泡沫铝材的泡体演化过程

›› 2006, Vol. 6 ›› Issue (6): 978-982.

泡沫铝材的泡体演化过程

郭志强,姚广春,尉海军,李红斌

东北大学材料科学与冶金工程学院

出版日期:2006-12-20 发布日期:2006-12-20

Evolution of Pore Morphology in Foam Aluminium

GUO Zhi-qiang,YAO Guang-chun,YU Hai-jun,LI Hong-bin

School of Materials&Metallurgy, Northeastern University

Online:2006-12-20 Published:2006-12-20

摘要/Abstract

摘要： 采用冷压和冷压+热压两种压制方式进行了对比实验，研究了压制方式对粉末冶金法制备泡沫铝材料的影响. 通过对在680℃保温发泡制备的泡沫铝的研究，得出了Al-Si-Ca合金粉末制备的泡沫铝材料的泡体演化过程. 泡体经历了形核、长大、坍塌3个过程，泡体形状也经历了从圆形到多边形的转变，最终在重力和毛细作用力的驱动下，气泡壁熔体流动引起气泡合并粗化，泡体底部出现实铝层，泡体开始坍塌.

关键词: 粉末冶金, 泡沫铝, 压制方式, TiH2

Abstract: Two different kinds of pressing modes were applied in preparation of foam aluminium by powder metallurgy. It was found that the optimal structure of foam aluminium could be obtained by hot pressing mode. The evolution process of foam aluminium which was made by Al-Si-Ca alloy was studied at 680℃. It went through three stages: nucleation occurring in three different states, foam growth and collapse. The shape of foam also changed from round to polygon with the growth of foam. Finally the merging and porosity gradient of the foams which resulted from capillarity-driven and gravity-driven melt flowing within the melt foam column started, under the bottom of the foam, bubble-free layer appeared, the foam began to collapse.

Key words: powder metallurgy, foam aluminum, pressing mode, TiH2

郭志强;姚广春;尉海军;李红斌. 泡沫铝材的泡体演化过程[J]. , 2006, 6(6): 978-982.

GUO Zhi-qiang;YAO Guang-chun;YU Hai-jun;LI Hong-bin. Evolution of Pore Morphology in Foam Aluminium[J]. , 2006, 6(6): 978-982.

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