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 Charts Silicon Nitride
Master Ceramics Property Chart Full Color
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Materials Property Chart
  Property ASTM Method Units Silicon Nitride (Si3N4)
 Electrical Dielectric Strength (.125" Thick) D 149-97A V/mil 300
Dielectric Constant @ 1 MHz D 150-98 -- 9.2
Volume Resistivity, 25°C D 257 ohms-cm > 1 x 1014
Thermal C.T.E. 25 - 600° C C 372-96 x 10-6/C 2.9
Thermal Conductivity @ RT C 408 W/m K 29
Max Use Temp -- Farenheit (°F) 2552
-- Celsius (°C) 1400
Mechanical Density C 20-97 g/cc 3.25
Hardness Vickers 500gm GPa (kg/mm2) 15 (1529)
Hardness -- R45N 83
Fracture Toughness Notched Beam MPam1/2 6
Flexural Strength (MOR)
(3 point) @ RT
F417-87 MPa (psi x 103 900 (130)
Tensile Strength @ RT -- MPa (psi x 103) 537 (78)
Compressive Strength @ RT -- MPa (psi x 103) 2500 (362)
Elastic Modulus C848 GPa (psi x 106) 300 (44)
Poisson's Ratio C848 -- 0.28
General Crystal Size (Average) Thin Section Microns 4
Color -- -- Black
Gas Permeability -- atms-cc/sec gas tight <10-10
Water Absorption C 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.