Si3N4

■   Si3N4 Physical Properties
Density (g/cm3 3.26
Relative density, % > 99.5
Elastic modulus, GPa 300 ~ 320
Compression strength (,25 °C) 40 ~ 50
Hardness (HV, MPa) 1600 - 2000
Fracture toughness, MPam1/2 6.0 ~ 9.0
Bending strength, MPa 600 ~ 1000
Poisson's ratio 0.25
Linear expansion coefficient , 10-6K-1 3.1 ~ 3.3
Webuller modulus 12 ~ 15
Thermal conductivity, W(mK)-1 15 ~ 20
Specific resistance ratio 1018
Corrosion resistance Excellent
Size stability Excellent
Magnetic No
■   Comparing with Other Materials
  Si3N4 ZrO2 99.5% Al2O3 SiC Steel
Density, g/cm3 3.26 6.05 3.92 3.2 7.85
Water absorption, % 0 0 0 0 0
Elastic modulus, GPa 300 210 340 440 208
Linear expansion coeff. , 10-6K-1 3.2 10.5 8.5 3.0 12.5
Hardness(HV) MPa 1600 1200 1650 2800 700
Fracture toughness, MPam1/2 7.0 10 4.2 3.9 25
Bending strength, MPa(700 °C)MPa 450 210 230 380 \
Compression strength(RT) MPa 2500 2000 2200 1800 \
Poisson's ratio 0.25 0.3 0.22 0.17 0.3
Thermal conductivity, W(mK)-1 20 2 26 120 40
Resistivity > 1015 > 1015 > 1016 > 103 0.1 ~ 1
Max.Working Temperature (No load) 1100 750 1750 1550 300
Corrosion resistance Strong Strong Strong Strong Weak
 
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