A LOW OXYGEN IRON POWDER AND METHOD FOR THE MANUFACTURING THEREOF

摘要

The invention concerns a novel low oxygen powder comprising particles of a base powder consisting of essentially pure iron having an insulating oxygen- and phosphorus-containing barrier. The oxygen content of the new powder is at most 0.2 % by weight higher than the oxygen content of the base powder, and the ratio O:P is between 30 and 1 , preferably between 15 and 2 and most preferably between and 3 as measured by the ESCA method. The invention also concerns a new meth od of preparing an iron-based powder comprising the steps of preparing a base powder consisting of a water atomised iron powder or a sponge iron powder, subjecting the mixture to treatment with a solution of phosphoric acid in an organic solvent and drying the obtained mixture, whereby the solution of phosphoric acid is sprayed on the base powder white being mixed.