Additive Manufacturing of WC-Ni Based Cemented Carbides via Vat Photopolymerization Technology
WC-Ni based cemented carbides were fabricated by vat photopolymerization(3D printing)tech-nology.The influence of slurry composition and printing parameters on the rheological and curing proper-ties of the slurry was investigated,as well as the properties of WC-Ni based cemented carbides.The results indicate that when the solid content of the slurry is 40 vol.％and ZN-1344 is chosen as the dispersant with an addition of 2％by mass of the powder,the rheological properties of the WC-Ni slurry meet the require-ments of the additive manufacturing process.And the viscosity of the slurry reaches 2.718 Pa·s at a shear rate of 100 s-1.When the printing parameters are set to 0.01 mm hatch spacing,90％laser power,and 2 000 mm/s scanning speed,the maximum single-layer curing depth of the slurry reaches 144 µm.The cal-culation model for the single-layer curing depth of the slurry is obtained by data fitting using the response surface methodology(RSM),and the calculated value has a deviation of 3.4％compared with the actual value,demonstrating its capability of theoretical prediction.The density and relative density of WC-15％Ni cemented carbide prepared via vat photopolymerization can reach a maximum of 13.51 g/cm3 and 96.5％,respectively.The addition of 1 wt.％grain growth inhibitor Cr3C2 significantly improves the Vickers hard-ness of the cemented carbide to 945 HV30,approaching the hardness of traditional cemented carbides with equivalent Ni content but without Cr3C2.
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