铝合金熔体泡沫化过程中粘度的变化  

Change of the viscosity in the foamed process of Al alloy melt

作　　者：戴戈[1] 何德坪[2] 尚金堂[1] 

机构地区：[1]东南大学 [2]东南大学材料科学与工程系,教授南京市210096

出　　处：《材料研究学报》2005年第1期35-41,共7页Chinese Journal of Materials Research

基　　金：国家自然科学基金重点;重大和面上No.50231010;No50471031;No.50081002;No.19982001资助项目~~

摘　　要：用新型旋转扭矩探测仪对铝合金熔体增粘过程中的粘度进行了实时检测和控制,研究了熔体粘度的变化规律以及粘度对孔结构的影响规律.结果表明,在铝合金的增粘过程中粘度的变化与生长曲线类似;熔体的粘度过高使胞孔小、数量多;而粘度过低则相反.铝合金熔体泡沫化过程的最佳粘度值为27-28 mN·m,可以获得孔结构高度均匀、高比强的泡沫铝合金.A new type of torque meter was successfully used to measure the viscosity of Al alloy in the foaming process. The real time measurement and control of the viscosity were achieved in the preparation process of Al and Al alloy, revealing the rule of viscosity change as well as the influence on pore structure. The viscosity change with time is similar to the growth curve. The greater viscosity value decreases the pore diameters and increases the number, while less viscosity value is on the contrary. The optimized viscosity value in the foamed process of Al alloy is 27-28 mN&middotm in this experiment.

关 键 词：金属材料 熔体泡沫化 粘度 实时检测 高孔隙率泡沫铝合金 

分 类 号：TG146[一般工业技术—材料科学与工程]