FCT Si3N4 Standard Materials
FCT-Denotation
Process
SN-GP
SN-HP
SN-HIP
Gas Pressure Sintered
Hot Pressed
Hot Isostatic Pressed
Grey / Black
Grey / Black
Grey / Black
Three-Dimensional
Components
Planar Structures
Three-Dimensional
Components, Non-Porous
Ø 610 mm, length 1500 mm
Ø 400 mm, thickness 75 mm
Ø 280 mm, length 680 mm
Color
Geometry
Maximum size
Mechanical Engineering,
Mechanical Engineering,
Mechanical Engineering,
Bearing Applications, Foundry Foundry Technology, Chemical Bearing Applications, Foundry
Technology, Chemical Plant
Plant Engineering and
Technology, Chemical Plant
Engineering and Construction, Construction, Air and Space Engineering and Construction,
Air and Space Applications
Applications
Air and Space Applications
Application
General Properties
Chemical Composition
Sinter Additives
Density ρ
Residual Porosity
Open Porosity Thereof
Grain Size (Length)
[1]
(%)
(%)
(%)
(µm)
Si3N4
Si3N4
Si3N4
RE2O3 / Al2O3
RE2O3 / Al2O3
RE2O3 / Al2O3
3.18 - 3.40
<1
0
1 - 15
3.18 - 3.41
< 0.5
0
1 - 10
3.18 - 3.26
< 0.2
0
1 - 15
Mechanical Properties
Compressive Strength
Bending Strength σ RT
Weibull-Modulus m
Youngs Modulus E
Hardness HV
Fracture Toughness KIc
[2]
[3]
[4]
(MPa)
(MPa)
(GPa)
(GPa)
(MPam1/2)
Poissons Ratio ν
3000
730
18
300
15.0
7.0
0.26
3000
970
20
300
15.0
6.2
0.26
1400
1200
700
25
3.2
1.9
1.4
558
13955
1400
1200
700
24
3.2
1.9
1.4
748
17945
3000
760 - 830
12
300 - 310
15.3 - 15.6
6.5 - 6.2
0.26
Thermal Properties
Maximum Working Temperatures
- Inert Atmosphere
- Oxidising Atmosphere
Specific Heat Capacitiy
Thermal Conductivity λ (20°C)
(°C)
(°C)
(J/kgK)
(W/mK)
Coefficient of Thermal Expansion
RT-1000 °C
RT- 250 °C
Thermal Shock Parameter R1
Thermal Shock Parameter R2
RT ± 20 °C
[5]
[6]
(10-6K-1)
(10-6K-1)
(10-6K-1)
(K)
(W/m)
1400
1200
700
25
3.2
1.9
1.3
590 - 620
14650 - 15480
Electrical Properties
Electrical Resistivity (RT)
Dielectric Constant (1 MHz)
10
Ωcm
-
14
8
RT = Room Temperature
[1] Determination of density and porosity according to DIN 623-2
[2] Average value of 4-point bending strength at room temperature according to DIN EN 843-1
[3] Hardness according to DIN EN 843-4
[4] Calculated from crack length derived from Vickers hardness indentation, according to Niihara
[5] Critical temperature difference for an infinite high heat transfer (quenching)
10
14
8
10
14
8
Date: December 2016
[6] Thermal shock coefficient at finite constant heat transfer (slowly heating)
The material characterisitics listed above are measured at testing samples. They cannot be transfered to components with different size,
shape or surface properties. We reserve the right to alter properties within the scope of technical progress or new developments.
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