Microstructure and Wear Resistance of the Ni/ZrO2 Composite Casting-Infiltration Layer on ZG45 Catt Steel Surface

Ni/ZrO2 composite casting-infiltration layer on ZG45 steel surface was prepared by negative pressure technology. The microstructure, hardness and tribology property at room-temperature of composite casting-infiltration layer were studied. The results show that the main phases of the composite casting-infiltration layer were ZrO2, Cr2B, NiB, and Fe(Ni). The surface hardness of composite casting-infiltration layer couldreach 60-64HRC, and the microhardness presented change of gradient from the surface of casting-infiltration layer to substrate. The zone with maximum value was the subsurface of casting-infiltration layer and the maximum value was 8.5 GPa. The wear rate of the substrate under the load of 100 N and 250 N were 22.6 and 21.9 times of casting-infiltration layer respectively.