Silicon Nitride Sleeves and Bushings
Silicon Nitride Ceramic Component
SKU: FWM/SN-SLEEVE-001
- Material
- Silicon Nitride (Si₃N₄) – High-density / Gas Pressure Sintered
- Size
- Custom sizes available
- MOQ
- 5 pieces per type
- Applications
- Pumps & Compressors
Silicon Nitride Sleeves (also known as Si₃N₄ bushings or shaft sleeves) are high-performance precision ceramic components designed for extreme wear, corrosion, high-temperature and high-speed environments.
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Product Description
Silicon nitride sleeves and bushings provide shaft protection, sliding-bearing surfaces or electrically insulating interfaces in machinery.
The sleeve fits around a shaft or within a housing to create the required protective or sliding interface. Silicon nitride's wear resistance, strength and thermal shock resistance are useful in rotating assemblies and equipment subject to temperature changes.
A protective sleeve shields a shaft, a loaded bushing supports sliding contact, and an insulating sleeve separates electrical interfaces. These functions use different working surfaces even when the outside shape is similar.
Product Features
- Hard surfaces for wear-resistant contact
- Strength and fracture toughness for mechanical duties
- Thermal shock resistance during temperature changes
- Low thermal expansion for dimensional stability
- Electrical insulation where an insulating interface is required
Typical Applications
- Shaft sleeves and bushings in pumps and rotating equipment
- Protective sleeves in thermally cycled machinery
- Sliding-bearing and insulating interfaces
- Precision guides and sleeve components in industrial assemblies
95% Si₃N₄ Typical Properties
| Property | 95% Si₃N₄ | Condition / method |
|---|---|---|
| Density (g/cm³) | ≥3.2 | — |
| Young’s modulus (GPa) | 300 | — |
| Fracture toughness (MPa·m½) | 6.2 | — |
| Flexural strength (MPa) | >720 | 25°C |
| Compressive strength (MPa) | 2200 | 25°C |
| Thermal conductivity (W/(m·K)) | 15–20 | 25°C |
| Coefficient of thermal expansion (10⁻⁶/K) | 3.0–3.2 | 25–1000°C |
| Volume resistivity (Ω·cm) | >10¹⁴ | 25°C |
| Typical maximum material temperature (°C) | 1200 | — |
| Poisson’s ratio | 0.26 | — |
| Dielectric strength (kV/mm) | 16 | — |
| Relative permittivity | 8.2 | 1 MHz; 25°C |
| Dielectric loss tangent | 0.004 | 1 GHz; 25°C |
Available Forms
Representative forms are shown for selection. Send drawing, dimensions, tolerances, surface finish requirements and quantity for feasibility review and quotation.
- Straight sleeves, flanged sleeves, stepped sleeves
- Custom inner/outer diameter, length and wall thickness
- Precision ground and polished surfaces
Packaging & Shipping
Packing and shipment arrangements are selected for the confirmed component geometry and order requirements.
| Item | Details |
|---|---|
| Packaging & shipping | Individually protected, cushioned and packed in export cartons or wooden cases according to size and quantity. Other commercial terms are confirmed in the quotation. |
| Payment terms | T/T / Western Union / PayPal; 50% advance payment, 50% balance before shipment |
| Shipping methods | Sea freight / Air freight / Door-to-door courier |
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