Composite tungsten carbide hard alloy bar and preparation methods thereof

The invention provides a composite tungsten carbide hard alloy bar. The composite tungsten carbide hard alloy bar is particularly made of Ir-WC-NdFeCo or Nb-WC-NdFeCo, and can also be made of Ir-TiC-NdFeCo or Nb-TiC-NdFeCo generated thereby. The composite tungsten carbide hard alloy is prepared from WC or TiC powder, Co powder, Nb or Ir powder and Nd2Fe14B powder. The invention also discloses four preparation methods of the composite tungsten carbide hard alloy bar, namely a ball milling method, an extrusion molding method, a cold isostatic pressing method and a compression molding method. By the adoption of the four preparation methods, the obtained composite tungsten carbide hard alloy is high in hardness, fracture toughness and compressive strength, and the composite tungsten carbide hard alloy bar belongs to novel hard alloy bars and can realize industrial production.