Hybridized porous structure of Al alloy by surface modification of pores

Abstract

To improve the filtration efficiency of porous materials used in filters, an extensive specific surface area is required to serve as a site for adsorption with impurities. In this paper, a method for creating a hybridized porous alloy using a powder metallurgical technique to build primary pores in an Al-4 wt% Cu alloy and subsequent surface modification for a secondary pore surface with a considerably increased specific surface area is suggested. The specific surface area increased from 0.7 m(2)/g for the non-treated specimen to 7.3 m(2)/g for the 0.005 M NaOH-treated specimen. The surface-modified specimens showed a remarkable increase in micropores >10 nm. The primary pore structure was controlled by granulation, compacting pressure, and sintering; the secondary pore structure was obtained by a surface modification using a dilute NaOH solution.