凝胶注模成形法制备多孔铝及其性能研究

Preparation and performance of porous aluminum by gel-casting

为了开发多孔铝制备新工艺与提高性能,采用凝胶注模法制备了形状较复杂的多孔铝。探讨了固相含量和烧结温度对多孔铝的密度、孔隙率、显微结构及力学性能的影响。结果表明,随固相含量的增加,烧结体密度随之增大,抗压缩性能提高;在不添加烧结助剂的条件下,680℃为最佳烧结温度。制得的多孔铝为开孔结构,孔隙率在34%～53%间可调,平均孔径3.82μm,抗压强度76.8MPa,比表面积>0.12m2/g。

The porous aluminum with complex shape was prepared by gel-casting, in order to develop new preparation technology and improve performance of porous aluminum. The effects of the solid loading of concentrated suspension and sintering temperature on density, porosity, micro-structure and anti-compressive properties of porous aluminum were discussed. The results show that the density and anti-compression properties increased with rising solid loading of concentrated suspension. The optimum sintering temperature of porous aluminum were 680℃, without sintering aids. Porous aluminum products were obtained with open-cell, average pore diameter of 3. 82μm, compression strength of 76. 8MPa, specific surface area above 0. 12m2/g. And the controllable range of porosity was between 34%-53%.