Page 148 - Module DMV20173

8.0 POWDER PROCESSING

8.2 PRODUCTION OF METAL POWDERS

1. Powder processes is a forming and fabrication technique consisting of three major
processing stages.
2. First, the primary material is physically powdered, divided into many small individual

particles.
3. Next, the powder is injected into a mold or passed through a die to produce a weakly
cohesive structure (via cold welding) very near the dimensions of the object
ultimately to be manufactured.

4. Finally, the end part is formed by applying pressure, high temperature, long setting
times (during which self-welding occurs), or any combination thereof.
5. The powder metallurgy process consists of the following operations in sequence,
which involving the powder production, blending, compaction, sintering and finishing

operations.
6. Figure 8.2 shows the outline of processes and operations involved in making powder
metallurgy parts.

Pressing

Isostatic pressing
Atomization Rolling Atmosphere
Extrusion
Reduction
Electrolytic deposition
Carbonyls
Cold Sintering
compaction

Metal Blending Secondary
powders and finishing
Hot
compaction
Additive Coining
Lubricant
Isostatic pressing Forging

Machining
Heat treating
Impregnation

Figure 8.2 Outline of processes and operations involved in making powder metallurgy
parts.

BPLK 180 DMV 20173