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A Method for Measuring Powder Bed Density in Binder Jet Additive Manufacturing Process and the Powder Feedstock Characteristics Influencing the Powder Bed Density
Powder bed additive manufacturing involves layer-by-layer spreading of powders before
melting, sintering or binding them. Traditionally apparent and tapped density measurements have
been carried out to get an estimate of the powder bed density. Powder bed density is especially
important in the case of binder-jet additive manufacturing where sintering is carried out as one of
the steps to achieve full densification. During densification, shrinkage occurs. The extent of
shrinkage depends upon the powder bed density. Thus, it is important to understand the role of
powder feedstock on controlling the powder bed density. In the present paper, we have
developed a technique to measure the powder bed density. We also used different powder
feedstock materials to understand the role of powder size distribution and morphology on the
powder bed density. The detailed results are presented.Mechanical Engineerin