"Reliable Ceramics for Advanced Heat Engines," V.K. Pujari, D.M. Tracey, M.F. Foley, N.I. Paille, P.J. Pelletier, L.C. Sales, C.A. Willkens, and R.L. Yeckley, American Ceramic Society Bulletin, Vol. 74 [4], pp. 86-90 (1995), published by American Ceramic Society.

"The material produced is designated NCX-5102 and consists of a silicon nitride-4% yttria composition that is densified by glass-encapsulation HIPing. ... Large-scale batches (30 kg) of Si₃N₄-4% Y₂O₃ powder were milled in water, and the slurry was used to cast hundreds of tensile rods. The starting Si₃N₄ powder (Ube) was derived from a dimmide process. ... The net-shape-formed bars were HIPed using glass encapsulation (ASEA Cerma AB, Robertsford, Sweden). The HIP process was optimized using pressure, time and temperatures to assure full densification and development of an elongated microstructure for desired fracture toughness..."

• Material Number 1: Si₃N₄·x Y₂O₃
  
  • Material
    
  • Elemental Composition
    
  • Sintering Aids
    
  • Flexural Strength
    
  • Tensile Strength
    
  • Weibull Modulus
    
  • Weibull Strength
    

"The nonlinear character of the distribution with multiple inflections suggests that a two-parameter Weibull fit of these data (₀ = 1038 MPa, m = 10.4) is inappropriate and that the multimodal nature of the data should be represented using competing risk analysis. ... The important feature of the three-parameter Weibull distribution is the existence of a threshold stress below which there is zero proability of failure."

"The nonlinear character of the distribution with multiple inflections suggests that a two-parameter Weibull fit of these data (₀ = 1038 MPa, m = 10.4) is inappropriate and that the multimodal nature of the data should be represented using competing risk analysis. The important feature of the three-parameter Weibull distribution is the existence of a threshold stress below which there is zero probability of failure."

"The nonlinear character of the distribution with multiple inflections suggest that a two-parameter Weibull fit of these data (₀ = 1038 MPa, m = 10.4) is appropriate and that the multimodal nature of the data should be represented using competing risk analysis. The important feature of the three-parameter Weibull distribution is the existence of a threshold stress below which there is zero probability of failure."

"The nonlinear character of the distribution with multiple inflections suggests that a two-parameter Weibull fit of these data (₀ = 1038 MPa, m = 10.4) is inappropriate and that the multimodal nature of the data should be represented using competing risk analysis. The important feature of the three-parameter Weibull distribution is the existence of a threshold stress below which there is zero probability of failure."