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Updated: Jan 2, 2026

Negative Additive Manufacturing of Complex Shaped Boron Carbides
Published on: September 18, 2018
The Heat of Formation of Boron Carbide
1Institute for Basic Standards, National Bureau of Standards, Washington, D.C. 20234.
Abstract:
The standard heat of combustion in fluorine of a boron carbide sample having the composition B4.222C was determined from the heats of combustion of polytetrarluoroethylene and of boron carbide-polytetrafluoroethylene mixtures. The energy of the combustion reaction was measured in an isothermal-jacket bomb calorimeter. From the experimental data, we calculate -17.1 kcal mol-1 for the heat of formation of boron carbide. By combining all probable errors, we estimate our overall experimental uncertainty to be 2.7 kcal mol-1. The value for the heat of formation of boron carbide is for the phase represented by the formula B4.222C.
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