AlymovSynthesis of a highly porous material based on mechanically alloyed Cu and Zn powders by chemical dealloying
In this work we obtained porous materials based on Cu - Zn alloy with high permeability and developed surface. This was achieved by creating multilevel porosity in the material by a combined method that combines the use of a removable pore former and chemical etching. The effect of synthesis conditions on the structure and properties of the obtained materials is investigated. The material structure is a system of interconnected pores with a size of 300 - 400 μm, as well as pores with a size of fewer than 15 μm. On samples subjected to chemical etching, an increase in the specific surface area was observed from 0.11 to 4.12 m2/g in the case when the pore-forming agent was ammonium bicarbonate, and from 0.88 to 1.60 m2/g - when the blowing agent was potassium carbonate. The multilevel porous material had a permeability of more than 12·10-12 m2 and a porosity of 83 - 87 %. It was found that the sintering of the material is accompanied by the evaporation and condensation of zinc on the surface of the pores.