IAM - Ceramic Materials and Technologies

SiC/Si3N4 nano/micro-composite - processing, RT and HT mechanical properties

  • Author:

    Sajgalik, P.; Hnatko, M.; Lofaj, F.; Hvizdos, P.; Dusza, J.; Warbichler, P.; Hofer, F.; Riedel, R.; Lecomte, E.; Hoffmann, M. J.

     
  • Source:

    JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 20 (2000), 4, 453–462 

  • SiC/Si3N4 nano/micro-composite - processing, RT and HT mechanical properties.

Abstract

Two SiC/Si3N4 nano/micro composites were prepared from a starting mixture of crystalline alpha-Si3N4, amorphous SiNC, Y2O3 and/or Al2O3. The composite material for room temperature (RT) application has high strength of 1200 MPa, Weibull modulus of 19 and moderate fracture toughness of 7 MPa m(1/2). The composite for high temperature (HT) application, without Al2O3 has RT strength of 710 MPa and is able to keep 60% of its RT strength up to 1300 degrees C, The creep resistance of composite material is approx. 1 order higher compared to relative monolith up to 1400 degrees C.