(東南大學(xué) 材料科學(xué)與工程系， 南京 210096)
摘 要: 采用負壓滲流鑄造法， 通過控制鋁熔體澆鑄量， 制備了高孔隙率（70%～90%）、 高通孔度（25%~50%）的多孔鋁； 研究了滲流驅(qū)動壓力、 鋁熔體澆鑄溫度及模具預(yù)熱溫度對滲流過程的影響；測試了多孔鋁的滲透系數(shù)， 并分析了孔結(jié)構(gòu)對滲透系數(shù)的影響。 結(jié)果表明： 通過正交實驗選擇滲流參數(shù)， 可以降低多孔鋁在滲流方向上的孔隙率梯度； 多孔鋁的滲透系數(shù)與其孔結(jié)構(gòu)密切相關(guān)：對于相同孔徑的多孔鋁, 滲透系數(shù)隨孔隙率增大而提高； 在孔隙率相同的條件下， 隨著孔徑增大， 表面積減小， 摩擦阻力減小，滲透系數(shù)相應(yīng)增大。
關(guān)鍵字: 多孔鋁； 高孔隙率； 滲流鑄造； 滲透系數(shù)
by infiltration method
（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
