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Si3N4  Physical Properties

Density      g/cm3

3.26

Relative density, 

>99.5

Elastic modulus, GPa

300320

Compression strength  (,25)

4050

Hardness HV, MPa

1600 - 2000

Fracture toughness,  MPam1/2

6.09.0

Bending strength, MPa

6001000

Poisson's ratio

0.25

Linear expansion coefficient , 10-6K-1

3.13.3

Webuller modulus

1215

Thermal conductivity, WmK-1

1520

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

HardnessHV MPa

1600

1200

1650

2800

700

Fracture toughness,  MPam1/2
MPam1/2

7.0

10

4.2

3.9

25

Bending strength, MPa700MPa

450

210

230

380

\

Compression strengthRT MPa

2500

2000

2200

1800

\

Poisson's ratio

0.25

0.3

0.22

0.17

0.3

Thermal conductivity, WmK-1

20

2

26

120

40

Resistivity

>1015

>1015

>1016

>103

0.11

Max.Working Temperature No load

1100

750

1750

1550

300

Corrosion resistance

Strong

Strong

Strong

Strong

Weak

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