小孔径泡沫铝的制备及压缩性能研究

稀有金属材料与工程, 2009, 38(z3): 254-259.

小孔径泡沫铝的制备及压缩性能研究

左孝青 ^1, , ^2, , 王永胜 ^3, , 毕于顺 ^4, , 陆建生 ^5, , 周芸 ^6,

1.昆明理工大学,云南,昆明,650093

2.Advanced Materials Group, School of M3, University of Nottingham, University Park, Nottingham NG7 2RD, U K

3.昆明理工大学,云南,昆明,650093

4.昆明理工大学,云南,昆明,650093

5.昆明理工大学,云南,昆明,650093

6.昆明理工大学,云南,昆明,650093

基金项目: 云南省人才培养项目(2006PY01-06) 云南省国际合作项目(2006GH21) 国家自然科学基金(50461003)

关键词：泡沫铝 , 小孔径 , 制备 , 压缩性能

Fabrication and Compressive Properties of Al foam With Fine Cell Structure

Zuo Xiaoqing ^1, , Kennedy A R ^2, , Wang Yongsheng ^3, , Bi Yushun ^4, , Lu Jiansheng ^5, , Zhou Yun ^6,

1.昆明理工大学,云南,昆明,650093

2.Advanced Materials Group, School of M3, University of Nottingham, University Park, Nottingham NG7 2RD, U K

3.昆明理工大学,云南,昆明,650093

4.昆明理工大学,云南,昆明,650093

5.昆明理工大学,云南,昆明,650093

6.昆明理工大学,云南,昆明,650093

Keywords： Al foam , fine cell diameter , fabrication , compressive property

在常规熔体发泡法基础上,采用添加0.5%Mg(质量分数,下同)以降低表面张力;发泡剂400 ℃,6 h+500℃,1 h氧化预处理以协调发泡剂分散均匀性与发泡过程关系;发泡搅拌60s以破碎初始气泡等措施,成功制备出了平均孔径1.3 mm、孔隙率70.5%、结构均匀的小孔径泡沫铝.泡沫铝及Al-9Si泡沫的压缩性能分析表明,随平均孔径减小,泡沫铝的屈服强度、致密化应变和能量吸收能力均明显提高,泡沫铝压缩性能随孔径减小而提高,与泡沫铝的孔结构因素及孔结构均匀性有关.

Based on the general melt foaming processing, small-size Al form with 1.3 mm average cell diameter, 70.5% porosity and uniform cell structure was fabricated by other measures including adding alloying element 0.5% Mg(mass fraction, similarly hereinafter) to decrease Al melt surface tension, pre-heating forming agent TiH2 by 400 ℃, 6 h+500 ℃, 1 h to harmonize the relationship between forming agent dispersion and decomposition at the stage of forming processing and foaming stirring for 60 s to break the initial bubbles. The compressive property tests of fabricated Al foams and Al-9Si foams suggest that with the decrease of the average cell diameter, two kinds of foam's yield strength, densification strain and energy absorption increase obviously. The reasons for these improvements are associated with the cell structure itself and the cell structure uniformity.

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