| مستخلص: |
Three-dimensional sand printing (3DSP) is widely applied in sand mold fabrication. In this study, the effects of printing parameters including the resolution of printehead holes, activator content, layer thickness, and recoating speed on the tensile and bending strengths, gas evolution, and loss-on-ignition (LOI) of 3DSP samples were investigated by changing single parameter, and the dimension deviation was also measured. As the resolution increases, the tensile strength, bending strength, gas evolution, LOI, and deviations at X- and Y-axis directions decrease gradually while the deviation at Z-axis direction firstly increases and then deceases. The gas evolution and LOI drops by 13.02% and 8.13% respectively, but the strength only reduces by 2.2% when the resolution increases from 0.08 mm to 0.09 mm. The strengths of samples rise at first and then decline while the gas evolution and LOI rise gradually with the increasing activator content or recoating speed. The activator content is found to have little effect on the gas evolution as the activator increases from 0.14% to 0.34%, the gas evolution is increased by 7.3% which is far less than the LOI increment of 24.1%. As the layer thickness increases, the tensile and bending strengths firstly rise and then drop while gas evolution and LOI descend. Under the optimal printing parameters of 0.09 mm resolution, 0.18% activator, 0.28 mm layer thickness and 160 mm⋅s-1 recoating speed, the tensile strengths for X-sample and Y-sample are 1.48 MPa and 1.37 MPa, the bending strengths are 1.84 MPa and 1.75 MPa, the gas evolution and LOI are 9.62 mL⋅g-1 and 1.92%, respectively. [ABSTRACT FROM AUTHOR] |
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