Scm Metal Products, Inc.

Scm Corporation

Mark Svilar

Erhard Klar

David F Berry

Stephen Glancy

The present invention relates to an infiltrated ferrous powder metal part containing certain additives, yielding a part having improved dimensional control during infiltration and uniform and predictable distribution of dynamic properties within a given group of commonly manufactured parts.

Infiltrated powder metal part and method for making same

The present invention relates to porous powder metal (P/M) parts having improved dynamic properties such as impact and fatigue strength. These properties are achieved by the use of finer metal powders.

Process for preparing powder metal parts with dynamic properties

The present invention relates to an infiltrated ferrous powder metal part containing certain additives, yielding a radically improved unnotched impact strength without sacrificing tensile strength. Fatigue strength is also improved. In addition, improved dimensional control is obtained during infiltration. The microstructure is also improved, with smoothing or rounding of the formerly sharp angled copper filled pores. The invention also comprises the method of achieving these results.

Infiltrated powder metal part having improved impact strength tensile

There is provided a process for infiltrating a compacted ferrous powder metal body with copper or a copper alloy which process is characterized by presintering the ferrous metal body at a temperature of from about 1875.degree. F. to a temperature below the melting point of the infiltrant, and then in the same furnace, raising the temperature above the melting point of the copper or copper alloy infiltrant for a period sufficient to infiltrate the powder metal body. This process is more economical than the prior double run infiltration processes and provides excellent impact strengths and tensile strengths.

Two-step infiltration in a single furnace run

A copper or copper alloy infiltrated ferrous powder metal part, and method for making the same, characterized as having after infiltration an overall density of at least 7.50 g/cm.sup.3 and a diffusion depth of copper into the steel matrix of less than about 4 micrometers as determined by chemical etching or less than about 8 micrometers as determined by electron dispersive X-ray analysis (EDXA), wherein said ferrous metal is plain carbon steel having a combined carbon content in the range of about 0.15% to about 1.25%, or a low alloy steel.

High impact strength power metal part and method for making same

A copper infiltrated ferrous powder metal part infiltrated with copper or a copper alloy characterized as having after infiltration a residual uninfiltrated porosity of less than about 7 volume percent and a maximum pore size of the residual uninfiltrated porosity of less than about 125 micrometers, said porosity and pore size values being taken from a worst field of view in a functionally critical area of said metal part.

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Orange, OH, United States of America

Mark Svilar