High-Temperature Deformation of Si₃N₄/Si₃N₄-SiC Hybrid Composites with Belt-Like Network Structure of Si₃N₄-SiC Composites

Abstract

Superplastic deformation and creep resistance of Si₃N₄/Si₃N₄-SiC hybrid composites that formed belt-like network structure by Si₃N₄-SiC composite domain (the second domain) were investigated with tensile tests at 1873K and with bending tests at 1473K, respectively. The supserplastic elongation of Si₃N₄/Si₃N₄-SiC hybrid composites was dramatically improved with decreasing in SiC contents of the second domain from 20wt% to 10wt%. As the results, the Si₃N₄/Si₃N₄-SiC hybrid composites exhibited superplastic elongation more than 200% at 1873K. Furthermore, the hybrid composites exhibited the high-performance in both of the superplasitc deformation and the creep resistance.