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Silicon carbides and Silicon Nitride ceramics
      SiC, Reaction Bonded SiC, Sintered Si3N4  
    Purity % >90 >98 >98  
    Density g/cm^3 >2.98 >3.10 >3.20  
    Hardness Vickers 1kg kg/mm^2 2200 2400 2300  
    Modulus of Elasticity GPa 390 420 290  
    Fracture toughness MPa*m^1/2 4.3 4.5 >5.6  
    Flexural Strength (MOR) MPa 420 450 650
    Compressive Strength MPa 2500 3200 3000
    Thermal Expansion (CTE) 10^-6/K 4.3 4.4 3.3
    Thermal Conductivity W/(m·K) 120 140 30
             
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Silicon Nitride Silicon Carbide Tungsten Carbide Alumina Ceramics Carbon Graphites