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研究了两步法制备泡沫镁合金的工艺,考察了发泡剂、增粘剂及Al加入量对泡沫镁合金结构的影响。结果表明,通过控制发泡剂、增粘剂及Al加入量,采用两步法工艺可以制备出结构均匀、孔隙率高的泡沫镁合金。发泡剂或增粘剂的加入量过高或过低时,泡沫镁合金中会出现无泡实体或较大气体空腔的缺陷。当合金熔体中不添加Al时,泡沫镁合金中普遍存在气孔大小不均匀的现象;加入2%～6%的Al后,合金熔体的倾倒流动性提高,泡沫镁合金的气孔大小基本均匀一致。随着发泡剂或增粘剂加入量的增加,泡沫镁合金的孔隙率先增大后减小,当发泡剂加入量为2%或增粘剂加入量为0.1%时,泡沫镁合金的孔隙率最大。随着熔体中Al加入量的增加,泡沫镁合金的孔隙率逐渐增大。
The process of two-step preparation of foamed magnesium alloy was studied. The effects of foaming agent, tackifier and Al addition on the structure of foamed magnesium alloy were investigated. The results show that the foamed magnesium alloy with uniform structure and high porosity can be prepared by controlling the foaming agent, tackifier and Al addition amount by two-step process. When foaming agent or tackifier is added too high or too low, foamed magnesium alloy will appear in the bubble-free solid or large gas cavity defects. When the alloy melt does not add Al, the bubble size of magnesium alloy is generally uneven phenomenon; adding 2% ~ 6% of Al, the alloy melt pouring mobility increased, the basic uniformity of the pore size of the foam magnesium alloy Consistent. With the increase of foaming agent or tackifier addition, the porosity of foamed magnesium alloy first increases and then decreases. When the amount of foaming agent added is 2% or the addition amount of tackifier is 0.1%, the porosity of foamed magnesium alloy Maximum porosity. With the increase of Al in the melt, the porosity of foamed magnesium alloy gradually increases.