Silicon Nitride Ceramic Parts

High-hardness technical ceramic for wear resistance,

electrical insulation, and high-temperature applications.

What is Silicon Nitride Ceramic?

Silicon nitride ceramic (Si₃N₄) is an advanced engineering ceramic known for its exceptional strength, high fracture toughness, and outstanding thermal shock resistance.

Compared with many traditional ceramics, silicon nitride offers superior resistance to mechanical stress, temperature fluctuations, and wear, making it one of the most reliable structural ceramics for demanding industrial applications.

Silicon nitride ceramics are widely used in automotive engineering, aerospace, mechanical systems, semiconductor equipment, and high-temperature industrial environments, where durability and reliability are critical.

Key Features of Silicon Nitride Ceramic

Exceptional Mechanical Strength
Silicon nitride ceramics exhibit very high strength and structural reliability even under heavy mechanical loads.
Outstanding Thermal Shock Resistance
Its low thermal expansion and high toughness allow silicon nitride to withstand rapid temperature changes without cracking.
High Wear Resistance
The material’s high hardness makes it ideal for wear-resistant components operating in harsh environments.
Excellent High-Temperature Stability
Silicon nitride maintains strong mechanical properties at elevated temperatures, making it suitable for high-temperature applications.
Low Density with High Strength
Compared with many engineering materials, silicon nitride offers an excellent strength-to-weight ratio.
Good Chemical and Corrosion Resistance
Silicon nitride ceramics resist oxidation and chemical attack in many industrial environments.

Technical Properties of Silicon Nitride Ceramic

The following table summarizes the typical physical, mechanical, thermal, and electrical properties of silicon nitride ceramic (Si₃N₄). These values are provided for reference and may vary depending on material grade, manufacturing process, and application conditions.

Property	Unit	Typical Value	Notes
Material Name	—	Silicon Nitride Ceramic	Si₃N₄ Ceramic
Material Type	—	Non-oxide ceramic	Advanced structural ceramic
Chemical Formula	—	Si₃N₄	Silicon nitride
Color	—	Dark gray / Black	Typical appearance
Crystal Structure	—	Hexagonal	β-Si₃N₄ phase
Porosity	%	<1	Dense sintered ceramic
Machinability	—	Limited	Requires diamond grinding

Property	Unit	Typical Value	Notes
Density	g/cm³	3.2 – 3.3	Typical value
Water Absorption	%	0	Dense material
Specific Heat	J/kg·K	~710	At 25 °C
Thermal Diffusivity	m²/s	~1.0 ×10⁻⁵	Typical value

Property	Unit	Typical Value	Notes
Young’s Modulus	GPa	300 – 320	Typical value
Shear Modulus	GPa	~125	Typical value
Poisson’s Ratio	—	0.27	Typical value
Vickers Hardness	HV	1500 – 1700	High hardness
Flexural Strength	MPa	800 – 1000	Very high strength
Compressive Strength	MPa	3000	Typical value
Fracture Toughness	MPa·m½	6 – 7	Excellent toughness

Property	Unit	Typical Value	Notes
Maximum Continuous Operating Temperature	°C	1200	In air
Maximum Short-Term Temperature	°C	1400	Short exposure
Thermal Conductivity	W/m·K	20 – 30	Typical value
CTE (25–1000 °C)	×10⁻⁶ /°C	3.2	Very low expansion
Decomposition Temperature	°C	~1900	In inert atmosphere

Property	Unit	Typical Value	Notes
Dielectric Constant (1 MHz)	—	7.5 – 8.5	Typical value
Loss Tangent	—	~0.0004	Low dielectric loss
Dielectric Strength	kV/mm	15 – 20	Typical value
Volume Resistivity	ohm·cm	≥10¹⁴	At room temperature
Electrical Insulation	—	Excellent	High resistivity

*All values shown are typical material properties and are provided for reference only. Actual values may vary depending on material grade, manufacturing process, and testing conditions.