Silicon Nitride (Si3N4) Properties for Machining

Silicon nitrides (Si3N4) advanced ceramic materials are characterized by their high strength, toughness and hardness combined with chemical and thermal stability.

Silicon Nitride (Si3N4) Properties For Machining

Insaco typically works with a Hot Pressed form of Silicon Nitride.

Chemical Formula of Silicon Nitride

The chemical formula of Silicon Nitride is given in the table below:

Property Value*
Chemical Formula Si3N4

* All properties are at room temperature unless otherwise noted.

Mechanical Properties of Silicon Nitride

The mechanical properties of Silicon Nitride are mentioned in the table below:

Property Value*
Density 3.2-3.31 gm/cc
Hardness 1500-2000 Knoop
Tensile Strength 85 kpsi
Modulus of Elasticity 45-49 x 106 psi
Flexural Strength 65-132 kpsi
Compressive Strength >435-500 kpsi
Poisson's Ratio 0.27
Fracture Toughness 4-6 MPa m1/2

* All properties are at room temperature unless otherwise noted.

Electrical Properties of Silicon Nitride

The electrical properties of Silicon Nitride are mentioned in the table below:

Property Value*
Dielectric Strength 17700 ac V/mm
Dielectric Constant 8.4(@ 1 MHz)
Volume Resistivity >1013 ohm-cm

* All properties are at room temperature unless otherwise noted.

Thermal Properties of Silicon Nitride

The thermal properties of Silicon Nitride are mentioned in the table below:

Property Value*
Coefficient of Thermal Expansion 3.0-3.9 x 10-6/°C
Thermal Conductivity 15-30 W/mK
Specific Heat 0.13 cal/g°C
Maximum Working Temperature 1200°C
Shock Resistance 750°C Diff.

* All properties are at room temperature unless otherwise noted.

This information has been sourced, reviewed and adapted from materials provided by INSACO Inc.

For more information on this source, please visit INSACO Inc.

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