Silicon Nitride (Si3N4)

We've just introduced a new Direct Sintered Silicon Nitride (Si₃N₄) powder-to-part component manufacturing process that provides a high-performance, cost-effective material solution. The material should be of interest to manufacturers looking for a material with a high strength-to-weight ratio, which compares favorably even with metallic nickel-based “superalloys”. The material also exhibits an unusually low coefficient of thermal expansion, which is a useful property for designers working with high temperature applications.

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Property Charts & Safety Data Sheets
Property ChartsSilicon Nitride
Master Ceramics Property ChartFull Color
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Safety Data SheetsN/A

Materials Property Chart
 PropertyASTM MethodUnitsSilicon Nitride (Si3N4)
 ElectricalDielectric Strength (.125" Thick)D 149-97AV/mil300
Dielectric Constant @ 1 MHzD 150-98--9.2
Volume Resistivity, 25°CD 257ohms-cm> 1 x 1014
ThermalC.T.E. 25 - 600° CC 372-96x 10-6/C2.9
Thermal Conductivity @ RTC 408W/m K29
Max Use Temp--Fahrenheit (°F)2552
--Celsius (°C)1400
MechanicalDensityC 20-97g/cc3.25
HardnessVickers 500gmGPa (kg/mm2)15 (1529)
Fracture ToughnessNotched BeamMPam1/26
Flexural Strength (MOR)
(3 point) @ RT
F417-87MPa (psi x 103900 (130)
Tensile Strength @ RT--MPa (psi x 103)537 (78)
Compressive Strength @ RT--MPa (psi x 103)2500 (362)
Elastic ModulusC848GPa (psi x 106)300 (44)
Poisson's RatioC848--0.28
GeneralCrystal Size (Average)Thin SectionMicrons4
Gas Permeability--atms-cc/secgas tight <10-10
Water AbsorptionC 20-97%0
Note: The information in this data sheet is for design guidance only. STC does not warrant this data as absolute values. Forming methods and specific geometry could affect properties. Slight adjustments can be made to some of the properties to accommodate specific customer requirements. Most of the dense materials in the table are resistant to mechanical erosion and chemical attack. STC has performed ASTM testing qualification for certain compositions, in accordance with ASTM D2442. Please consult our technical staff for appropriate material and specific test results.