Dense Silicon Nitride (IEC 60672 Type C-935)
Dense silicon nitride is a grade of silicon nitride. The graph bars on the material properties cards below compare dense silicon nitride to other non-oxide engineering ceramics (top) and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Thermal Properties
Maximum Temperature: Mechanical
1000 °C 1830 °F
Maximum Thermal Shock
290 °C 550 °F
Specific Heat Capacity
800 J/kg-K 0.19 BTU/lb-°F
Thermal Conductivity
30 W/m-K 17 BTU/h-ft-°F
Thermal Expansion
2.5 µm/m-K
Electrical Properties
Dielectric Constant (Relative Permittivity) At 1 Hz
10
Dielectric Constant (Relative Permittivity) At 1 MHz
8.4
Dielectric Strength (Breakdown Potential)
18 kV/mm 0.7 V/mil
Electrical Dissipation At 1 Hz
0.0019
Electrical Dissipation At 1 MHz
0.0017
Electrical Resistivity Order of Magnitude
11 10x Ω-m
Other Material Properties
Density
3.4 g/cm3 210 lb/ft3
Elastic (Young's, Tensile) Modulus
280 GPa 41 x 106 psi
Flexural Strength
340 MPa 50 x 103 psi
Common Calculations
Stiffness to Weight: Axial
46 points
Stiffness to Weight: Bending
65 points
Thermal Diffusivity
11 mm2/s
Followup Questions
Further Reading
Silicon Nitride and the Sialons, Vivien Mitchell, 1993
Handbook of Refractory Carbides and Nitrides: Properties, Characteristics, Processing and Applications, Hugh O. Pierson, 1996
IEC 60672-3: Ceramic and glass-insulating materials - Part 3: Specifications for individual materials
Springer Handbook of Condensed Matter and Materials Data, W. Martienssen and H. Warlimont (editors), 2005
Sintering of Advanced Materials: Fundamentals and Processes, Zhigang Zak Fang (editor), 2010