Fabrication of a Porous Metal via Selective Phase Dissolution in Al-Cu Alloys

Abstract

Through free corrosion, a new low cost porous material was successfully fabricated by removing a single phase of a binary aluminum-copper alloy. This selective phase dissolution was carried out an Al-Al 2 Cu eutectic alloy of the Al-Cu binary system and additionally for two hypereutectic compositions. The porosity of the material depends on the microstructure formed upon solidification. For this reason, several solidification methods were studied to define the most convenient in terms of uniformity and refinement of the average pore and ligament sizes. The samples were corroded in a 10% v/v NaOH aqueous solution, which demonstrated to be the most convenient in terms of time involved and resulting porosity conditions after the corrosion process. The porosity was measured through analysis of secondary electron images. The effectiveness of the process was verified using X-ray diffraction, which showed that, under the proposed methodology, there was complete removal of one of the phases, namely the aluminum one.

Nanoporous Metals: From Plasmonic Properties to Applications in Enhanced Spectroscopy and Photocatalysis

“…This is true with a thin film or a nanostructure of Al or Mg, and it is even more important in the typical dealloying processes to prepare NPMs. For this reason, very few examples of NPMs made of Al and Mg have been reported so far. ,,− ,− Al and Mg are discussed here together because they have been used in combination or as the starting alloy in order to obtain NPMs. In particular, Corsi et al achieved a nanoporous Al structure starting from Al–Mg parent alloys made by melting pre-Al and pure Mg at 750 °C.…”

Synthesis, Characterization and Applications of Sustainable Advanced Nanomaterials

“…Besides Au and Ag nanoparticles, aluminum has also been widely studied as a UV plasmonic material. In most cases, the preparation of suitable Al structures required several processing steps, ranging from chemical synthesis of Al nanoparticles to nanolithography for nanostructured films [93,94]. Garoli and co-workers have described the fabrication of nanoporous aluminum structures from Al 2 Mg 3 alloy by means of a galvanic exchange reaction [95].…”

Nano-mousses métalliques - Structure et élaboration

“…Pour un même alliage MnCu des taux de porosité très variables et des tailles de ligaments de 16 nm à 125 nm sont obtenus suivant que la dissolution naturelle est effectuée en milieu HCl, H2SO4, acide citrique, ou par dissolution électrochimique [23]. Le lecteur trouvera plusieurs exemples de nano-mousses de Au, Pd, Pt, Ag, Cu [14], de dissolution à partir de l'eutectique Al-Al4cu [24], à partir d'alliage multiphasés AgCuSi [25].…”