Agglomeration. The different between “as supplied” and “lab milled” (deagglomerated) particle sizes is measure of the degree of agglomeration. Agglomeration is very important for the strength of the green compacts and is therefore a necessary property for powder going into ductile tungsten production.
Much effort was expended in the past to elucidate the dependence of the compactability of tungsten powders on grain size and grain size distribution. Low grain sizes result in too low green densities due to high friction between the particles. The closer the grain size distribution, the poorer the particle packing. So it is evident that broader grain size distributions, or even blends of powders having different average grain sizes, result in better packing and higher strength of the green compacts.
Compaction and green strength is also influenced by the particle morphology. More irregular shapes, which cause interlocking, improve the strength.
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