粉煤灰增粘制备泡沫铝的研究

熔体发泡法是在熔融金属中加发泡剂,搅拌均匀后加热使发泡剂分解产生气体,气体膨胀使金属液体发泡,冷却后即得泡沫固体。在研究中,采用添加氧化物颗粒即粉煤灰来增加熔体粘度。在XRD下观察,粉煤灰中还有大量石英和莫来石,是一种很好的硬质陶瓷颗粒。为了提高粉煤灰与铝的润湿性,采用铝硅合金并加入少量的钙来降低铝液表面张力,使粉煤灰加入更加容易。进行压缩检测发现,孔径接近的泡沫铝的能量吸收效果与密度成正比。

Study on Aluminum Foam with Fly Ash Increase Viscosity

Foam melting is to add foaming agent into melting metal, stirring and heating metal, the foaming agent decomposes at the melting temperature of aluminium, releases gas and blows up the melt. In this work, fly ash was selected as viscosity increaser in meltfoaming process. The most component are quartz and mullite which were observed by XRD in the fly ash, therefore it's a kind of hardness ceramic particles. In order to improve the wetting between fly ash and aluminium, we use a small quantity of Si and Ca to debase surface tension of aluminium, to make fly ash add into molten aluminium easier. Through compression strength test, the effect of energy absorption of aluminium foam with similar aperture is in direct proportion to its density.