Si3N4-SiCp Composites Reinforced by In Situ Co-Catalyzed Generated Si3N4 Nanofibers

Abstract EN

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.