Elastic modulus and flexural strength were measured at room temperature for solid pieces hot‐pressed at 1900 to 2600 K from mixtures of B 4 C powder and ≤15 wt% B powder. Regression analysis showed that elastic modulus and flexural strength are not significantly affected by these boron additions. Elastic modulus is related to porosity and flexural strength to porosity and grain size. The fracture surface energy of boron carbide was evaluated. X‐ray diffraction and chemical analyses showed that the specimens were composed entirely of boron carbide after hot‐pressing. Lattice constants increased with the initial boron content.
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Champagne et al. (1979) studied this question.