以CaCO3为发泡剂, 加入基体质量1.0%~3.0%的镁, 在不使用增黏剂的情况下采用熔体发泡法制备出了孔结构均匀、孔隙率在62.4%~84.0%的泡沫铝, 研究了镁的添加对铝熔体发泡效果的影响, 最后考察了泡沫铝的压缩性能。结果表明: 在铝熔体中添加适量的镁有利于形成孔结构均匀的泡沫铝, CaCO3与熔体发生产气反应后, 产生的金属氧化物颗粒对铝熔体有增黏作用, 可以提高熔体黏度, 并可以存在于胞壁中, 有利于小孔径胞孔的形成; 但泡沫铝胞壁中存在的大量微孔会导致泡沫铝压缩性能降低。

Without any thickening agent addition, Al foams with porosity ranging from 62.4% to 83.3% and fine cell size were fabricated successfully via melt-foaming method by using CaCO3 as foaming agent and the addition of 1.0wt%-3.0wt% Mg in Al matrix. The effect of addition of Mg on the foaming ability of Al melt and the compressive property of Al foams were studied. The results indicate that the moderate addition of Mg in the Al melt was beneficial to form Al foam with fine cell size. Gas release reaction of CaCO3 in the Al melt produces solid oxide particles, which can thicken the melt effectively and lead to formation of small size pores. The pores with micrometer level size in the cell walls lead to a decrease of compressive strength of Al foam.