烧结温度对CuZnSn13粉末烧结体组织和性能的影响

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

分别选用CuZnSn13雾化预合金粉末和Cu、Zn、Sn单质机械混合粉末为原料,通过热压烧结法制备CuZnSn13合金,采用扫描电子显微镜、X射线衍射仪等手段对烧结组织进行分析,运用排水法、洛氏硬度计和万能试验机测试致密度、硬度和抗弯强度。结果表明:相同烧结条件下,两种烧结体主要组成相基本相同;但是,和单质机械混合粉烧结体相比,预合金粉烧结体中固溶相更多,并存在少量硬脆相Cu_6Sn_5和Cu_(61)Zn_(39)相,组织更加均匀细小;两种烧结体随烧结温度的升高,致密度、硬度和抗弯强度整体呈上升趋势,但预合金粉烧结体的性能随温度变化幅度不明显。

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 Cu61 Zna9 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