Silicon nitride sealing spin ring
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材料及含量
产品特点
1. High Pressure Resistance: Can withstand alternating loads exceeding 50 MPa, suitable for high-pressure pumps, valves, and other equipment.
2. High Temperature Resistance: Maintains stable physical and chemical properties even at temperatures up to 1200°C.
3. Chemical Inertness: Exhibits strong resistance to strong acids (except hydrofluoric acid), strong bases, and various corrosive media.
4. Self-Lubricating: A silicon dioxide lubricating film can form on the surface, enabling low-wear operation without external lubrication.
5. High Mechanical Strength: Bending strength reaches 600-800 MPa, and fracture toughness is >6.0 MPa·m¹/².
产品详情
Product Introduction of Silicon Nitride Sealing Swivel Rings
High-pressure resistant silicon nitride sealing swivel rings are high-performance ceramic sealing components made from silicon nitride (Si₃N₄) material, possessing excellent wear resistance, high-temperature resistance, and chemical corrosion resistance. This product is manufactured using a vacuum hot-pressing sintering process, followed by precision grinding and polishing to ensure a high-precision sealing surface.
Technical Parameters
Temperature resistance range: 1200℃ in air / 1400℃ in protective atmosphere.
Vickers hardness: ≥1600 HV.
Bending strength: 600-800 MPa.
Coefficient of friction: 0.02-0.1.
Thermal expansion coefficient: 3.0×10⁻⁶/℃.
Pressure resistance: ≥50 MPa.
Manufacturing Process
1. Raw Material Preparation: High-purity silicon nitride powder (purity >99.9%) is used.
2. Hot Press Sintering: Sintering is performed at 1600-1800℃ and a pressure of over 30 MPa.
3. Precision Machining: Diamond grinding technology is used, with dimensional accuracy controlled within ±0.005mm.
4. Surface Treatment: Surface roughness Ra ≤ 0.2μm.
Product Features
1. Service life is 3-5 times longer than traditional metal materials.
2. Can operate continuously for 5 years without leakage under extreme working conditions (such as temperature fluctuations of 200-800℃ + 65% nitric acid vapor).
3. Extends equipment maintenance cycles from 3 months to 3 years (taking hydrogen fuel cells as an example).
4. Reduces equipment operating resistance and improves working efficiency.
Application Fields
1. Mechanical Seals: Shaft seals for rotating equipment such as pumps, compressors, and mixers.
2. Semiconductor Equipment: Key components such as vacuum pumps and reactors.
3. Chemical and Petrochemical Industry: Seals for systems transporting highly corrosive media.
4. Aerospace: Engine guide bushings and combustion chamber components.
5. New Energy: Bipolar plate seals for hydrogen fuel cells.
6. Automotive Industry: Turbocharger rotors and battery production lines.
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