Effect of Fabrication Method by Powder Metallurgy on Frangibility Green Bullet Cu-10Sn as Eco-friendly Bullet

摘要

The bullet is used for immobilize object. However it can harm the shooter because it can be ricochet. Thus it, we develop frangible bullet which can be broken when hit the hard target. Conventional bullets are made of lead base material which poison. Therefore frangible bullet does not use lead as base material, so it is classified as green bullet. Green bullet is made by powder metallurgy method. Powder metallurgy process are measuring copper and tin powder, dry mixing, and compacting 600 Mpa in pressure for 10 minutes in holding time, and sintering at 300, 500, 700°C for 0,5; 1; and 1,5 hours in holding time. Then, measure the sinter density and analyze the sample by XRD and SEM-EDX. Based on experiment, we found that the bullet Cu-10%wt which sintering 500 °C in temperature for 1 hour has the best frangibility. The highest theoretical density , compression strength, and hardness are 8.8 gr/cm3, 280.45 MPa, 60.67 HRF. The observer result by scanning electron microscope showed that the phase homogeneity at sintering temperature 500°C for 1 hour in holding times was better than the other variable. By observing phase formed, in XRD pattern show that identified new phase Cu_(10)Sn_3 caused the material properties fragile.