A method called negative additive manufacturing is used to produce near fully dense complex shaped boron carbide parts of various length scales. This technique is possible via the formulation of a novel suspension involving resorcinol-formaldehyde as a unique gelling agent that leaves behind a homogenous carbon sintering aid after pyrolysis.
Lu, R., Miller, D. J., Du Frane, W. L., Chandrasekaran, S., Landingham, R. L., Worsley, M. A., Kuntz, J. D. Negative Additive Manufacturing of Complex Shaped Boron Carbides. J. Vis. Exp. (139), e58438, doi:10.3791/58438 (2018).