Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第19卷    第4期    总第121期    2009年4月

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文章编号:1004-0609(2009)04-0682-07
小孔径泡沫铝的制备及孔结构细化机理
左孝青1,A. R. Keenedy2,毕业顺1,陆建生1,周  芸1,孙加林1

(1. 昆明理工大学 材料与冶金工程学院,昆明 650093;
(2. Advanced Materials Group, School of M3, University of Nottingham, Nottingham NG7 2RD, UK
)

摘 要: 在常规熔体发泡法的基础上,采用加入0.5%(质量分数)Mg、添加1%形核剂和发泡剂,经(400 ℃, 6 h)+( 475 ℃, 1 h)氧化预处理、搅拌发泡50 s等措施,制备出平均孔径1.03 mm、孔隙率75%、结构均匀的小孔径Al-9Si泡沫。孔径细化机理分析表明,Mg的作用在于降低铝熔体的表面张力,提高气泡稳定性;形核剂的作用在于增加气泡非均匀形核的核心;发泡剂氧化预处理可以推迟和延缓发泡剂的分解,提高发泡剂的分散均匀性;搅拌发泡的作用是在发泡剂剧烈分解的中段,通过搅拌搅碎气泡,减小平均孔径。

 

关键词: 泡沫铝;小孔径;制备;机理

Fabricating and cell structure refining mechanism of
aluminum foam with fine cell structure
ZUO Xiao-qing1, A. R. Kennedy2, BI Ye-shun1, LU Jian-sheng1, ZHOU Yun1, SUN Jia-lin1

1. Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technology,
Kunming 650093, China;
2. Advanced Materials Group, School of M3, University of Nottingham, Nottingham NG7 2RD, UK

Abstract: Based on the general melt foaming processing, Al-9Si foam with cell diameter of 1.03 mm, porosity of 75% and uniform cell structure was fabricated through adding alloying element 0.5%(mass fraction)Mg, adding 1% nuclear forming agent and pre-heating foaming agent by (400 ℃, 6 h)+( 475 ℃, 1 h), stirring when foaming for 50 s. The cell structure refining mechanism shows that adding Mg decreases the surface tension of the aluminum alloy melt and hence to increase the bubble stabilization. Adding nuclear forming agent increases the nuclei of heterogeneous nucleation. Adding pre-heating foaming agent postpones its decomposition, hence to increase the uniform of foaming agent dispersion. Stirring within the middle stage of foaming agent rapid decomposition breaks up big bobbles to fine bobbles, hence to reduce mean cell diameter.

 

Key words: aluminum foam; fine cell diameter; fabricating; mechanism

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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