Abstract The mixed powders of WC-6Co-GO/Al2O3 were prepared by mechanical ball milling method and ball milling-ultrasonic-freeze-drying method, respectively, and the bulk cemented carbide was prepared by cold press forming-sintering. The effects of the mixing process and the content of GO/Al2O3 composite particles on the dispersion of the mixed powders and the microscopic morphology, density and mechanical properties of the alloy were studied. The results show that ultrasonic freeze-drying can effectively solve the agglomeration problem of GO/Al2O3 composite particles and obtain fine uniform powder particles. In the prepared cemented carbide with the mass fraction of GO/Al2O3 composite particles of 0.15% when mixing powder by ball milling-ultrasonic- freeze-drying method, the composite particles are uniformly distributed among the WC grains to make the effect of refining the grains more significant, and the relative density of the alloy is higher, and the strength of the alloy increases to 2 723.6 MPa, which is about 600 MPa higher than that of the alloy with ordinary mechanical ball milling, and the hardness (HV30) and toughness also increase by about 200.0 and 1.0 MPa∙m1/2, respectively.
ZHANG Zhen,SU Wuli,SUN Lan. Effects of powder mixing process by ultrasonic freeze-drying method on the microstructure and properties of WC-6Co-Go/Al2O3 cemented carbide[J]. Materials Science and Engineering of Powder Metallurgy, 2023, 28(4): 338-346.
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