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Abstract
The effect of a phosphorus addition to iron powder for production of soft magnetic materials is investigated. The phase diagrams calculated by ThermoCalc1 and experiments show the beneficial effect of the phosphorus addition especially when sintering in a carburising atmosphere. The carbon uptake is greatly reduced and is explained by the presence of ferrite in the material during sintering. The phosphorus addition also reduces the magnetic aging both in samples sintered in a carbon containing atmosphere but also in a hydrogen atmosphere. No magnetic aging from precipitation of iron phosphide is seen.
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