Technical Data
Silicon Nitride

Silicon Nitride image

Silicon nitride, mainly consisting of Si3N4, has excellent thermal shock resistance and high-temperature strength. These properties make it ideal for use in automotive engines and gas turbines. It is used for turbocharger rotors, glow plugs and hot plugs in diesel engines, and is being applied in many other diverse applications.

Related products for Silicon Nitride


Silicon nitride has high strength and fracture toughness at high temperatures.

It is used as a high-temperature structural component for automotive engines, gas turbines and combustor parts.

Silicon nitride has a low coefficient of thermal expansion and extremely high thermal shock resistance.


Dimensional precision achieved by machining

When dimensional precision is required for machined ceramics, Kyocera is capable of achieving the tolerances as shown in the table below. If greater tolerances are required, please consult us.

(Data are in mm unless otherwise specified)

1.Ground ceramic blocks and plates
Standard tolerance chart of round and square bars
2.Round and Square Bars
Standard tolerance chart of round and square bars


Ultra-precision is possible with Kyocera's unique techniques.

Precision machining is affected by shape and material.

Some practical examples are shown in the table below.

Machining accuracy chart of shape and material

* Surface roughness depends on the material. The data shown here indicates where alumina is used.



* The values are typical material properties and may vary according to products configuration and manufacturing process. For more details, Please feel free to contact us.

* 1: All values for apparent density and bulk density are the same, except for A482R which lists apparent density only.

Bulk density chart
Hardness chart
Flexural strength chart
Compressive strength chart
Young's modulus chart
Flexural strength vs. temperature chart
Thermal expansion chart
Thermal conductivity chart
Heat shock resistance chart
Chemical resistance chart (30 min  boiling)
Unit conversion table of stress & Unit conversion table of thermal conductivity