Abstract
The effects of doping with VC (grain growth inhibitors) on the microstructural characteristics and mechanical properties of WC-Al2O3 compacts prepared by hot-pressing sintering were investigated. VC suppressed the rate of densification during isothermal sintering, but eventually increased the sintered density with extended holding time. Microstructure observation results revealed that the grain growth of WC was significantly retarded with the addition of VC. Meanwhile, the activation energy for grain growth during isothermal sintering increased from 380.75 to 446.68 kJ/mol, which is consistent with the inhibition mechanism of VC.
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