Grain Size Distribution. Grain size distribution is to a great extent the consequence of powder layer height. The growth conditions for the individual particles are different and depend on their position within the powder layer. The humidity is higher in the interior and decrease as one approaches the surface. This gradient results in large grain-sized particles inside and smaller grain-sized particles at the surface-neighboring areas. It is easy to understand that the distribution is broader for high powder layers and closer for lower layer. In any case, the distribution can be improved (made closer) by using “wet” hydrogen, since the water vapor gradient from inside to outside the layer will be decreased.
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