Toughened chromium carbide-based metal ceramic and preparation method thereof

The invention provides a strengthened and toughened chromium carbide-based metal ceramic and a preparation method thereof, and belongs to the technical field of hard materials. Cr2O3, TiO2, WO3 and carbon black are used as raw materials to be subjected to a carbon thermal reduction reaction, Ti and W atoms are subjected to solid solution in Cr3C2 crystal lattices in the carbon thermal reduction reaction, and therefore (Cr, Ti, W) 3C2 composite solid solution powder with single phase composition is obtained; then preparing chromium carbide-based metal ceramic with Ni powder and a forming agent; wherein the hard phase (Cr, Ti and W) 3C2 effectively reduces the dissolution and precipitation rate of Cr3C2 in the binding phase Ni, inhibits grain growth of the hard phase and eliminates pores, and meanwhile, due to the lattice distortion effect generated by the hard phase, the carbon sequestration capacity of a Cr3C2 matrix is enhanced, generation of a carbon-deficient phase is effectively inhibited, a positive effe