Goodfellow Hot Pressed Silicon Nitride Si 3 N 4

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Goodfellow Hot Pressed Silicon Nitride Si₃N₄
Categories:	Ceramic; Nitride
Material Notes:	Hot pressing of Silicon Nitride produces a material of virtually zero porosity. This hard, grey ceramic is still very lightweight. Silicon Nitride shows good resistance to wear and abrasion. It shows very little oxidation at elevated temperatures, and high hardness and strength above 1000°C. One of its main assets is its resistance to thermal shock, due to the low thermal expansion coefficient. This material can be diamond ground to precise tolerances. It is used in gas turbine situations, as diesel engine components and as a electrical insulators. Information provided by Goodfellow.
Key Words:	Si3N4; HPSN; NITRASIL® R
Vendors:	No vendors are listed for this material. Please click here if you are a supplier and would like information on how to add your listing to this material.
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Physical Properties	Metric	English	Comments

Density	3.11 g/cc	0.112 lb/in³
Porosity	0.00 %	0.00 %	Apparent

Mechanical Properties	Metric	English	Comments
Hardness, Vickers	1700 - 2200	1700 - 2200	kgf/mm²
Tensile Modulus	280 - 310 GPa	40600 - 45000 ksi
Compressive Strength	2000 - 3500 MPa	290000 - 508000 psi
Shear Strength	480 - 960 MPa	69600 - 139000 psi

Electrical Properties	Metric	English	Comments
Volume Resistivity	1.00e+12 - 1.00e+15 ohm-cm	1.00e+12 - 1.00e+15 ohm-cm
Dielectric Constant	10	10

Thermal Properties	Metric	English	Comments
CTE, linear	3.30 µm/m-°C @Temperature 20.0 - 1000 °C	1.83 µin/in-°F @Temperature 68.0 - 1830 °F
Specific Heat Capacity	0.680 - 0.800 J/g-°C	0.163 - 0.191 BTU/lb-°F
Thermal Conductivity	15.0 - 43.0 W/m-K	104 - 298 BTU-in/hr-ft²-°F
Sublimation Temperature	1900 °C	3450 °F
Maximum Service Temperature, Inert	1650 °C	3000 °F

Component Elements Properties	Metric	English	Comments
Si3N4	100 %	100 %

Descriptive Properties
Chemical Resistance - Alkalis	Good - Poor
Chemical Resistance - Concentrated Acids	Fair
Chemical Resistance - Dilute Acids	Good
Chemical Resistance - Halogens	Good - Poor
Chemical Resistance - Metals	Fair

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CGOODF247 / 197410

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