Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7886757 | Ceramics International | 2018 | 6 Pages |
Abstract
SiC whisker and Si3N4 whisker-reinforced Si3N4-SiC ((SiCw-Si3N4w)/(Si3N4-SiC)) composite was synthesized by 3D printing for the first time, by the combination of printed-Si-body nitridation and chemical vapor infiltration-SiC methods. The mechanical properties of the composite could be optimized through the adjustment of SiCw content and load direction. A SiCw content of 3â¯wt% was found to be the optimal scheme, and accordingly, the average bulk density increased by 22.4%, the bending strength increased by 63.6%, the compressive strength parallel to the printing layer increased by 404.8%, and the compressive strength perpendicular to the printing layer increased by 157.1%, compared with the bulks without whiskers. The enhanced mechanical performance was mainly attributed to the process of densification by CVI, and the effect of the homogeneous whiskers bridging, pull-out and deflecting crack to expend energy. The achieved indices meet the requirements for 3D-printed porous ceramic matrix composite targeted for commercial and military field applications.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Shanshan Xiao, Hui Mei, Daoyang Han, Wenyu Yuan, Laifei Cheng,