Pengaruh Kandungan Serbuk Grafit terhadap Kekerasan dan Densitas pada Paduan Serbuk Logam Fe-Cr.

Metal matrix composites can be produced by powder metallurgy (P/M) route. Product of P/M generally has porosity that affects physical and mechanical properties. The aim of this research is to investigate the effect of graphite addition to physical and mechanical properties of Fe-Cr composites. Materials used in this research were Fe-Cr one powder) as a matrix and graphite powder as a reinforcement. The content of the reinforcement are 00,511,5 dan 2 wt% of graphite. Powder was pressed at 400 MPa at room temperature and 200° C to build a green body. The green body was then sintered at 900 °C for 2 hours. Physical and mechanical properties tested were Vickers hardness, optical microscopic and relative density. Results show that the addition of graphite up to 1 wt% increases the hardness and the density of Fe-Cr/C composites. Hardness and density of a specimen containing 1 wt% graphite which was compacted at room temperature are 52 VHN and 93% respectively whereas a specimen compacted at 200° C has hardness of 148 VHN and density of 97%. A graphite free specimen has hardness of 34 VHN and density of 68%. Keywords: Power metallurgy, Fe-Cr/C composite, sintered, hardness, relative density