| 用金属/气体共晶二维定向凝固法制备放射状规则多孔Mg | |
| 王雪 ; 李言祥 ; 刘源 ; WANG Xue ; LI Yanxiang ; LIU Yuan | |
| 2010-06-08 ; 2010-06-08 | |
| 关键词 | Mg 多孔金属 共晶凝固 二维Gasar 放射状孔结构 Mg porous metal eutectic solidification 2D Gasar process radial pore structure TG111.4 |
| 其他题名 | FABRICATION OF REGULAR POROUS MAGNESIUM WITH RADIAL PORE DISTRIBUTION BY 2D GASAR PROCESS |
| 中文摘要 | 采用热传导方向为径向的金属-气体共晶二维定向凝固方法(二维Gasar),在纯氢和氢、氩混合气氛下制备了气孔沿径向规则分布的放射状多孔金属Mg．研究了放射状多孔金属结构的特点以及气体压力等工艺参数对孔隙率、孔径和气孔分布的影响．结果表明,在圆柱形试样的二维定向凝固过程中,金属-气体共晶形成的体积膨胀会在凝固前沿的液相中产生大的对流,影响气孔的生长方向和规则程度,同时还会导致气体的逸出．随混合气体中氩气分压的增大,逸出程度下降；当氩气分压大于氢气分压时,气体的逸出被完全抑止．由此可以准确地预测出放射状规则多孔金属的孔隙率．; By use of the 2D Gasar process (bidirectional solidification of metal-gas eutectic), with high-pressure hydrogen or gas mixture of hydrogen and argon introduced into the chamber, porous magnesium samples with radial pore distribution have been fabricated successfully through heat transferring in the radial direction.In addition,the structural features and the effects of gas pressure on porosity,pore size and distribution were studied.The results show that a larger convection will appear in the melt near the solidified front due to eutectic formation,and affect the growth of the gas pore and make gas escape.The escape rate reduces with argon pressure increasing.Gas will not escape when argon pressure is larger than hydrogen pressure.This model can be used to predict the porosity.; 国家重点基础研究发展规划项目2004CCA05100; 国家自然科学基金项目50404002资助 |
| 语种 | 中文 ; 中文 |
| 内容类型 | 期刊论文 |
| 源URL | [http://hdl.handle.net/123456789/48092]  |
| 专题 | 清华大学 |
| 推荐引用方式 GB/T 7714 | 王雪,李言祥,刘源,等. 用金属/气体共晶二维定向凝固法制备放射状规则多孔Mg[J],2010, 2010. |
| APA | 王雪,李言祥,刘源,WANG Xue,LI Yanxiang,&LIU Yuan.(2010).用金属/气体共晶二维定向凝固法制备放射状规则多孔Mg.. |
| MLA | 王雪,et al."用金属/气体共晶二维定向凝固法制备放射状规则多孔Mg".(2010). |
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