Vickers hardness: 14-16 GPa.
Flexural strength: 600-800 MPa.
Fracture toughness: 3-7 MPa·m¹/².
Thermal conductivity: 20-25 W/(m·K).
Coefficient of thermal expansion: 2.5-3.5×10⁻⁶/℃ (room temperature - 1000℃).
Maximum operating temperature: 1400℃ (protective atmosphere).
Product Introduction of Silicon Nitride Ceramic Rings
High-hardness silicon nitride ceramic rings (Si₃N₄) are high-performance engineering ceramic products with the following significant characteristics:
1. High hardness: Vickers hardness reaches 14-16 GPa, and Mohs hardness is above 9, second only to diamond.
2. High-temperature stability: It can still maintain a hardness of 8-10 GPa at a high temperature of 1200℃, and the oxidation rate is extremely low below 1400℃.
3. Excellent wear resistance: Friction coefficient is 0.02-0.1, and wear rate is 0.5-1.0×10⁻⁶ mm³/Nm.
4. Chemical inertness: It has extremely strong resistance to acids, bases, molten metals, and high-temperature gases (except hydrofluoric acid and concentrated strong alkalis).
5. Self-lubricating properties: A SiO₂ passivation film can be formed on the surface, reducing the friction coefficient.
Application Fields
1. Aerospace: Engine components, combustion chamber linings, radar radomes.
2. New Energy Vehicles: Battery system seals, motor drive components.
3. Mechanical Processing: Bearing rings, sealing rings, wear-resistant bushings.
4. Electronics and Electrical Engineering: Insulating components, circuit board substrates.
5. Chemical Equipment: Corrosion-resistant seals, reactor linings.
Supports custom specifications.
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