用铝粉作增粘剂制备泡沫铝

采用熔体发泡法制备了孔结构均匀、孔隙率高的泡沫铝材料,系统研究了铝粉(增粘剂)含量、增粘搅拌时间、保温时间和发泡剂的含量对孔隙率和孔结构的影响。对铝粉在铝熔体中的增粘机理以及在发泡过程中对气泡的稳定作用进行了讨论。结果表明:加入质量分数5％铝粉,搅拌时间7 min,发泡剂TiH2质量分数1．5％,保温5 min的条件下,可以得到孔结构均匀、孔隙率约75％的泡沫铝硅合金材料。

Synthesis of Al Foams with Al Powder for Increasing Viscosity

Foamed aluminum with homogeneous structure and high porosity was prepared by using melt-foaming technique, and the influence of the concentration of aluminum powder, foaming agent, mixing time and foaming time on the porosity and pore structure was investigated. The foamed aluminum alloy (AlSi7Mg0. 45) with homogeneous structure and a porosity of about 75% was obtained under the following conditions: 5wt% aluminum powder, stirring time 7 min, 1. 5wt% TiH2, foaming time 5 min. The mechanism for increasing the viscosity of the melt aluminum and stabilizing the liquid foam by adding the aluminum powder is discussed.