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采用化学共沉淀法合成了La_2Sn_2O_7/SnO_2复合粉体,并通过粉末冶金法制备了Ag-La_2Sn_2O_7/SnO_2电接触材料;研究了复合材料的抗电弧侵蚀性能,并对抗电弧侵蚀机理进行了探讨。结果表明:与Ag-SnO_2相比,Ag-La_2Sn_2O_7/SnO_2电接触材料经电弧作用后表面形貌较为平整,表现出较低的熔焊力。这可能是由于在电弧作用下La_2Sn_2O_7的存在有助于提高熔池的粘滞性,同时Ag-La_2Sn_2O_7/SnO_2触点表面分布的“小汗珠”状颗粒物能够起到分散电弧能量的作用,从而可以降低侵蚀区域的温升、减弱表面结构的破坏程度,获得较好的抗熔焊性能。Ag-La_2Sn_2O_7/SnO_2有望作为一种环保型电接触材料得到广泛应用。
The La 2 Sn 2 O 7 / SnO 2 composite powders were synthesized by chemical coprecipitation and the Ag-La 2 Sn 2 O 7 / SnO 2 electrical contact materials were prepared by powder metallurgy. The arc erosion resistance of the composites was studied and the mechanism of arc erosion was also discussed. The results show that compared with Ag-SnO 2, the surface morphology of Ag-La 2 Sn 2 O 7 / SnO 2 electrical contact material after arc is relatively flat and shows a lower welding power. This may be due to the fact that the presence of La 2 Sn 2 O 7 during arc can help to improve the viscosity of the weld pool and the small sweat particles distributed on the surface of Ag-La 2 Sn 2 O 7 / SnO 2 contact can disperse arc energy , Which can reduce the temperature rise in the erosion area, reduce the degree of damage to the surface structure, and obtain better anti-welding performance. Ag-La_2Sn_2O_7 / SnO_2 is expected to be widely used as an environmentally friendly electrical contact material.