温度对PCM法制备大尺寸泡沫铝的影响

在对静态PCM法制备泡沫铝的研究基础上,设计出动态制备大尺寸泡沫铝的实验装置,通过调整温度来控制预制体的发泡。研究了两种不同牵引速度（0.496 mm/s、0.687 mm/s）下预制体的发泡过程,研究发现：所得大尺寸泡沫铝孔结构质量（通过孔隙率、当量圆直径来衡量）随着发泡温度升高而提高,当温度超过800℃（v=0.496 mm/s）、820℃（v=0.687 mm/s）时,泡沫铝孔结构质量反而会下降。同时对其影响机理进行了分析。当牵引速度为0.496 mm/s时,发泡温度在780℃～800℃时,可以获得孔隙率在70%以上,孔径在2.75 mm左右,孔结构圆形度在0.68以上的大尺寸泡沫铝;当牵引速度为0.687 mm/s时,发泡温度在800℃～820℃时,可以获得孔隙率在65%～70%,孔径在2.5 mm左右,孔结构圆形度在0.67以上的大尺寸泡沫铝。

Influence of Temperature on Preparation of Large Aluminum Foam by PCM

A dynamic experimental device for the preparation of large aluminum foam was designed based on the static PCM method by adjusting the temperature to control the foaming behavior of the precursor.The results showed under two different drawing speed（0.496 mm/s,0.687 mm/s） the pore structure quality of large aluminum（porosity,equivalent circle diameter）increased with increasing foaming temperature,while when the temperature exceeds 800 ℃（v = 0.496 mm/s）,820 ℃（v=0.687mm/s）,the pore structure quality declines.When the drawing speed is 0.496 mm / s,at 780 ℃ to 800 ℃,the porosity more than 70%,pore size about 2.75 mm,the circularity more than 0.68.When the drawing speed is 0.687mm / s,at 800 ℃ - 820 ℃,the pore structure was obtained as porosity 65%-70%,pore size about 2.5mm,the circularity more than 0.67.