工艺参数对粉末烧结多孔铝孔隙特性的影响

Influence of process parameters on the pore characteristic of porous aluminum by powder sintered

采用粉末烧结法制备多孔铝,借助SEM及定量金相法研究了铝粉粒径、压制压力和添加剂含量等工艺参数对多孔铝的密度和孔隙率的影响规律.结果表明:随铝粉粒径、压制压力的减小或添加剂含量的增加,孔隙率增大,密度减小;孔隙多呈不规则的孔洞形貌,平均孔径为30～70μm;在铝粉粒径105～150μm、压制压力10～15kN、聚乙二醇含量为5%～10%及FB含量20%～25%的条件下,可烧结出孔隙分布均匀、孔径较均一且孔隙率较高的多孔铝.

<Abstrcat> Porous aluminum alloy specimens were prepared by powder sintering method in this paper. The effects of powder granularity, pressure and additives content on the density and porosity of porous aluminum were studied through SEM and quantitative metallographic method. The results show that the porosity increases and the density decreases with powder granularity decreasing or pressure decreasing or additive content increasing. The morphology presents an anomaly clearance pore with a mean pore diameter of 30-70 μm. Thus the aluminum with homogeneous pore distribution and pore diameter and high porosity is available under powder granularity of 105-150 μm, pressure of 10-15 kN, polyethylene glycol of 5%-10%, and FB content of 20%-25%.