Effect of CuO additives on the formation of SnO2-rich layers in Ag-SnO2 materials
Effect of CuO additives on the formation of SnO2-rich layers in Ag-SnO2 materials
复制标题
CuO添加剂对Ag-SnO2材料中富SnO2层形成的影响
DOI：
10.1016/j.jallcom.2018.08.159
复制
发表时间：
2019-01-05
影响因子：
6.2
通讯作者：
Chang, Yanli
中科院分区：
文献类型：
--
作者：
Wang, Jun;Zhao, Haidong;Chang, Yanli
为了研究CuO添加剂对Ag-SnO2触头材料富SnO层形成的影响，对Ag-SnO2触头材料进行了激光快速熔化实验，模拟电弧侵蚀过程中瞬时电弧熔化表层的快速熔化过程。使用扫描电子显微镜 (SEM) 研究了激光熔化和电弧腐蚀 Ag-SnO2 材料的微观结构。还利用两个处理凝固过程中颗粒-枝晶相互作用的模型对实验结果进行了理论分析。结果发现，添加CuO的Ag-SnO2材料在重熔区域没有发现富SnO2层，并且由于Ag基体和SnO 2 颗粒之间的拖曳力增加，SnO2颗粒仍然留在Ag基体中。随着拖曳力的增加，SnO2颗粒在S/L界面前的前进速度降低，SnO2颗粒在凝固过程中容易被Ag基体吞没，因此CuO掺杂的SnO2颗粒比纯SnO2颗粒更难被推出Ag基体。这些结果表明，CuO添加剂对Ag-SnO2触头材料中富SnO2层形成的影响增强了Ag熔池中SnO2颗粒的润湿性，抑制了SnO2颗粒向触头表面的上升。 (C) 2018 Elsevier B.V. 保留所有权利。
In order to investigate the effect of CuO additives on the formation of SnO2 -rich layer in Ag-SnO2 contact materials, the laser rapid melting experiment was carried out on Ag-SnO2 contact materials for the purpose of simulating the rapid melting process of an instantaneously arc melted surface layer during arc erosion. The microstructure of laser melted and arc eroded Ag-SnO2 materials were investigated using scanning electron microscopy (SEM). The experimental results were also theoretical analyzed with two models dealing with the particle-dendrite interaction during solidification process. It was found that the Ag-SnO2 materials with CuO additives have found no SnO2-rich layer in the re-melted area and the SnO2 particles still stayed in Ag matrix because of the increasement of dragging force between Ag matrix and Sn0 2 particle. As the dragging force increase, the advance speed of SnO2 particles in front of S/L interface was lowered and SnO2 particles were apt to be engulfed by Ag matrix during solidification, so the CuO doped SnO2 particles were more difficulty to be pushed out of the Ag matrix than pure SnO2 particles. These results indicated that the effect of CuO additives on the formation of SnO2-rich layer in Ag-SnO2 contact materials was enhanced the wettability of SnO2 particles in Ag melt pool and restrained the SnO2 particles rise to the contacts surface. (C) 2018 Elsevier B.V. All rights reserved.