• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>High temperature materials and processes >Purification of Niobium by Electron Beam Melting
【24h】

Purification of Niobium by Electron Beam Melting

机译：电子束熔炼纯化铌

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Pure niobium metal, produced by alumino-thermic reduction of niobium oxide, contains various impurities which need to be reduced to acceptable levels to obtain aerospace grade purity. In the present work, an attempt has been made to refine niobium metals by electron beam drip melting technique to achieve purity confirming to the ASTM standard. Input power to the electron gun and melt rate were varied to observe their combined effect on extend of refining and loss of niobium. Electron beam (EB) melting is shown to reduce alkali metals, trace elements and interstitial impurities well below the specified limits. The reduction in the impurities during EB melting is attributed to evaporation and degassing due to the combined effect of high vacuum and high melt surface temperature. The % removal of interstitial impurities is essentially a function of melt rate and input power. As the melt rate decreases or input power increases, the impurity levels in the solidified niobium ingot decrease. The EB refining process is also accompanied by considerable amount of niobium loss, which is attributed to evaporation of pure niobium and niobium sub-oxide. Like other impurities, Nb loss increases with decreasing melt rate or increase in input power.
机译：通过铝热还原氧化铌生产的纯铌金属包含各种杂质，需要将其还原到可接受的水平才能获得航空级的纯度。在目前的工作中，已经尝试通过电子束滴熔技术来提纯铌金属，以达到确认ASTM标准的纯度。改变电子枪的输入功率和熔化速率，以观察它们对提纯和铌损失的综合作用。电子束（EB）熔化可将碱金属，痕量元素和间隙杂质还原到远低于规定的极限。由于高真空和高熔体表面温度的共同作用，EB熔化期间杂质的减少归因于蒸发和脱气。间隙杂质的去除百分比基本上是熔融速率和输入功率的函数。随着熔化速率的降低或输入功率的增加，凝固的铌锭中的杂质含量降低。 EB精炼过程还伴随着大量的铌损失，这归因于纯铌和次氧化铌的蒸发。像其他杂质一样，Nb的损失会随着熔化速率的降低或输入功率的增加而增加。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号