• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Key Engineering Materials >On the Sinterability of Commercial-Purity Niobium
【24h】

On the Sinterability of Commercial-Purity Niobium

机译：商业纯铌的烧结性

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

Niobium and niobium-base materials are currently used in several technological applications. High-vacuum sintering is a suitable technique to obtain commercial-purity niobium with a homogeneous fine-grained microstructure. High-vacuum sintering tests were carried out in the range 1000-2000deg.C using a fine niobium powder (dp ≈ 10 μm) in order to investigate the microstructural evolution. Sintering parameters such as density, linear shrinkage and porosity were evaluated. In addition to diffusion-controlled mass transport towards sintering necks, oxygen degassing also takes place due to the volatilization of niobium suboxides (NbO and NbO_2) depending on its initial content. At higher sintering temperatures, e.g. Ts > 1800deg.C, grain growth becomes the predominant mechanism and the pore-boundary interaction plays an important role during further densification. The higher mobility of high angle boundaries results in pore trapping inside the grains whereas sub-boundaries appear to be more susceptible to pore pinning because of their lower mobility.
机译：铌和铌基材料目前用于多种技术应用中。高真空烧结是一种获得具有均匀细晶粒组织的商业纯度铌的合适技术。为了研究显微组织的演变，使用细铌粉（dp≈10μm）在1000-2000℃的范围内进行了高真空烧结试验。评估了烧结参数，例如密度，线性收缩率和孔隙率。除了扩散控制的向着烧结颈的质量传输之外，由于铌的过氧化物（NbO和NbO_2）的挥发取决于其初始含量，因此也会发生氧气脱气。在较高的烧结温度下，例如Ts> 1800°C，晶粒长大成为主要机理，孔边界相互作用在进一步致密化过程中起着重要作用。高角度边界的较高迁移率会导致晶粒内部的孔隙俘获，而子边界由于其较低的迁移率而似乎更容易受到孔隙钉扎的影响。

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