Magnetic Properties of Sintered Compacts of Iron Powders with and without Phosphorus Addition

Abstract

Specimens of sintered iron were prepared by the double-pressing method, using eight kinds of commercial iron powder, and their D.C. magnetic properties were measured. The sintered electrolytic iron powder named “Merisinter” possessed high density and excellent magnetic properties. It was noticed that the flux density depended essentially on the sintered density, while the maximum permeability varied widely according to the purity of powders.
Sintered compacts made by the single-pressing method using iron powder with addition of phosphorus, possessed high density owing to the shrinkage during sintering, especially when fine electrolytic iron powder was used. In this case, too, the flux density of compact depended on its specific gravity.
A sintered iron made from single-pressed Höganäs iron powder MH 300 with addition of 0.7%P had a magnetizing characteristic comparable to that of sintered MH 100 powder, without phosphorus addition, prepared by double-pressing.