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Tuesday, October 17 • 12:00pm - 1:20pm
3D Powder Bed Fusion “A Miniaturized Solids Processing Plant in a Box”

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Modern additive manufacturing systems based on powder bed technology integrate several well-established solids processing unit operations. Examples of relevant solids processing steps include mixing, fluidization, powder dosing, powder transport and storage, roller spreading, sintering and powder classification. Powder based systems can be viewed essentially as a miniaturized solids processing plant in a box. Though additive systems present their own unique set of challenges, established design principles are often overlooked. Solids processing plants often have poor efficiencies, long start-up times, and large sensitivities to feedstock material property variations, and powder bed fusion printers have not proven to be an exception.

This E&G Associates' presentation will focus on one of the essential foundations of solids processing, namely solids handling and storage. In particular, the problem of bin design will be presented as an introduction to the language and methodologies of solids processing and powder mechanics. Using well-established design principles, attendees will be shown that it is possible to design a storage system to prevent powder arching, ratholing, and segregation. Traditional characterization methods will be emphasized, including material property measurements of powder cohesion, powder/wall friction, and permeability, as well as related particle scale characterization of particle size, shape, and surface energy and hardness. Extensions as well as limitations of powder mechanics to related areas will be highlighted, namely roller spreading, fluidized and partially aerated flows. Lastly, the presentation will also touch upon some additional unit operations such as solids mixing and powder wetting.

Tuesday October 17, 2017 12:00pm - 1:20pm
BDC/INCubator

Attendees (18)




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