Silicon Nitride (Si3N4)
Silicon Nitride Ceramic is a high-performance ceramic material known for its outstanding mechanical strength, which remains stable up to temperatures of 1200°C. It also exhibits exceptional thermal shock resistance, making it ideal for applications that experience rapid temperature changes. With its low wear friction and excellent wear resistance, Silicon nitride ceramic is widely used in components that require high durability and long-lasting performance, such as bearings and bearing balls. Additionally, its self-lubricating properties help reduce friction and extend the lifespan of machinery.
Properties
High strength and fracture toughness over a wide temperature range
High hardness and excellent wear resistance
Low thermal expansion for excellent dimensional stability
Superior thermal shock resistance
Lightweight structure
Resistant to acids, alkalis, and oxidation
Non-wetting with molten aluminum, magnesium, and copper
Data Sheet
Item | Unit | Technical Parameter |
Purity | % | 95 |
Color | --- | Black |
Density | g/cm3 | ≥3.2 |
Water Absorption | % | 0 |
Hardness (HV) | Mpa | 1500 |
Young’s modulus | Gpa | 300 |
Fracture Toughness | Mpa.m1/2 | 6.2 |
Flexural Strength @25℃ | Mpa | >720 |
Compressive Strength @25℃ | Mpa | 2200 |
Thermal Conductivity@25℃ | W/mk | 15~20 |
Thermal Expansion Coefficient (25-1000℃) | 10-6/℃ | 3.0~3.2 |
Poisson Ratio | --- | 0.26 |
Max. Working Temperature | ℃ | 1200 |
Dielectric Strength | Kv/mm | 16 |
Electrical Resistivity @25℃ | Ω.cm | >1014 |
Dielectric Constant (@1MHz, 25℃) | --- | 8.2 |
Dielectric Loss (Tan Delta) (@1GHz, 25℃) | --- | 0.004 |
Applications
Bearing balls and rollers
Cutting tools for high-performance machining
Turbocharger rotors, exhaust valves, and glow plugs for high-performance engines
Thermal insulation supports and combustion chamber liners
Crucibles and components for molten metal handling
Welding jigs, fixtures, locating pins, and nozzles
Riser tubes, protective tubes, and rotors for aluminum processing
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