摘要
采用孔径可以调节的开孔聚氨酯海绵作为模板,将熔模铸造法与渗流铸造法相结合,制备了具有三维网状骨架的高孔隙率(ε=92%～98%)海绵铝;分析了海绵铝骨架所遵循的拓扑规律,并描述了其孔结构.结果表明,对聚氨酯海绵骨架进行加粗处理,可以在ε=92%～98%范围内调节海绵铝的孔隙率,并提高其压缩屈服强度.海绵铝独立孔穴的面数f、棱数e和顶点数v遵循Euler定律f-e+v=2;孔穴的平均棱数n与平均面数f符合关系n=6(1-2/f).
Al sponge samples with high porosity (Ε=92%-98%) were made by investment casting and infiltration casting techniques. Reticulated polyurethane sponges with open cells and low relative density were used as templates. The pore structure of Al sponge was described and the main structure parameters were obtained. The results show that the ligaments of Al sponge can be modified and its compressive yield strength is improved accordingly. The removal of mould material is simplified by using soluble plaster mould. Fluid flow resistance and capillary pressure are the main resistances in the course of infiltration casting. The cellular structure obeys topological rules. The number of vertices, v, edges, e, faces, f for an isolated cell are related by Euler' law f-e+v=2. The average number of edges per face n¯ is related to the average number of faces per cell f¯ by n¯=6(1-2/f¯).
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2005年第6期34-38,共5页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金重大
重点项目(90205005
50231010)
国家973计划项目(2006CB601200)
关键词
海绵铝
高孔隙率
熔模铸造
渗流铸造
Aluminum
Investment casting
Metal casting
Polyurethanes
Porosity
Topology
Yield stress
