熔体发泡法制备泡沫铝过程中无泡层的形成与控制.pdf.pdf

文档介绍：第 18 卷第 7 期中国有色金属学报 2008 年 7 月
The Chinese Journal of Nonferrous Metals Jul. 2008
文章编号:1004-0609(2008)07-1268-06

熔体发泡法制备泡沫铝过程中无泡层的形成与控制

李兵,曹卓坤,王永,姚广春,华中胜

(东北大学教育部材料先进制备技术工程研究中心,沈阳 110004)

摘要:对熔体发泡法制备泡沫铝过程中无泡层的形成与控制进行研究,考察熔体中加入金属镁后的表面张力以
及镁的加入对无泡层厚度的影响,结果表明:泡沫铝制备过程中无泡层的形成分为 3 个阶段,第一阶段为发泡初
期短时间内形成,在这个过程中,气泡向上运动,部分液体残留在底部形成无泡层;第二阶段和第三阶段为气泡
长大过程,由于液膜液体与 Plateau 边界处处存在压力差,促使液膜处的液体流向 Plateau 边界处,最后通过 Plateau
通道流向底部形成无泡层;向加入 3%Ca(质量分数)的纯铝熔体中再加入 %Mg 后,熔体的表面张力显著降低,
泡沫体中无泡层的厚度得到很好的控制。
关键词:泡沫铝;熔体发泡法;无泡层;黏度;表面张力
中图分类号:TG 文献标识码:A

Formation and control of bubble-free layer during preparation of
Al foam by foaming in melt

LI Bing, CAO Zhuo-kun, WANG Yong, YAO Guang-chun, HUA Zhong-sheng

(Key Laboratory of Ministry of Education for Advanced Preparing Technique of Materials,
Northeastern University, Shenyang 110004, China)

Abstract: The formation and control of bubble-free layer in Al foam block during the preparation was investigated, the
surface tension of melt Mg was viewed, and the effect of Mg on the thickness of bubble-free layer was studied. The
results show that there exist three processes for the formation of bubble-free layer. The first process is the initial stages of
foaming, in this process, bubbles move upwards, and a portion of liquid remains at the bottom and es bubble-free
lay