Page 149 - Module DMV20173

8.0 POWDER PROCESSING

8.2.1 METHODS OF POWDER PRODUCTION

1. There are several methods of producing metal powders, and most of them can be
produced by more than one method.

2. The choice depends on the requirements of the end product.

3. The microstructure, bulk and surface properties, chemical purity, porosity, shape and

size distribution of the particles depend on the particular process used.
4. These characteristics are important because they significantly affect the flow and

permeability during compaction and in subsequent sintering operations.

5. Particle sizes produced range from0.1 to1000 μm.
6. Example methods of producing metal powders are:

 atomization;
 reduction;
 electrolytic deposition;
 carbonyls;

 comminution;
 mechanical alloying;

 miscellaneous methods;
 nanopowders;
 microencapsulated powders.

Figure 8.3 Metal powders.

BPLK 181 DMV 20173