■ 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 |
|