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At physical and chemical methods there is a change of chemical composition
and properties of an initial material (chemical restoration of metals from oxides,
electrolysis of the melted salts, etc.).
Characteristics of the main technological properties of powders are:
- bulk weight - weight 1см ³ freely filled powder in grams. For production of
high-porous products (filters) we use powders with a small bulk weight, and for
the loaded details - with a big bulk weight.,
-fluidity - is the ability of powder to fill a form, in big degree influences
uniformity of form filling by the powder and consolidation speed when pressing.
- compressibility - is the ability of powder to be condensed under the influence
of external loading, it is characterized by durability of coupling of powder
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