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Elliott, Amy M.
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article
Processing of complex-shaped collimators made via binder jet additive manufacturing of B4C and pressureless melt infiltration of Al
Abstract
Complex collimator geometries are necessary for custom neutron scattering applications. Boron carbide (B<sub>4</sub>C) is an appropriate candidate collimator material because its high boron content results in a large neutron-absorbing cross section and it can be safely processed with powders and subsequent melt infiltrations. High-density collimator geometries of boron carbide-aluminum metal matrix composites were fabricated using binder jet additive manufacturing followed by pressureless melt infiltration with Al alloys. Infiltration of three different Al alloys was demonstrated and the effects of processing time on one alloy were analyzed. During processing, additional reactant phases were produced, and the resulting microstructure was analyzed. Collimator samples produced had high densities and hardness as well as favorable neutron scattering results.