|
Si3N4 Physical Properties
|
Density （g/cm3）
|
3.26
|
|
Relative density, ％
|
>99.5
|
|
Elastic modulus, GPa
|
300～320
|
|
Compression strength (,25℃)
|
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
MPam1/2
|
7.0
|
10
|
4.2
|
3.9
|
25
|
|
Bending strength, MPa（700℃）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
|
| |