Fused deposition modeling 3D printing of boron nitride composites for neutron radiation shielding

Fused deposition modeling (FDM) 3D printing is an additive manufacturing process capable of rapidly building three-dimensional computer-modeled objects. The technology offers an inexpensive and efficient technique to manufacture customized objects with intricate geometries using a simple printing process. However, FDM is currently restricted in application due to a limited availability of functional materials. Research in the field has focused on incorporating functional characteristics into printable polymers to expand application of FDM technology. In this work, neutron radiation shielding was targeted as an addition to FDM materials. By creating a composite material using a thermoplastic polymer matrix and boron nitride additive, neutron shielding of FDM-printed samples was enhanced from 50% attenuation in polymer specimens to 72% in composite specimens. The enhanced functionality of this new material enables FDM technology to be used in the manufacture of aerospace components, where neutron radiation presents a significant hazard.