Effect of Sintering Process on Microstructure and Properties of Nanocrystalline Binderless Cemented Carbides
Nanocrystalline binderless cemented carbides were prepared by traditional powder metallurgy process through vacuum high-temperature sintering and vacuum pre-sintering+hot isostatic pressing.The effects of sintering temperature and sintering pressure on the microstructure and mechanical properties of the cemented carbides were studied by Vickers hardness tester,scanning electron microscope,and wet grinding wheel wear tester.The results show that increasing the sintering temperature leads to abnormal grain growth in the cemented carbides,and increasing the sintering pressure results in a high-density and uniform microstructure.The nanocrystalline binderless cemented carbide prepared by vacuum pre-sintering+hot isostatic pressing has excellent mechanical properties.The hardness is 29.01 GPa;the fracture toughness is 8.2 MPa·m1/2,and the abrasive wear value is 0.06 cm3/(105·r).
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