Si3N4-SiCp composites reinforced by in situ co-catalyzed generated Si3N4 nanofibers
Journal of Nanomaterials
Hindawi Publishing Corporation
Copyright © 2014 Juntong Huang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Si 3 N 4 - SiC p composites reinforced by in situ catalytic formed nanofibers were prepared at a relatively low sintering temperature. The effects of catalyst Co on the phase compositions, microstructures, and physicochemical-mechanical properties of samples sintered at 1350°C-1450°C were investigated. The results showed that the catalyst Co enhanced the nitridation of Si. With the increase of Co addition (from 0 wt% to 2.0 wt.%), the apparent porosity of as-prepared refractories was initially decreased and subsequently increased, while the bulk density and the bending strength exhibited an opposite trend. The Si 3 N 4 - SiC p composites sintered at 1400°C had the highest strength of 60.2 MPa when the Co content was 0.5 wt.%. The catalyst Co facilitated the sintering of Si 3 N 4 - SiC p composites as well as the formation of Si3N4 nanofibers which exhibited network connection and could improve their strength. © 2014 Juntong Huang et al.
This work was financially supported by National Natural Science Foundation of China (Grant no. 51032007).
This is the final version of the article. Available from the publisher via the DOI in this record.
Volume 2014, Article ID 752378