Specific surface area. The specific surface area is an important criterion for the sintering activity ( solid state sintering), dissolution processes (liquid phase sintering), and reaction with gaseous or solid substances during carburization. Commonly, it is in the range of 0.01m2/g (coarse powders) up to 12m2/g (very fine powders).
Based on the specific surface area roughness of the particles. In particular, very fine powder particle do not exhibit “smooth” but “rough” surface, or even exhibit a certain degree of microporosity, hence increasing the specific surface area by factor of 2-4.
Apparent and tap density. Both densities increasing with increasing average grain size, but are additionally influenced by the grain size distribution, particle shape, and degree of agglomeration.
Compressibility. This is the ratio of green density to apparent density. The ratio increasing with increasing pressure until a limit is reached. Compressibility of a powder is an important criterion for press and die design.
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