Hard alloy and preparation method and application thereof

The invention discloses a hard alloy as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a hard phase, a binding phase and Cr3C2, carrying out wet grinding, carrying out pressure casting to form a pressed blank, dewaxing and sintering to obtain the hard alloy. The hard alloy is prepared by controlling the relative density of the pressed blank, the hardness and the bending strength of the prepared hard alloy can meet the use requirements under the high-temperature working condition, the production cost and the production time of the alloy are greatly reduced, the process control is simple, and industrial production can be realized.