Articles
  • Fabrication and mechanical properties of silicon nitride laminate composites 
  • Dong-Woo Shin* and Hai Guo
  • Ceramic Matrix Composites (CMCs) Lab., Division of Advanced Materials Science and Engineering, Engineering Research Institute, Gyeongsang National Univesity, Jinju, Gyeongnam 660-701, Korea
Abstract
A compact material with a laminated structure similar to the structure of nacre has been successfully made using a procedure described in this paper. This laminated structural design provides high-fracture toughness to Si3N4/BN-Al2O3 ceramic composites. The dense Si3N4 laminate (99.6% of theoretical density) had a flexural strength of 500 Mpa and a fracture toughness of 15 MPa·m1/2. The introduction of reinforcement (15 wt% SiC whiskers) within the Si3N4/BN-Al2O3 laminated ceramic composites further increases the strength and fracture toughness values to 650 MPa and 20 MPa·m1/2, respectively.

Keywords: Silicon nitride, laminate composites, fracture toughness, SiC whiskers

This Article

  • 2005; 6(3): 263-265

    Published on Sep 30, 2005