基于直写3D打印的级配SiC陶瓷浆料颗粒分布研究OA

Direct ink writing(DIW)3D printing with its high design flexibility and rapid manufacturing capabilities,offers an effective way to overcome the difficulties and application limitations of traditional processing methods for SiC.During the DIW process,nozzles with different diameters can induce variations in the distribution of SiC particles within the ex-truded filaments.These variations significantly affect the pore distribution in the fina1 SiC samples,thereby influencing the subsequent densification outcomes.This study investigates the distribution rule of graded SiC particles in direct ink writing 3D printing extrusion process through experiments and numerical simulations.The results indicate that the variation in shear rate at the nozzle's central region is the primary factor influencing the distribution of graded particles.When nozzle diam-eters are 800 μm and 1 mm,the shear rate variation in the central region exceeds 80%,and the drag force on coarse particles is sufficient to counteract the effects of shear rate variation.In contrast,for nozzle diameters of 500 μm and 600 μm,the shear rate variation in the central region is less than 50%,reducing the shear stress difference and resulting in a more uni-form distribution of SiC particles in the extruded filaments.