Investigating the morphology, hardness, and porosity of copper filters
produced via Hydraulic Pressing
Ayub, Hasan, Khan, Lehar Asip, McCarthy, Eanna, Ahad, Inam UlORCID: 0000-0002-3802-6156, Fleischer, KarstenORCID: 0000-0002-7638-4480 and Brabazon, DermotORCID: 0000-0003-3214-6381
(2023)
Investigating the morphology, hardness, and porosity of copper filters
produced via Hydraulic Pressing.
Journal of Materials Research and Technology, 19
.
pp. 208-219.
ISSN 2238-7854
This paper presents an examination of the production of copper air filters via the Hydraulic Pressing (HP) method.
Processing conditions examined included powder particle type (spherical and dendritic), varying compaction
pressures (635, 714, and 793 MPa) and different pore forming (polyvinyl alcohol (PVA)) concentrations (1, 2, and 3
wt.%). Following compaction, the samples were thermally sintered in a two stage sintering regime at 200 ◦C and 750
◦C. The morphology, porosity, and mechanical properties of the sintered samples were characterised.
Morphological analysis demonstrated better consolidation and over-lapping of the copper powder particles in
samples with a higher weight percentage of the PVA. Highest porosity was achieved in the sample produced using
the dendritic copper powder mixed with highest weight percentage of PVA. As the samples were very porous, the
hardness of the samples varied greatly. Samples prepared with spherical powders at high pressure demonstrated
the highest hardness. The results in this study show that copper filters with 14%e26% porosity can effectively be
produced using spherical and dendritic copper powders by controlling the compaction pressure and PVA
concentration.