Hoganas Ab

Other

Patricia Jansson

Björn Skårman

Zhou Ye

Jan R Tengzelius

Lars-&angst;ke Larsson

Sten-Ake Kvist

Magdalena Nillius

A process for the manufacture of soft magnetic composite components is provided including the steps of: die compacting a powder composition including a mixture of soft magnetic, iron or iron-based powder, core particles of which are surrounded by an electrically insulating, inorganic coating, and an organic lubricant in an amount of 0.05 to 1.5% by weight of the composition, the organic lubricant being free from metal and having a temperature of vaporization less than the decomposition temperature of the coating; ejecting the compacted body from the die; heating the compacted body in an inert atmosphere to a temperature above the vaporization temperature of the lubricant and below the decomposition temperature of the inorganic coating for removing the lubricant from the compacted body, and subjecting the body obtained after heating the compacted body in an inert atmosphere to heat treatment at a temperature between 300 and 600 in water vapor.

Soft magnetic composite materials

The invention concerns a process for the preparation of soft magnetic composite products comprising the steps of providing particles of an iron based soft magnetic material with an electrically insulating layer; optionally mixing the dry powder with a lubricant; compacting the powder and heating the obtained component at an elevated temperature in the presence of water vapour. The invention also comprises the iron powder compact subjected to this treatment.

Process for preparation of soft magnetic composites and the composites prepared

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 10 and 3 as measured by the ESCA method. The invention also concerns a new method of preparing an iron-based powder comprising the steps of preparing a base powder consisting of a water atomized 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 while being mixed.

Phosphate coated iron powder and method for the manufacturing thereof

Heat treating of magnetic iron powder

Iron powder components containing thermoplastic resin and method of

Powder-metallurgical composition having good soft magnetic properties

The aforementioned invention comprises an iron based powder mixture with up to 8% silicon, addition of which is in the form of ferrosilicon with a silicon content of approximately 50% and a particle size mainly less than 150 .mu.m.

Material for the powder metallurgical manufacture of soft magnetic

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Viken, Sweden

Patricia Jansson