Abstract

In this paper, mono-layered and functionally graded composites (FGCs) of W, Zr and Cu were prepared through powder metallurgy. Zirconium was used to investigate the possible improvement in arc erosion properties and the underlying mechanisms. The weight loss and the surface morphology of composites were analyzed after 30 vacuum arc discharges. The results showed that the weight loss due to arc erosion was decreased by adding Zr to the functionally graded composite. Compared with mono-layered composites without any additives, the surface morphology of four-layered FGCs containing zirconium and high amounts of Cu particles in the successive layers, showed a homogeneous erosion behavior and the heat concentration and erosion of the surface contacts had been prevented to a great extent. Moreover, due to the higher melting point of Zr than Cu and its smaller work function compared to W and Cu, a substantial part of the arc power was consumed by zirconium leading to a significant reduction of the slight splash of molten copper and the W/Cu contacts.

Graphic Abstract

摘要

本文通过粉末冶金制备了W，Zr和Cu的单层功能梯度复合材料（FGC）。锆用于研究电弧侵蚀性能和潜在机理的可能改善。30次真空电弧放电后，分析了复合材料的重量损失和表面形态。结果表明，通过在功能梯度复合材料中添加Zr可以减少因电弧腐蚀引起的重量损失。与不含任何添加剂的单层复合材料相比，连续层中含有锆和大量Cu颗粒的四层FGC的表面形态显示出均一的腐蚀行为，并且防止了表面接触的热集中和腐蚀。在很大程度上。此外，

图形摘要