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Gradualism in sintered porous materials obtained by powders sedimentation

I. VIDA-SIMITI1,* , N. JUMATE1, V. MOLDOVAN1, G. THALMAIER1, N. SECHEL1

Affiliation

  1. Department of Materials Science and Technology, Technical University of Cluj-Napoca, 103-105 Muncii Ave., 400641Cluj-Napoca, Romania

Abstract

Gravitational sedimentation of metallic and ceramic powders is a way of obtaining porous sintered materials with porosity gradient, materials with high functional performance especially in microfiltration. For this studies spherical nickel powders (size range 1-65 µm) was used. The sedimented and dried samples were sintered in vacuum at 950°C and 1000°C, for 10 and 20 min. The porous structures were investigated by scanning electron microscopy and mercury porosimetry. The sintering should be conducted in such a way that particles in the top layers (small particles) and the bottom layers (coarser particles) shouldn’t be under or over sintered..

Keywords

Powder sedimentation, Porous material, Porosity gradient..

Submitted at: June 14, 2011
Accepted at: Sept. 15, 2011

Citation

I. VIDA-SIMITI, N. JUMATE, V. MOLDOVAN, G. THALMAIER, N. SECHEL, Gradualism in sintered porous materials obtained by powders sedimentation, Journal of Optoelectronics and Advanced Materials Vol. 13, Iss. 9, pp. 1189-1192 (2011)