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Silicon nitride ceramics

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

Machining capabilities

Silicon nitride is an extremely hard ceramic material, making it difficult to process and prone to edge chipping. Leveraging our advanced processing capabilities, we can provide high-precision, highly complex silicon nitride ceramic components to meet the stringent requirements of your applications.

Tolerance ±1μm

Flatness 1μm (Φ300)

Micropores 0.3mm

Roughness Ra0.005μm

Internal Thread M2.0

Max. Size 400*400mm

Advantages

It has high strength and high rigidity even at high temperatures.
Excellent thermal shock resistance
Excellent wear resistance and corrosion resistance.
Lightweight and with high fracture toughness
Electrical insulation materials with good thermal conductivity
It performs excellently 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

Property	Unit	Silicon Nitride
Dielectric Constant	1 MHz	8
Dielectric Strength	V/µm	>10
Dielectric Loss	1 MHz	0.001
Electrical Resistivity	Ω·cm	10¹⁴

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Application

Wafer processing components, heater base
Bearings and turbine components
Engine components, turbocharger rotor
Pump seals, precision bearings
High-temperature structural components

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Silicon carbide ceramics

Silicon carbide (SiC) ceramics possess extremely high hardness, thermal conductivity, and excellent wear resistance, corrosion resistance, and thermal shock resistance. They maintain stability even under extreme temperatures and harsh environments, making them ideal materials for high-performance applications such as semiconductor devices, aerospace components, and precision mechanical systems.

More information about silicon carbide ceramics

What is the fracture toughness of silicon nitride ceramics?

Silicon nitride (Si₃N₄) has very high fracture toughness, second only to zirconium oxide among common engineering ceramics. This makes it more resistant to cracking and mechanical impact than materials such as alumina or silicon carbide.

What is the minimum hole size and thread size that can be machined 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 offer custom processing services for 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-resistant 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.