Ou Jun ¹, HUANG Minzhong ¹, HUANG Yao ¹, JIANG Zhishui ², WU Shanghua ¹

(1. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, Guangdong, China; 2. Guangdong JC Technological Innovation Eletronics CO., LTD, Zhaoqing 526060, Guangdong, China)

Abstract: Green parts with complex structures were successfully fabricated from preceramic polymer/photosensitive resin slurries containing inert fillers (Si3N4 whiskers) by using digital light processing (DLP) 3D-printing technique. After pyrolysis, the green parts were transformed into polymer-derived ceramic matrix composites, their morphology and structure intact were retained. The introduction of the ceramic fillers not only prevented the collapse of the green parts during pyrolysis, but also effectively reduced the linear shrinkage and weight loss of the ceramic materials. Also, as a reinforcing phase, it significantly improved mechanical properties of the final composites. When the mass fraction of filler content was 10 wt.%, the bending strength of the composites could reach (160.9 ± 19.7) MPa. In addition, the effects of filler content on the microstructure and porosity of the composites were discussed. It was found that excessive filler would lead to an increase in porosity and a decrease in matrix continuity, resulting in a decrease in mechanical properties of the composites.

Key words: 3D-printing; preceramic polymer; composites; mechanical properties