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.