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Metal powder rolling

Metal powder processing where the powder is mechanically compressed into a strip which is then sintered into a solid sheet.

Beskrivning
Illustration of Metal powder rolling

The process

A hopper [1] adds metal powder continuously to a pair of rolls [2] which mechanically compresses the powder to a green body in the form of a strip. To then achieve metallurgical bonding, the strip passes a furnace [3] to be sintered by diffusion between the atoms. Often the sheet is rolled once more [4] after sintering to give better properties, it’s then cooled [5] and wound into a coil.

The sintered body may then undergo various methods to further improve its properties. Some of the most common secondary operations are Carburization, infiltration, restamping, surface compression and impregnation.

Metal powder rolling
Advantages and disadvantages
In comparison with alternative methods
High mechanical strength
Very low porosity
No crystallographic orientation
Reusable scrap
Compatible for continuous processing
Free from defects such as lamination
Ends of the strip formed are fragile
The density of the product may vary
Rolls of larger diameter required for thinner strips