Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 36, Issue 14, Pages 3249-3256Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2016.06.002
Keywords
Boron carbide; Additive manufacturing; Direct ink writing; Aqueous ceramic processing; Rheology
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Funding
- U.S. Army Research Office [W911NF-13-0425]
- Undergraduate Research Apprenticeship Program (URAP)
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Direct ink writing, a type of additive manufacturing, has been used to fabricate near-net shaped boron carbide (B4C) specimens at room temperature with aqueous suspensions. Suspensions with B4C solids loading of 48-56 vol.% were dispersed with polyethlenimine (PEI, 25,000 and 750,000 g/mol) and exhibited yield-pseudoplastic behavior. Specimens with filament layer shape retention were produced with suspensions with 50-56 vol.% B4C and yield stresses >= 43 Pa and equilibrium storage moduli >= 700 Pa. No residual porosity or cracking between deposited layers was observed in any samples. However, warpage was observed in some green body specimens and was minimized through use of a low molecular weight polymer and reduction of the B4C solids loading. Optimal specimens with high filament layer shape retention and no warpage were produced with suspensions containing 54 vol.% B4C and 25kg/mol PEI. (C) 2016 Elsevier Ltd. All rights reserved.
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