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›› 2006, Vol. 6 ›› Issue (6): 973-977.

• 材料工程专栏 • 上一篇    下一篇

轧制复合-粉末冶金发泡工艺制备泡沫铝夹心板

祖国胤,张敏,姚广春,李红斌   

  1. 东北大学材料与冶金学院
  • 出版日期:2006-12-20 发布日期:2006-12-20

Preparing Aluminum Foam Sandwich by the Roll-bonding-powder Metallurgy Foaming Technique

ZU Guo-yin,ZHANG Min,YAO Guang-chun,LI Hong-bin   

  1. School of Materials & Metallurgy, Northeastern University
  • Online:2006-12-20 Published:2006-12-20

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摘要： 针对目前泡沫铝夹心板制备工艺中存在的主要问题，将轧制复合技术应用于可发泡复合板的制备，以获得更高的芯层粉末致密度与界面结合强度. 研究结果表明，预压成型后的芯层粉体通过轧制过程能够同钢面板实现牢固的初结合，轧后芯层粉末的致密度明显高于热压复合板，粉末颗粒间呈紧密的层片状结构，为发泡过程创造了有利条件. 综合考虑界面结合强度、芯层粉末致密度及轧制缺陷等因素，轧制压下率应控制在60%~70%为宜. 复合板在适宜的发泡工艺下可以获得理想的泡沫体结构，最佳发泡温度为620~640℃，发泡时间为8~10 min. 发泡后在界面上生成了厚度均约为10 μm的金属间化合物FeAl3及Fe/Al固溶体，无脆性金属间化合物Fe2Al5生成，界面形成了理想的冶金结合.

关键词: 泡沫铝夹心板, 轧制复合, 粉末冶金发泡, 压下率, 扩散

Abstract: The technique of roll-bonding was applied to prepare the foaming composite board in order to settle the main problem that exists in the preparation of aluminum foam sandwich in this work. The result shows that the preformed core powder cake can strongly integrate with the steel sheet after rolling. The tightness of rolled core powder is obviously higher than that of hot pressing composite board and the powder takes on the closely stratified structure, which creates the favorable condition for foaming. Considering integrated the factor such as bond strength, tightness of core powder and rolling defect, the best deformation rate should be controlled at 60%~70%. The composite board can obtain the perfect foam structure under proper foaming technological conditions: the best foaming temperature is 620~640℃ and foaming time 8~10 min. Intermetallic compound of FeAl3 and Fe/Al solid solution with about 10 mm thickness occur at the interface after foaming. Thus the interface leads to the perfect metallurgical bonding.

Key words: aluminum foam sandwich, roll-bonding, powder metallurgy foaming, deformation rate, diffusion