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The authors have examined the fabrication conditions of SiC composites containing carbon nanofiber, i.e., vapor-grown carbon nanofiber (VGCF), to enhance the fracture toughness. Commercially available ultrafine SiC powder (specific surface area: 47.5 m2 g−1) was mixed with VGCF and sintering aid in the Al4C3–B4C system. Approximately 1.5 g of the mixture was uniaxially pressed at 50 MPa to obtain...