Mixing / blending of metal powders

Blending : Mixing powder of the same chemical composition but different sizes

Mixing : Combining powders of different chemistries

The above figure (a) shows the container in which the powder to be mixed is added

· The blade continuously rotates and mixes the powder.

· Figure (b) shows a rotating drum in which powder is filled and the drum keeps on rotating and simultaneously mixing the powders.

· Wet or dry mixing is generally employed.

· For wet mixing water or dry solvent is used to obtain better mixing.

· Blending and mixing is necessary for

· Addition of lubricants coats the powders and reduces die wear and lowers pressure required for pressing of powders.

· Mixing powders of different materials

· Obtaining uniform distribution of particle sizes.