| abstract |
WC-Co system having excellent abrasion resistance, toughness, fracture resistance and thermal crack resistance (WC-Co system in the present invention is not only composed of hard particles mainly composed of WC and iron group metal powder containing Co, but also hard particles) And at least one selected from carbides, nitrides, carbonitrides and borides except WC of the periodic table IVa, Va, and VIa elements. M 12 C-M 3 C-type complex carbide (M represents at least one of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, and at least one of Fe, Co, and Ni. ) Is subjected to carburization treatment on the WC-Co-based green compact formed as a main component of the surface layer portion, and then liquid phase sintering to adjust the surface layer WC average particle size with the liquid phase sintering temperature as an index. |