Preparation and Arc Breakdown Behavior of Nanocrystalline W-Cu Electrical Contact Materials

材料科学技术（英）, 2005, 21(6): 875-878.

^1, , ^2, , ^3,

1.School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China;Department of Materials Physics, Xi'an Jiaotong University, Xi'an 710049, China

2.Department of Materials Physics, Xi'an Jiaotong University, Xi'an 710049, China

3.Department of Materials Physics, Xi'an Jiaotong University, Xi'an 710049, China

基金项目: 中国科学院资助项目(50071043) the Nat-ural Science Fundation of Shaanxi province under(2004E105)

Preparation and Arc Breakdown Behavior of Nanocrystalline W-Cu Electrical Contact Materials

Keywords： Nanostructured materials

Nanostructured (NS) W-Cu composite powder was prepared by mechanical alloying (MA), and nanostructured bulk of W-Cu contact material was fabricated by hot pressed sintering in an electrical vacuum furnace. The microstructure,electric conductivity, hardness, breakdown voltage and arcing time of NS W-Cu alloys were measured and compared to conventional W-Cu alloys prepared by powder metallurgy. The results show that microstructural refinement and uniformity can improve the breakdown behavior, the electric arc stability and the arc extinction ability of nanostructured W-Cu contacts materials. Also, the nanostructured W-Cu contact material shows the characteristic of spreading electric arcs, which is of benefit to electric arc erosion.

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Preparation and Arc Breakdown Behavior of Nanocrystalline W-Cu Electrical Contact Materials

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