Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7887578 | Ceramics International | 2018 | 25 Pages |
Abstract
The ZrB2-SiC ceramics with homogenous microstructures were successfully fabricated by the optimized gel-casting method and pressureless sintering. The effects of the processing parameters, including the monomer content, cross-linker/monomer ratios, initiator addition, catalyst concentration and polymerization temperature, on the final gel properties were systematically investigated. The rheological behavior and stability of ZrB2-SiC suspensions were evaluated, and the microstructures and mechanical properties of sintered ceramics were also analyzed. The homogenous gel networks containing low monomer content (4 wt%) and without catalysts had been successfully obtained, which could be mainly attributed to the homogeneous distribution of crosslinking points and temperature-induced gelation. The crack-free and complex-shaped ZrB2-SiC ceramic composites were achieved by the optimized gel-casting, which could reach the highest relative density of 97.2% and the flexural strength of 402 ± 57 MPa, respectively. This study provides an optimized gel-casting process for fabricating ZrB2-SiC ceramics with excellent properties by low colloidal additives and without catalysts.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Wenhu Hong, Ping Hu, Dongyang Zhang, Maosong Xie, Yang Yang, Shanyi Du,