• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Materials Engineering and Performance >The preparation of TiAl-based intermetallics from elemental powders through a two-step pressureless sintering process
【24h】

The preparation of TiAl-based intermetallics from elemental powders through a two-step pressureless sintering process

机译：通过两步无压烧结法从元素粉末制备TiAl基金属间化合物

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

Pressureless sintering is not considered feasible for the preparation of TIAI-based intermetallics from elemental powders due to the Kirkendall effect. When the compacts are sintered without pressure, swelling and surface cracking occur in thebillets; Porous billets are obtained, which cannot be further used. Nevertheless, pressureless sintering is still worth investigating because of lower cost and easier operation. In this study, a two-step pressureless sintering process was developed toprepare the TiAl-based intermetallic preforms. The first step was to eliminate the aluminum particles in the billets through a solid-state sintering procedure to prevent the aluminum from melting and to suppress the formation of the Kirkendall pores bysintering with a constrained mold. The second step was to make the billets homogenized and densified by a high-temperature sintering procedure. Results show that the billets sintered with constrained molds are dense and crack free after the first step.Then, the billets are densified in the second step. Therefore, the application of constrained molds makes pressureless sintering feasible in the preparation of the TiAl-based intermetallics from the elemental powders. The microstructure is fullytransformed from the aluminum and titanium compacts to the TIAI-based intermetallics after this two-step pressureless sintering process.
机译：由于柯肯达尔效应，从元素粉末制备基于TIAI的金属间化合物认为无压烧结是不可行的。当压坯在没有压力的情况下烧结时，坯料中会发生膨胀和表面开裂。获得多孔坯料，无法进一步使用。尽管如此，由于较低的成本和更容易的操作，无压烧结仍然值得研究。在这项研究中，开发了两步无压烧结工艺，以替代基于TiAl的金属间预成型坯。第一步是通过固态烧结程序消除坯料中的铝颗粒，以防止铝熔融并通过约束模具烧结来抑制Kirkendall孔的形成。第二步是通过高温烧结程序使坯料均质化和致密化。结果表明，第一步烧结后的坯料致密且无裂纹，然后第二步进行了致密化处理。因此，约束模具的应用使得无压烧结在由元素粉末制备TiAl基金属间化合物中成为可行。经过两步无压烧结工艺后，微观结构从铝和钛压坯完全转变为基于TIAI的金属间化合物。

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