泡沫铝熔体粘度的控制与气泡稳定性研究

Study on the Viscosity Control of Foam Aluminum Melt and the Bubble's Stability

对采用粉末冶金法制备泡沫铝材料进行研究.采用纯铝粉、纯铝粉中加入碳化硅颗粒、纯铝粉中加入粉煤灰颗粒、纯铝粉中加入碳纤维为原料,对泡沫铝的孔结构、熔体粘度及气泡的表面张力进行了研究,并对气泡的稳定性进行了探讨,分析了气泡的稳定机理.结果表明:加入碳纤维的泡沫铝的气孔均匀性最好.对泡沫铝的SEM照片分析表明,碳化硅颗粒、粉煤灰颗粒和碳纤维能够均匀地分布在泡沫铝的孔壁上,发泡过程中大量的颗粒分散在熔融或半熔的铝液中,增加了熔体的粘度,从而提高了气泡的稳定性.

This is a study on preparing foam aluminum by powder metallurgy. In this research the raw materials are pure aluminum powder, added carborundum, soot powder and carbon fiber. The microstructure of cell wall of foam aluminum, the viscosity and surface tension of melt are investigated. The bubble stabilities which are controlled through adding carborundum, soot powder and carbon fiber are discussed, and the mechanism of bubble＇s stability is analyzed. The results show that the homogeneity of bubble holes of foam aluminum is the best which is obtained by adding carborundum and carbon fiber into the raw materials. Observing SEM can indicate that carborundum particles and carbon fiber are distributed evenly on cell wall of foam aluminum. It means that during foaming a lot of particles are distributed diffusively in liquid aluminum melted or mid-melted. It increases the viscosity of melt so that the stability of bubble is increased.