Long lifespan: Excellent wear resistance significantly extends service life and reduces replacement frequency.
Low maintenance costs: Self-lubricating properties reduce the need for lubricants, lowering operating costs.
Stable performance: Maintains dimensional and performance stability at both high and low temperatures.
Lightweight: Lower density than metal materials, suitable for weight-sensitive applications.
Silicon Nitride (Si3N4) Ceramic Piston Sleeve Product Introduction:
Silicon nitride (Si3N4) ceramic piston sleeves are high-performance engineering ceramic products with the following significant characteristics:
1. High Hardness and Wear Resistance: Vickers hardness of over 1800 HV (HRA 90+), Mohs hardness of 8-9, excellent wear resistance, with a wear rate only 1/10 of traditional metal materials.
2. High Temperature Resistance: Can operate stably in air up to 1200℃, and up to 1400℃ in a protective atmosphere, and can withstand drastic temperature changes without cracking.
3. Thermal Shock Resistance: Low thermal expansion coefficient (2.8-3.2×10⁻⁶/℃) and good thermal conductivity (20-30 W/m·K), capable of withstanding rapid temperature changes from 1000℃ to cold water.
4. Chemical Stability: Extremely resistant to most acids, bases, and molten metals (except hydrofluoric acid and concentrated strong bases).
5. Self-Lubricating Properties: Low surface friction coefficient (0.02-0.1), reducing energy loss and dependence on external lubricants.
Application Fields
Silicon nitride (Si3N4) ceramic piston sleeves are mainly used in the following fields:
1. Automotive industry: Engine piston sleeves, bearings, and other components, improving operating efficiency and durability.
2. Aerospace: High-temperature components in aircraft engines, withstanding extreme thermal environments.
3. Hydraulic/Pneumatic systems: Piston rods, sealing sleeves, etc., improving system reliability and response speed.
4. Chemical equipment: Corrosion-resistant valves and pipes, ensuring long-term stable operation in strong acid and alkali environments.
5. Mechanical engineering: High-speed machine tool bearings, wear-resistant components for heavy machinery.
Technical Parameters
Performance indicators | Reference values | Remark |
density | 3.1-3.3 g/cm³ | High degree of densification |
Flexural strength | 600-800 MPa | High mechanical strength |
fracture toughness | 5-7 MPa·m¹/² | Superior to most ceramic materials |
hardness | ≥1800 HV | Second only to silicon carbide and cubic boron nitride |
Thermal conductivity | 20-30 W/m·K | Excellent thermal management capabilities |
Operating temperature | In air, at temperatures ≤ 1200°C | In a protective atmosphere, at temperatures ≤1400℃ |
Supports custom specifications.
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