Fabrication of Magnetic Iron-Hercynite Composites by Reaction Sintering
Iron-hercynite composite was synthesized from Al and Fe3O4 powders by reaction sintering at ~1350oC, or by arc-melting. In reaction sintering, a three-step displacement reaction between Al and Fe3O4 was identified. In arc-melting, we observed that molten iron and hercynite segregated from each other readily. Magnetization of the extracted hercynite from the arc-melted sample was 4 emu/g, smaller than those previously reported, and this can be explained by the variations of the stoichiometric ratio and the degree of inversion of the spinel structure in the hercynite products.
J.K. Kim, D.Z. Wo, L.M. Zhou, H.T. Huang, K.T. Lau and M. Wang
K.C. Chung and D. H.L. Ng, "Fabrication of Magnetic Iron-Hercynite Composites by Reaction Sintering", Key Engineering Materials, Vols. 334-335, pp. 309-312, 2007