Ag-GNPs新型电接触材料的制备及其电接触行为（英文）

Fabrication and Arc Erosion Behavior of Ag-GNPs as New Electrical Contact Materials

为阐明Ag-GNPs新型电接触材料的电弧侵蚀行为,采用粉末冶金技术制备了石墨烯纳米片质量分数为0.5%~2.0%的Ag-GNPs新型电接触材料,研究了Ag-GNPs材料的微观结构、密度、电导率,分析了材料电弧侵蚀后的质量损耗、表面形貌,探讨了材料的电弧侵蚀机制。实验结果表明,高含量的GNPs降低Ag-GNPs材料的密度和导电率,但可显著增加其力学性能。GNPs的密度与含量对熔池表面元素再分布有重要影响。高含量的GNPs更容易团聚和降低Ag-GNPs材料的电接触性能,特别是当Ag-GNPs材料中GNPs含量超过1.5%。GNPs含量为1.5%的Ag-GNPs电接触材料具有最佳的抗电弧侵蚀性能,DC 25/15A条件下电弧侵蚀后其质量损耗最低、侵蚀坑最浅。

In order to clarify the arc erosion behavior of Ag-GNPs as new electrical contact materials,Ag-GNPs with a different content of graphene nanoplate from 0.5%to 2.0%were prepared by powder metallurgy.The microstructure,density,and electrical conductivity were investigated in detail.The weight loss and surface morphologies of Ag-GNPs after arc erosion were characterized,and the arc erosion mechanism was discussed.The experimental results showed that high GNPs content lowered the densities and electrical conductivity of Ag-GNPs but significantly enhanced their mechanical performance.The density and content of GNPs played important role in the element redistribution on the molten pool of the Ag-GNPs.When GNPs content was high,they would gather on the surface and lead to a decline in the electrical contact performance of Ag-GNPs,and a serious decline was observed for Ag-GNPs with a GNPs content of more than 1.5%.However such Ag-GNPs presented the best anti-arc erosion performance,as evidenced by the lowest weight loss and shallowest arc erosion pits after arc erosion under DC 25V/15A.