ZrO2 ceramic parts were prepared by DLP technology. The effects of powder characteristics, solid-phase content and sintering temperature on the properties of the parts were studied. The results show that the optimal grinding parameters are rotation speed of 500 r/min and grinding time of 5h, and the average particle size of ZrO2 powder is 8 μm; With the increase of solid-phase content, the viscosity and fluidity of slurry increase; Increasing grinding speed and time can slow down the increase of viscosity and improve the fluidity of slurry; When the solid-phase content is 70% and the temperature is 1600℃, the effect of the sintered part is the best. With the increase of the solid-phase content, the shrinkage of the sintered part decreases and the compressive strength increases. The experimental results are verified by SEM micro morphology test.
Polylactic acid (PLA) is a biodegradable material widely used in biomedical field. In order to improve the performance of pure PLA, 316 L stainless steel content of 10 vol% to 60 vol % was added to the PLA matrix. Powder physical characteristics tester was used to explore the angle of repose, the angle of collapse, the angle of flat plate and compressibility, the integrated thermal analyzer was for detecting thermal properties of PLA/316 L stainless steel composite. The results showed that the angle of repose and angle of collapse of the composite decreases first and then increases with the increase of 316 L stainless steel powder. The angle of flat plate and compressibility was reduced by the addition of steel powders. When the 316 L stainless steel powder content is 50 vol %, the fluidity of the composite is the best. The high melting point of 316 L stainless steel powder increases the melting point temperature of composites. The prepared PLA/316 L composites can be applied to 3D printing technology represented by fused deposition modeling (FDM).
In order to solve the problem that the surface quality of the parts by FDM is poor due to the staircase effect, a new method combining milling and FDM additive manufacturing was proposed. In this study, a composite processing device for additive and subtractive materials was designed for small forming parts. First of all, put forward a set of overall structure design scheme. Secondly, the key components of composite machining device were designed. Then, the designed parts were assembled virtually. Finally, the finite element simulation method was used to analyze the gantry frame and worktable. The results show that the design scheme can meet the requirements of strength and stiffness.
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