Hoganas Ab

H&ouml;gan&auml;s Ab

Sven Allroth

Paul Skoglund

Hilmar Vidarsson

Ola Bergman

Ermin Imamovic

Lars Hultman

Anders Bergkvist

Bj&ouml;rn Johansson

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 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

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

Spherical porous iron powder and method for producing the same

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

Sven Allroth