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CeramTec SL 200 ST Silicon Nitride, Si3N4-Y2O3
Categories: Ceramic; Nitride

Material Notes: SL 200 ST is a silicon nitride ceramic especially suitable for components exposed to mechanical stress and engine-specific applications even at elevated temperatures. It is recognized for its high strength and crack resistance, as well as its resistance to sudden changes in temperature. In contrast to the other silicon nitride materials, this is a gas-pressure sintered Si3N4 and hence possesses much better mechanical properties such as greater flexural strength, fracture toughness, and a higher Weibull modulus.

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Physical PropertiesOriginal ValueComments
Density 3.21 g/ccDIN EN 623-2 / ASTM-C373 / ASTM-C20
Water Absorption 0.00 %DIN EN 623-2 / ASTM-C373
Permeability 0.00Gas
Weibull Modulus 15DINV ENV 843-5
 
Mechanical PropertiesOriginal ValueComments
Vickers Microhardness 1500HV 0.5; DINV ENV 843-4
Tensile Strength at Break 750 MPaACMA Test #4 / DIN EN 843-1
Tensile Modulus 305 GPaYoung's; DINV ENV 843-2 / ASTM-F417
Flexural Strength 900 MPaDIN EN 843-1
Compressive Strength 3000 MPaASTM C-773-88 / DIN 51067T1
Poissons Ratio 0.26DINV ENV 843-2
Fracture Toughness 7.00 MPa-m½DIN 51109
Shear Modulus 121 GPaCalculated
 
Electrical PropertiesOriginal ValueComments
Volume Resistivity 1.00e+14 ohm-cmASTM-D257
Dielectric Constant 8.0
@Frequency 1e+6 Hz
IEC 672-1 / ASTM-C150
Dielectric Loss Index 0.00010
@Frequency 1e+9 Hz
IEC 672-1 / ASTM-D149,150
 
Thermal PropertiesOriginal ValueComments
CTE, linear 3.20 µm/m-°C
@Temperature 20.0 - 200 °C
DIN EN 821-1
 4.30 µm/m-°C
@Temperature 20.0 - 1000 °C
DIN EN 821-1
Specific Heat Capacity 0.700 J/g-°C
@Temperature 100 - 200 °C
DINV ENV 821-3
Thermal Conductivity 21.0 W/m-K
@Temperature 20.0 - 100 °C
DIN EN 821-2 / ASTM-C408
Maximum Service Temperature, Air 1300 °C
Maximum Service Temperature, Inert 1600 °C

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