Microstructure and mechanical properties of ZrCW matrix composite prepared by reactive infiltration at 1300 °C

Fully dense ZrCW matrix composite was fabricated by reactive infiltration technique, where molten Zr2Cu alloy infiltrated into a porous WC preform at 1300 °C in vacuum. The ZrCW composite exhibits a core-shell structure feature: gray WC cores were enveloped by bright tungsten shells, which are homogeneously distributed in the ZrC matrix. X-ray diffraction and transmission electron microscopy investigation show that nano-sized ZrxCuyCz particles were formed in the ZrC matrix. The Vicker's hardness, flexural strength and fracture toughness of the ZrCW composite are measured as 14.5 GPa, 615 MPa and 11.7 MPa m1/2, respectively.

► Dense ZrCW matrix composite was fabricated by pressureless reactive infiltration at 1300 °C.
► ZrCW composite exhibits a core-shell structure with nano-sized yCz inside the ZrC matrix.
► The Vicker's hardness, flexural strength and a fracture toughness of the composite are measured.