复合稀土钨电极研究

测试了几种稀土钨电极的焊接性能,并对其组织结构进行了分析,深入探讨了稀土在不同电极中的作用机理。发现高温下稀土相形状将发生改变,毛细管现象只在电极开始工作时存在。由于传输速率和蒸发速率不同,铈钨电极头部出现贫稀土,侧面形成环状富集;1:2:1镧铈钇电极侧表面富稀土;1:1:3镧铈钇电极表面出现融熔;稀土通过融熔的钨传输到表面;从而保持电极的形状不变和电弧的稳定。

A Study on the Properties of Rare Earth Doped Tungsten Materials

In this paper,the performance of several tungsten electrodes mixed with rare earth oxides are tested,their microstructure are studied subsequently, the roles of rare earth oxides are discussed. It also indicates that the shape of the oxides changes in high temperature and the capillary driven phenomena only acts initially. Because the ratio between oxides migration and vaporization are difference,the surface of W_CeO2 electrode will be short of rare earth oxides. The surface of electrode mixed with 1:2:1 La_Ce_Y oxides will enrich oxide,the surface of electrode mixed with 1:1:3 La_Ce_Y oxides will melt. The oxides migrate to surface through the molten tungsten,therefore the electrode shape,as well as the arc remains stable.