The microstructural evolution and mechanical properties of Si3N4-SiC composites obtained by the sinter-post-HIP process were investigated. SiC addition prohibited β-Si3N4 grain growth; however, the grain growth followed the empirical growth law, with exponents of 3 and 5 for the c- and the a-axis directions, respectively. Mechanical properties were strongly influenced by SiC addition and sintering conditions. Short-crack propagation behavior was measured and analyzed by the indentation-strength in-bending (ISB) method. The present composites had high short-crack toughness, compared with the values for monolithic Si3N4. The enhanced short-crack toughness was attributed to crack-tip bridging by the SiC particles.
|Number of pages||7|
|Journal||Journal of the American Ceramic Society|
|Publication status||Published - 2001 Jan 1|
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry