Hoganas Ab

H&ouml;gan&auml;s Ab

Paul Skoglund

Hilmar Vidarsson

Mikhail Kejzelman

Sven Allroth

Per Knutsson

Ermin Imamovic

Björn Skårman

Ola Andersson

Senad Dizdar

Anders Bergkvist

Bj&ouml;rn Johansson

Björn Skarman

Anders Bergmark

A specifically defined powder composition is provided wherein there is a requirement that the specified lubricant always be liquid at room temperature. Such powder composition contains coarse iron or iron-based powder having an average particle size between 75 and 300 &#x3bc;m wherein less than 10% of the powder particles have a size below 45 &#x3bc;m and the amount of particles above 212 &#x3bc;m is above 20%, and as a lubricant at least one non-drying oil or a vegetable or animal based fatty acid having a crystalline melting point below 25&#xb0; C., and a viscosity (&#x3b7;) at 40&#xb0; C. above 15 mPas, wherein said viscosity is temperature dependent according to the following formula:10 log &#x3b7;=wherein k is the slope, T is the temperature in degrees Kelvin, and C is a constant, in an amount between 0.04 and 0.4% by weight of the composition and optional additives. The slope preferably is above 800.

Coarse iron or iron-based powder composition containing specific lubricant

The invention concerns a method for producing products and coarse iron-based powder comprising a lubricant having a crystalline melting point below 25&#xb0; C., a viscosity (&#x3b7;) at 40&#xb0; C. above 15 mPas and wherein said viscosity is temperature dependent according to the following formula: 10 log &#x3b7;=k/T+C wherein the slope k is preferably above 800, T is temperature in Kelvin and C is a constant, in an amount between 0.05 and 0.4%.

Method for making compacted products and iron-based powder comprising lubricant

The invention concerns a powder metallurgical composition containing, preferably a coarse, soft magnetic iron or iron-based powder, wherein the particles are surrounded by an insulating inorganic coating and as lubricant at least one non-drying oil or liquid having a crystalline melting point below 25&#xb0; C., a viscosity (&#x3b7;) at 40&#xb0; C. above 15 mPas and wherein said viscosity is temperature dependent according to the following formula:10 log &#x3b7;=wherein the slope k is above 800

Lubricants for insulated soft magnetic iron-based powder compositions

The invention concerns a powder composition including an iron or iron based powder and a lubricating amount of an alkylalkoxy or polyetheralkoxy silane, wherein the alkyl or polyether group has between 8 and 30 carbon atoms and the alkoxy group includes 1-3 carbon atoms.

Iron-based powder

The present invention concerns a process for the preparation of high density green compacts comprising the steps of providing an iron-based powder essentially free from fine particles; optionally mixing said powder with graphite and other additives; uniaxially compacting the powder in a die at a compaction pressure of at least about 800 MPa and ejecting the green body. The invention also concerns the powder used in the method.

Method of preparing iron-based components

A powder metal tooth part and a method of producing a toothed sintered metal part by uniaxially compacting an iron or iron-based powder having coarse particles in a single compaction step, subjecting the part to sintering, and subjecting the part to a surface densifying process.

Sintered metal parts and method for the manufacturing thereof

The invention concerns a sintered metal part which has a densified surface and sintered density of at least 7.35 g/cmand a core structure distinguished by a pore structure obtained by single pressing to at least 7.35 g/cmand single sintering of a mixture of a coarse iron or iron-based powder and optional additives.

The invention concerns a method of preparing products having a sintered density of above 7.3 g/cm. This method comprises the steps of subjecting a water-atomised, stainless steel powder to HVC compaction with an uniaxial pressure movement with a ram speed of at least 2 m/s, and sintering the green body.

High density stainless steel products and method for the preparation thereof

The invention concerns a powder composition including an iron or iron based powder and a lubricating amount of an alkylalkoxy or polyetheralkoxy silane, wherein the alkyl or polyether group has between 8 and 30 carbon atoms and the alkoxi group includes 1-3 carbon atoms.

The present invention concerns a new ferromagnetic powder composition comprising soft magnetic iron-based core particles wherein the surface of the core particles are surrounded by an insulating inorganic coating, and a lubricating amount of a compound selected from the group consisting of silanes, titanates, aluminates, zirconates, or mixtures thereof. The invention also concerns a process for the preparation of soft magnetic composite materials using the new powder composition.

A powder box, an arrangement for a powder box comprising an insert and a method for filling powder into a cavity formed in a die. Gas is supplied to a powder box, which is movable toward and away from a position just above the cavity. The gas is supplied through a permeable plate, which is arranged on at least one insert and which faces the interior of the powder box, so that particles of the powder in the powder box are movable relative to each other. The fluidisation of the powder shortens the filling time and results in an even particle size distribution in the cavity.

Powder filling method and arrangement therefor

The present invention concerns a method of preparing PM products by high velocity compaction of iron or iron-based powers having irregular powder particles.

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Höganäs, Sweden

Paul Skoglund