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以化学Ag粉和纳米SnO_2为原料,用高能球磨法制备复合粉体并通过粉末冶金、热挤压、轧制等工艺获得Ag/SnO_2线材并对其进行退火处理。采用扫描电镜(SEM)和能谱仪、维氏硬度计、电桥以及电寿命试验机等对线材的电寿命测试前后的表面形貌、不同退火温度下的显微硬度和电学性能进行表征。结果表明,热挤压后,氧化物沿挤出方向呈条带状分布。随着退火温度从室温升高至920℃,线材电阻率由2.432μ?.cm降至2.202μ?.cm,HV维氏硬度由1.13GPa降至1.01GPa。920℃退火后,试验触头的燃弧时间、燃弧能量、接触电阻等较退火前明显升高,但表面形貌的变化以及熔焊力更小,烧蚀质量损失降低近60%,呈现出良好的抗电弧侵蚀能力。
Ag powder and nano-SnO_2 were used as raw materials to prepare Ag / SnO 2 wire by high-energy ball milling and annealed by powder metallurgy, hot extrusion and rolling. The surface morphology of the wire before and after the electrical life test, the microhardness and the electrical properties at different annealing temperatures were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy, Vickers hardness tester, electric bridge and electric life tester. The results show that, after hot extrusion, the oxide along the extrusion direction strip distribution. With the annealing temperature increasing from room temperature to 920 ℃, the wire resistivity decreased from 2.432μ? .cm to 2.202μ? .cm, HV Vickers hardness decreased from 1.13GPa to 1.01GPa. After annealing at 920 ℃, the arcing time, arc energy and contact resistance of the test contact were significantly higher than those before annealing, but the change of the surface topography and the welding power were smaller and the loss of ablation quality was reduced by nearly 60% Outstanding resistance to arc erosion.