deposition billet.