Study on Particle Distribution of Graded SiC Ceramic Slurry based on Direct Ink Writing 3D Printing

LI Sai; SHE Zhonghang; ZHU Fawen; ZHANG Bo; CHEN Kaidong; REN Quanyao; PU Zengping

doi:10.7512/j.issn.1001-2303.2026.03.09

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Study on Particle Distribution of Graded SiC Ceramic Slurry based on Direct Ink Writing 3D Printing
Vol. 56, Issue 3, Pages: 67-72(2026)
Received：18 January 2026，

Revised：2026-02-08，

Published：20 March 2026
DOI： 10.7512/j.issn.1001-2303.2026.03.09
稿件说明：

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李赛，佘仲航，朱发文，等.基于直写3D打印的级配SiC陶瓷浆料颗粒分布研究［J］.电焊机，2026，56（3）：67-72. DOI： 10.7512/j.issn.1001-2303.2026.03.09.

LI Sai, SHE Zhonghang, ZHU Fawen, et al.Study on Particle Distribution of Graded SiC Ceramic Slurry based on Direct Ink Writing 3D Printing[J].Electric Welding Machine, 2026, 56(3): 67-72. DOI： 10.7512/j.issn.1001-2303.2026.03.09.

摘要

将直写3D打印应用于SiC制备是突破SiC传统加工困难和应用受限的有效途径。在直写3D打印过程中，不同直径喷嘴会导致挤出丝内的SiC颗粒分布发生一定程度变化，这种改变会显著影响最终SiC试样的孔隙分布，继而导致后续致密化效果产生差异。本文研究了级配SiC颗粒在直写3D打印挤出过程中的分布规律，通过试验与数值模拟，对级配SiC浆料在挤出过程中的颗粒分布规律与作用机理展开研究和分析。结果表明：喷嘴中心区域的剪切速率变化是导致级配颗粒分布发生改变的主要原因，喷嘴直径为800 μm和1 mm时，喷嘴中心区域剪切速率变化率超过80%，此时粗颗粒所受曳力较大，可以有效抵消剪切速率变化率带来的影响，而细颗粒曳力相对较小，在剪切应力差的作用下朝挤出丝芯部聚拢；当喷嘴直径为500 μm和600 μm时，喷嘴中心区域的剪切速率变化率小于50%，剪切应力差减少，使得挤出丝中的SiC颗粒分布更为均匀。

Abstract

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 extruded 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 diameters 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 uniform distribution of SiC particles in the extruded filaments.

关键词

Keywords

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