Powder metallurgical body with compacted surface

Details Powder metallurgical body with compacted surface Powder metallurgical body with compacted surface

1998-12-10

2001-01-09

Jenkins, Daniel J. (Department: 1742)

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Consolidation of powder prior to sintering

C419S055000

Reexamination Certificate

active

06171546

ABSTRACT:

FIELD OF THE INVENTION
The present invention concerns compacted bodies and more particularly compacted and optionally presintered bodies, which are prepared from metal powders and which have a densified surface.
BACKGROUND OF THE INVENTION
Materials used for components subjected to a bending stress e.g. gear wheels are subjected to local stress concentrations, and it is preferred that these materials have superior properties at the local stress maximum regions.
An example of such a material is disclosed in EP 552 272 which concerns sintered powder metal blanks having densified surface regions. According to this publication the densified regions are obtained by rolling.
It is also known that the surfaces of sintered powder metallurgical parts can be densified by using shot peening. The purpose of shot peening the surfaces of these sintered parts is to induce compressive stress in the surfaces, which in turn results in sintered parts having improved fatigue strength, surface hardness etc.
SUMMARY OF THE INVENTION
It has now been found that important advantages can be obtained if the densification of the surface is performed before the sintering of the compacted parts. The most interesting results have been obtained when the compacted parts are subjected to the densification process after a presintering step. Accordingly, the present invention concerns a process for preparing compacted and preferably presintered bodies having a densified surface as well as the bodies obtained by this process.


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“Application of Uniaxial Pressure—Compression of Prismatic Compacts”,Treatise on Powder Metallurgy, Claus G. Goetzel, Ph.D., vol. I, Interscience Publishers, Inc., New York, 1949, pp. 316-318.
“Process Controls the Key to Reliability of Shot Peening”, J. Mogul et al.,Industrial Heating,No. 11 (Nov. 1995) pp. 34-35.

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