Studies and Researches on the Obtaining of Sintered Gradual Porous Structures by Irregular Nickel Powders Sedimentation

Abstract:

The aim of this work is to obtain sintered porous membranes with graded structure for microfiltration by sedimentation and sintering of metallic powders. Our previous studies have demonstrated the possibility of obtaining sintered porous materials with graded structure by sedimentation. In this paper, irregular nickel particles were used having a grain size in the 2-90 µm range evaluated using scanning electron microscopy and laser scattering particle size analyzer. The powders were sedimented into a sintering die in a sedimentation medium consisting of water and dispersant agent. After drying, the samples were sintered at 1000°C for 10 minutes in vacuum (~1•10^-3 Pa). The structures obtained were characterized by scanning electron microscopy and mercury porosimetry. The pore size distribution was between 5-72 µm. The flow rate - pressure drop curves were experimentally determined and the viscous permeability coefficient was calculated using Darcy’s law (Ψv=0.14•10-12 m²). The absolute filtration fineness measured was 20 µm and the relative filtration fineness (95%) obtained for our membranes was 11 µm respectively. The possible applications for the studied membrane are: water microfiltration, environmental technologies, filtering lubricants and cleaning agents

• Periodical: Solid State Phenomena (Volume 188)
• Pages: 388-394
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.188.388
• Online since: May 2012
• Authors: Valentin Moldovan, Ioan Vida-Simiti, Nicolaie Jumate, György Thalmaier, Niculina Sechel, V. Petrescu

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