Silicon Nitride Ceramics

Silicon nitride is known as one of the hardest substances in the world. It is famous for its excellent mechanical strength, thermal stability and low density. It is an inorganic ceramic material that does not shrink during sintering. It can maintain reliability in extreme environments and is widely used in applications such as semiconductors, automobiles, and industrial machinery.

Machining Capability

Silicon Nitride is an extremely hard ceramic material that is difficult to machine and prone to edge chipping. With our advanced machining capabilities, we provide high-precision, complex Silicon Nitride ceramic components to meet the demanding requirements of your applications.

Tolerance ±1um

Flatness 1 µm (Φ300)

Micropores 0.3mm

Roughness Ra0.005μm

Internal Thread M2.0

Max. Size 400*400mm

Advantages

High strength and stiffness even at elevated temperatures
Superior thermal shock resistance compared to alumina and zirconia
Excellent wear and corrosion resistance.
Lightweight with high fracture toughness
Electrical insulation with good thermal conductivity
Outstanding performance under high-speed and high-load conditions

Properties

The table below lists the material properties of our aluminum nitride ceramics. These parameters are for reference only, and slight differences may exist between different batches of products.

Mechanical Properties	Unit	Silicon Nitride
Density	g/cm³	3.2
Hardness	GPa	15
Flexural Strength	MPa	1000
Compressive Strength	MPa	3000
Elastic Modulus	GPa	320
Fracture Toughness	MPa·m^1/2	8
Poisson's Ratio	—	0.26
Young's Modulus	GPa	320

Thermal Properties	Unit	Silicon Nitride
Thermal Conductivity	W/m·K	25
Melting Point	°C	1900
Specific Heat	J/g·K	0.71
Coefficient of Thermal Expansion	×10⁻⁶/K	3.2
Maximum Operating Temperature	°C	1400

Thermal Properties	Unit	Silicon Nitride
Thermal Conductivity	W/m·K	25
Melting Point	°C	1900
Specific Heat	J/g·K	0.71
Coefficient of Thermal Expansion	×10⁻⁶/K	3.2
Maximum Operating Temperature	°C	1400

Interested in Our Si₃N₄ Ceramic Solutions?

Download Our Datasheet

Applications

Wafer handling components, heater bases
Bearings, turbine components
Engine components, turbocharger rotors
Pump seals, precision bearings
High-temperature structural components

FAQS

How is the fracture toughness of silicon nitride ceramics?

Silicon Nitride (Si₃N₄) has very high fracture toughness, second only to zirconia among common engineering ceramics.This makes it significantly more resistant to cracking and mechanical shock compared to materials like alumina or silicon carbide.

What is the minimum hole size and thread you can machine in Silicon Nitride (Si₃N₄)?

We can machine Silicon Nitride components with a minimum hole diameter of Ø0.3 mm and internal threads starting from M2.0. Due to the high hardness of the material, machining is challenging and requires precise process control to avoid chipping.

Do you support custom machining of silicon nitride ceramics?

Yes, we provide precision machining services for custom silicon nitride components based on your drawings and specifications.

Is silicon nitride suitable for high-speed or wear applications?

Yes, due to its low friction coefficient and high wear resistance, it is widely used in bearings and rotating components.

Macor is a machinable glass-ceramic made from fluorophlogopite mica crystals embedded in a borosilicate glass matrix. This composition gives it a rare
combination of metal-like machinability, excellent electrical insulation, low thermal conductivity, and stability up to 1000°C (no load) while maintaining very tight tolerances.