Abstract
Carbon nanofiber (CNF)‐dispersed B4C composites have been synthesized and consolidated directly from mixtures of elemental raw powders by pulsed electric current pressure sintering (1800°C/10 min/30 MPa). A 15 vol% CNF/B4C composite with ∼99% of dense homogeneous microstructures (∼0.40 μm grains) revealed excellent mechanical properties at room temperature and high temperatures: a high bending strength (σb) of ∼710 MPa, a Vickers hardness (Hv) of ∼36 GPa, a fracture toughness (KIC) of ∼7.9 MPa m1/2, and high‐temperature σb of 590 MPa at 1600°C in N2. Interfaces between the CNF and the B4C matrix were investigated using high‐resolution transmission electron microscopy, EDS, and electron energy‐loss spectroscopy.
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