The effects of microstructure and residual stress on the mechanical properties of Si3N4-based three-layer composite materials were investigated. The microstructure of each laver was controlled by the addition of two differently sized silicon carbides: fine SiC nanoparticles (∼200 nm) or relatively large SiC platelets (∼20 μm). When the SiC nanoparticles were added, the average grain size of Si3N4 was reduced because of the inhibition of grain growth by the particles. On the other hand, when the SiC platelets were added, the microstructure of Si3N4 was not much changed because of the large size of the platelets. Three-layer composites were fabricated by placing the Si3N4/SiC-nanoparticle layers on the surface of the Si3N4/SiC-platelet layer. The residual stress was controlled by varying the amount of SiC added. The mechanical properties of three-layer composites with various combinations of microstructure and residual stress level were investigated.
|Number of pages||4|
|Journal||Journal of the American Ceramic Society|
|Publication status||Published - 1998 Oct|
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry