• CN:11-2187/TH
  • ISSN:0577-6686

›› 2011, Vol. 47 ›› Issue (6): 73-79.

• 论文 • 上一篇    下一篇

气室体积和吹气口数量对泡沫铝孔径的影响

刘兴男;李言祥;陈祥;范雪柳   

  1. 清华大学机械工程系;教育部先进成形制造重点实验室
  • 发布日期:2011-03-20

Effect of Gas Chamber Volume and Number of Orifices on Pore Size in Gas Injection Foaming Process

LIU Xingnan;LI Yanxiang;CHEN Xiang;FAN Xueliu   

  1. Deparcment of Mechanical Engineering, Tsinghua University Key Laboratory for Advanced Materials Processing Technology (Ministry of Education)
  • Published:2011-03-20

摘要: 研究吹气法制备泡沫铝工艺中静态吹气装置的气室体积和吹气口数量对泡沫铝孔径的影响。归纳关于气室体积对产生气泡大小的影响,以及在中小流量下气泡大小的计算公式。结合吹气法制备泡沫铝工艺,使用可以调节气室体积的供气系统,发现减小吹气装置的气室体积可以有效减小泡沫铝孔径。根据试验数据提出适合吹气发泡工艺的修正系数,使其能够计算吹气法泡沫铝的孔径。研究发现对于相同气室体积的吹气装置,增加吹气孔数时泡沫铝的孔径减小。据此提出“有效气室体积”的概念,认为吹气头的表观气室体积除以有效吹气孔数才是发挥作用的有效气室体积。利用“有效气室体积”和孔径计算修正系数能够较好地预测泡沫铝的孔径。

关键词: 吹气法, 泡沫铝, 气泡生成, 气室体积

Abstract: The influence of the gas chamber volume and the number of orifices of gas injection device on pore size of aluminum foams in the gas injection foaming process are studied. The effect of the gas chamber volume on bubble size and the formula for calculating the bubble size under low and intermediate gas flow rate are summarized. It is found that with the decreasing of the gas chamber volume the pore size of the aluminum foams decreases apparently by using a chamber adjustable gas supplying system. Based on the experimental data, suitable correction factors for calculating the pore size of the aluminum foams in the gas injection foaming process are presented. The experimental results also show that the aluminum foams with small pores can be fabricated by the gas injection device with more orifices when the gas chamber volume keeps a constant. To explain this phenomenon, the conception of “effective gas chamber volume” is proposed, which is defined as the quotient of the apparent volume divided by the number of the effective orifices. The values calculated with the effective gas chamber volume and the correction factors presented in this paper agree with the experimental data.

Key words: Aluminum foam, Bubble formation, Gas chamber volume, Gas injection

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