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Technology Stocks : 3D Printing
DDD 29.83+1.8%Jun 11 4:00 PM EDT

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From: The Ox5/18/2020 11:44:26 AM
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Bursting your (tiny) bubbles: new research points the way toward pore-free 3-D printing

by Andre Salles, Argonne National Laboratory

What this research team found surprised even them. In a paper published in Nature Communications, the group described the three forces acting upon pores within the melt pool: buoyancy, which should force the gas up and out of the melt area; melt flow drag, which should swirl the gas around within the molten pool; and thermocapillary force, which drives the pores to move along the temperature gradient.

Of these three forces, they discovered that the thermocapillary force in certain area of the molten pool exerts the most influence over where the pores ended up. The drag created by the melting liquid metal is second, which means that the natural tendency of these gas pockets to move upward and out of the melt area was countered.
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