Preparation of a porous magnetic filter for O₂ gas concentration

Abstract

We produced porous ceramics for gas separation using membrane formation of Nd₂Fe₁₄B powders on alumina (Al₂O₃) support. The average pore size and porosity of the alumina support were, respectively about 67 mm and 34–40%. Selectivity of this support was about 1.07, which well agreed with Knudsen diffusion. The coated Nd₂Fe₁₄B membrane thickness was about 166 µm. The sample selectivity after membrane formation was 1.07. Gas selectivity properties were not developed. When magnetized on the same sample, gas selectivity appeared at low differential pressure at gas permeation. Samples with a lower gas flow rate of the alumina support exhibited higher selectivity. The maximum was 1.22.