制备工艺对等离子炬阴极使用寿命影响的研究

• 作 者: 雷刚 都淑丽 王雨勃 何旭初 杨金华
• 机 构: 烟台龙源电力技术股份有限公司,
• 出 处: 热加工工艺
• 发表日期: 2014年03期
• 关键词: 阴极 等离子炬阴极 真空熔铸 夹杂物 真空 晶粒粗大 光学显微镜 塑性变形 金属熔体 成形工艺

研究了采用熔化-塑性变形-机械加工的传统工艺和真空熔铸近终成形新工艺制备等离子炬阴极,用光学显微镜观察了两种工艺制备的阴极微观组织,发现采用传统工艺制备的阴极内部存在空隙、晶粒粗大且含有夹杂物;采用新工艺制备的的阴极内部致密、晶粒细小且无夹杂物。而这些组织特征正是等离子炬阴极所必须的,并且此工艺简单,节省原材料。采用新工艺制备的阴极使用寿命较传统工艺制备的阴极有大幅度提高。

The cathode of plasma torch was fabricated by the traditional melting-plastic deformation-machining process and the vacuum fusion casting near-final forming process. The cathode microstructure of the two processes was observed by light microscopy. The cathode internal structure Voids, coarse grains and inclusions; the cathode prepared by the new process is dense, with fine grains and no inclusions. These organizational features are exactly what the plasma torch cathode must do, and this process is simple and saves raw materials. The cathodes prepared by the new process have a greatly improved service life compared with the cathodes prepared by the traditional process.