Effect of sintering temperature on microstructure and property of CuZnSn13 powder sintered body

The copper-zinc-tin alloys with 13% tin(mass fraction)are produced using atomized prealloyed powders of copper-zinc-tin and mechanically mixed elemental powders of copper,zinc and tin at different hot pressing temperatures,respectively.The microstructures of sintered bodies are analyzed using scanning electron microscopy and X-ray diffraction.The Rockwell hardness and bending strength are tested with hardness tester and universal testing machine.The relative density is tested in drainage method.The results show that the two sintered bodies have similar phase compositions under the same sintering condition.However,compared with that sintered using mixed elemental powder,the one sintered using pre-alloyed powder has more solid solution phases,a small amount of hard and brittle phases of Cu₆Sn₅ and Cu₆₁Zn₃₉ and much more homogeneous and finer microstructures.The density,Rock well hardness and bending strength of the two sintered bodies have a general uptrend with the increasing of sintering temperature,whereas the changes of the above properties of pre-alloyed powder sintered bodies are not obvious.