Additive manufacturing of boron carbide via continuous filament direct ink writing of aqueous ceramic suspensions. Issue 14 (November 2016)

• Record Type: Journal Article
• Authors: Costakis, William J.; Rueschhoff, Lisa M.; Diaz-Cano, Andres I.; Youngblood, Jeffrey P.; Trice, Rodney W.
• Is Part Of: Journal of the European Ceramic Society. Volume 36:Issue 14(2016:)
• Page Start: 3249
• Page End: 3256
• Publication Date: 2016-11
• Subjects: Boron carbide -- Additive manufacturing -- Direct ink writing -- Aqueous ceramic processing -- Rheology; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2016.06.002
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Direct ink writing, a type of additive manufacturing, has been used to fabricate near-net shaped boron carbide (B4 C) specimens at room temperature with aqueous suspensions. Suspensions with B4 C 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.% B4 C 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 B4 C solids loading. Optimal specimens with high filament layer shape retention and no warpage were produced with suspensions containing 54 vol.% B4 C and 25k g/mol PEI.