Structure of Hydrogel Support for Graphene/SiC Composite Prepared by Dual Extruder 3D Printer

WU Xuexue; LIU Hongjun; LI Yajun; TANG Run; YATSKOVSKYI Dmytro; LI Yamin

doi:10.3969/j.issn.1674-6457.2025.07.018

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (7) : 164-174. DOI: 10.3969/j.issn.1674-6457.2025.07.018

Additive Manufacturing

Structure of Hydrogel Support for Graphene/SiC Composite Prepared by Dual Extruder 3D Printer

WU Xuexue^a, LIU Hongjun^a,b,*, LI Yajun^a, TANG Run^a, YATSKOVSKYI Dmytro^a, LI Yamin^a,b

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Abstract

The work aims to provide reference for designing the structure of hydrogel support for preparation of graphene/SiC composite by dual extruder 3D printer. Firstly, the starch-based hydrogel was prepared and its rheological properties, ablative properties, formability of extruded filaments and load capacity were analyzed. Then, the effects of structural pattern, printing direction and filling ratio on the accuracy of hydrogel support were investigated through the printing of 3D grid samples, and the matching span between support composites was optimized. Finally, the optimized parameters were applied to hydrogels and parts with complex structures were prepared. When the inclination angle of graphene/SiC composites was lower than 70°, the wedge-shaped parts were obviously deformed, and the hydrogel showed obvious shear thinning characteristics. After ablation at 800 ℃, there was almost no residue, and the extruded filaments were complete and uniform, which could independently load 8 mm high composites. Different structural patterns were rectilinear, honeycomb, wiggle and triangular in order of support height deviation from small to large. The deviation in the height direction for the rectilinear pattern was the smallest ((+0.08±0.23) mm) at printing direction 0° and the largest at printing direction 30°, and the range of error line was widest ((+0.48±0.3) mm). With the increase of filling ratio, the effect of filling ratio on height deviation first decreased and then increased. When the filling ratio was 50%, the height deviation of hydrogel support was the smallest. There should be a certain span between graphene/SiC composite and hydrogel support, but when the span exceeded 1 mm, the suspended position was obviously deformed. The trial-production results of parts showed that the optimized hydrogel support structure could be used to prepare graphene/SiC composites with complex structures. Hydrogel has low cost, good extrusion forming, less sintering residue, simple removal process and certain load capacity, and can be used as a support material for preparation of graphene/SiC composites by dual extruder 3D printer. The optimized parameters of hydrogel support structure are linear mode, printing direction 0°, filling ratio of 50%, and matching span of the two materials of 1 mm.

Key words

dual extruder 3D printer / graphene/SiC composite / hydrogel / support structure / slurry extrusion

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WU Xuexue, LIU Hongjun, LI Yajun, TANG Run, YATSKOVSKYI Dmytro, LI Yamin. Structure of Hydrogel Support for Graphene/SiC Composite Prepared by Dual Extruder 3D Printer[J]. Journal of Netshape Forming Engineering. 2025, 17(7): 164-174 https://doi.org/10.3969/j.issn.1674-6457.2025.07.018

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