TECHNOLOGY OF FORMATION OF MESOSTRUCTURES IN SINTERED WC-Co AND WC-Ni SOLID ALLOYS

For the first time, we demonstrate that the mesostructural WC-Co or WC-Ni hard alloy can be obtained as a result of ordinary liquid-phase sintering at temperatures from 1290 ? to 1370 ? and isothermal holding for 10-20 min. The hardness of alloys with mesostructure and a cobalt content decreasing from 28 to 20 wt.%, increases from 77.5 to 81 HRA, while the microhardness of mesoelements may increase from 4.76 to 6.3 GPa. The mesostructural WC-Co alloys are efficient in the production of mining tools for which it is necessary to guarantee high wear and impact resistance under alternating loads. At the same time, WC-Ni alloys are efficiently used in heavily loaded friction couples.