Click on table links below to see properties
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Ferro-Ceramic Grinding Inc. machines over 15 different materials

Silicon Nitride

Silicon Nitride Properties
Silicon Nitride (Si 3 N 4 ) Silicon Nitride has the strongest covalent bond properties next to silicon carbide.

Silicon Nitride Properties

Silicon Nitride (Si3N4)

Silicon Nitride has the strongest covalent bond properties next to silicon carbide. It is used as a high temperature structural ceramic due to superior heat resistance, strength, and hardness. The wear and corrosion resistance are excellent. There are various types available (Sintered, CVD, HP) for different purposes.

Main applications include heat exchangers, rotors, nozzles, bearings, valves, chemical plant parts, engine components, and armor.

  

Properties
Units
Test
Value
Physical
Chemical Formula
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Si3N4
Density, r
g/cm3
ASTM C20
3.31
Color
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dark gray
Crystal Structure
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hexagonal (alpha & beta)
Water Absorption
% @R.T.
ASTM C373
0.0
Hardness
Moh's
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9
Hardness
knoop (kg/mm2)
Knoop 100g
2200
Mechanical
Compressive Strength
MPa @ R.T.
ASTM C773
689-2760
Tensile Strength
MPa @ R.T.
ACMA Test #4
360-434
Modulus of Elasticity
(Young's Mod.)
GPa
ASTM C848
317
Flexural Strength (MOR)
MPa @ R.T.
ASTM F417
679-896
Poisson's Ratio, u
ASTM C818
0.23
Fracture Toughness, KIc
MPa x m1/2
Notched Beam Test
5.0-8.0
Thermal
Max. Use Temperature
(* denotes inert atm.)
șC
No load cond.
1500
Thermal Shock Resistance
DT (șC)
Quenching
750
Thermal Conductivity
W/m-K @ R.T.
ASTM C408
27
Coefficient of Linear Thermal Expansion, al
mm/m-șC (~25șC through ±1000șC)
ASTM C372
3.4
Specific Heat, cp
cal/g-șC @ R.T.
ASTM C351
0.17
Electrical
Dielectric Constant
1MHz @ R.T.
ASTM D150
7.0
Dielectric Strength
kV/mm
ASTM D116
17.7
Electrical Resistivity
Wcm @ R.T.
ASTM D1829
1013
 
 
*Although we have no reason to doubt the accuracy of the data presented, Ferro-Ceramic Grinding Inc. offers this information for comparison only, and disclaims any and all liability from error, omissions or inaccuracies, such that it does not constitute a warranty or representation for which we shall assume legal responsibility.