【摘要】 研究了真空感应熔炼 ( VIM)制备 Cu Cr2 5系触头材料 ,选择水冷凝固及加入 Ni- Al,W- Ni,W- Co二元添加剂得到的触头材料致密度高、氧含量低。讨论了合金元素与微观结构对物理性能与电击穿性能的影响 ,结果表明 ,适当的冷速、合理的添加元素能显著改善材料的显微组织、细化 Cr晶粒 ;W,Co还对 Cr相进行了有效的选择强化 ,合金的耐电压强度明显提高。更多还原

【Abstract】 The CuCr25 alloys with high density and low oxygen content were prepared by means of vacuum induction melting. The effects of alloying elements (Ni-Al,W-Ni,W-Co) and microstructure on the physical properties and dielectric strength were investigated.The experimental results show that the chromium grains are refined when appropriate solidifying method and alloying elements are selected.On the other hand, the tungsten and cobalt serve the function of strengthening chromium phase.As a result, the dielectric strength increases notably.更多还原