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15卷    第8期    总第77期    2005年8月

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文章编号:1004-0609(2005)08-1248-05
渗流法制备高孔隙率多孔铝
张伟开, 李乃哲, 何德坪

(东南大学 材料科学与工程系, 南京 210096)

摘 要:  采用负压渗流铸造法, 通过控制铝熔体浇铸量, 制备了高孔隙率(70%~90%)、 高通孔度(25%~50%)的多孔铝; 研究了渗流驱动压力、 铝熔体浇铸温度及模具预热温度对渗流过程的影响;测试了多孔铝的渗透系数, 并分析了孔结构对渗透系数的影响。 结果表明: 通过正交实验选择渗流参数, 可以降低多孔铝在渗流方向上的孔隙率梯度; 多孔铝的渗透系数与其孔结构密切相关:对于相同孔径的多孔铝, 渗透系数随孔隙率增大而提高; 在孔隙率相同的条件下, 随着孔径增大, 表面积减小, 摩擦阻力减小,渗透系数相应增大。

 

关键词:  多孔铝; 高孔隙率; 渗流铸造; 渗透系数

Preparation of porous Al with high porosity
by infiltration method
ZHANG Wei-kai, LI Nai-zhe, HE De-ping

Department of Materials Science and Engineering, 
Southeast University, Nanjing 210096, China

Abstract: NPorous Al with high porosity (70%-90%) and high degree of pore-opening(25%-50%) was obtained by controlling the quantity of molten Al. The effects of infiltration pressure, casting temperature and preform particles temperature on the preparation process were analyzed. The infiltration property was studied through measuring the infiltration coefficient, which is significant to the application of porous Al. The results show that the main infiltration parameters can be selected by orthogonal test, which will modify the porosity gradient variation of porous Al. The infiltration coefficient of porous Al has close relevance to its pore structure. With the same pore size, infitration coefficient increases while its porosity increases. The specific surface declines with the increase of pore size, which results in the improvement of infitration coefficient.

 

Key words: porous Al; high porosity; infiltration casting;infiltration coefficient

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

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

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