利用金属/气体共晶二维定向凝固的方法制备出放射状多孔金属. 凝固过程中, 气孔的 生成使熔体体积膨胀, 从而导致凝固界面前沿出现剧烈的熔体流动. Mg-H系实验结果显示, 横向对 流会影响气孔的生长方向, 促进气泡逸出以及降低气孔分布的均匀性. 通过合理的铸型结构设计以及 选择适当的工艺参数, 可以将剧烈而有害的横向对流限制至一个较低的程度, 从而制得高质量的气孔 均匀分布的放射状多孔镁.
By use of the bidirectional solidification process of metal-gas eutectic, at an atmosphere of high-pressure hydrogen or gas mixture of hydrogen and argon, a special type of porous material—porous metal with radial pore distribution, can be fabricated. During the solidification of metal-gas eutectic, the volume of the solidifying metal expands due to the evolution of gas pores. This volume expansion leads to a severe transverse convection in front of the solidification interface in the bidirectional solidification process. Experimental results show that during the solidification, the transverse convection in front of the solidifying interface will affect the growth direction of the gas pores, promote gas bubble escaping, and degrade the uniformity of gas pore distribution. By properly designing the structure of the casting mould and choosing appropriate processing parameters, the severe harmful transverse convection in front of the solidification interface can be depressed or limited to a lower level, and high quality radial-type porous magnesium with uniform pore distribution can be obtained.
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] | |
| [8] | |
| [9] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%