Dayoo Advanced Ceramic Co.,Ltd
Dayoo Advanced Ceramic Co.,Ltd
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Industrial Silicon Nitride Ceramic Sleeve: High-Precision Shaft Bushings with Through-Hole & Slotted Design
Product Introduction
This product is an industrial ceramic sleeve manufactured from high-performance Silicon Nitride (Si3N4), designed for precision machinery applications in demanding operating conditions. It features a classic dark gray color and a fine matte texture, signifying its high density and superior quality. Structurally, it employs a cylindrical design with a precision-machined circular through-hole on the sleeve wall and a carefully engineered open slot on one side edge. The overall dimensions are regular, with smooth inner and outer walls free of burrs, ensuring easy installation and stable operation. This silicon nitride ceramic sleeve combines excellent mechanical properties with an intelligent structural design, making it an ideal choice for enhancing equipment reliability and service life.
Core Advantages
Exceptional Wear Resistance: High hardness and an extremely low coefficient of friction significantly reduce wear on both the sleeve and the matching shaft.
Outstanding High-Temperature Resistance: Maintains stable performance in environments up to 1200°C, without softening or oxidizing.
Superior Corrosion Resistance: Resists erosion from most acids, alkalis, and salt solutions, suitable for harsh environments like chemical processing and marine applications.
High Strength & Rigidity: Features top-ranking flexural strength and fracture toughness among ceramics, capable of withstanding high loads and impact.
Self-Lubricating Properties: Can operate without oil lubrication under certain conditions, simplifying system design for special requirements.
Lightweight: Significantly lower density than steel, helping to reduce inertia in rotating components for high-speed operation.
Typical Applications
Precision spindle bushings and bearings in high-speed CNC machines and machining centers
Mechanical seal rings and components in chemical pumps and corrosion-resistant pumps
Guide sleeves and positioning sleeves in automation equipment
Ceramic structural parts in semiconductor manufacturing equipment
Electrically insulating sleeves in automotive turbochargers
Specifications Table
| Parameter | Detailed Specification |
|---|---|
| Material | Reaction Bonded / Pressureless Sintered Silicon Nitride (Si3N4) |
| Color | Dark Gray |
| Density | ≥3.2 g/cm³ |
| Hardness | HRA 90-94 |
| Flexural Strength | ≥600 MPa |
| Fracture Toughness | ≥6.0 MPa·m¹/² |
| Max. Service Temperature | 1200 °C (in oxidizing atmosphere) |
| Coefficient of Thermal Expansion | 3.2 × 10⁻⁶/°C (20-1000°C) |
Manufacturing Process
Raw Material Formulation → Ball Milling & Mixing → Spray Drying → Dry Pressing / Isostatic Pressing → Precision Machining (CNC Grinding) → Reaction / Pressureless Sintering → Non-Destructive Testing → Fine Grinding & Polishing → Full-Dimensional Inspection → Packaging & Warehousing.
Usage Instructions
Pre-Installation Check: Ensure the inner/outer walls of the sleeve and the shaft surface are clean and free of contaminants before installation.
Utilize the Slot: The side slot allows for slight elastic deformation during installation for easy mounting onto the shaft.
Through-Hole Function: The circular through-hole can be connected to an external oil line for lubrication or used as a locating pinhole.
Fit Tolerance: This is a precision component. Ensure tolerances with mating parts are within the drawing specifications; press-fit or light press-fit is recommended.
Avoid Impact Force: Although silicon nitride has high strength, it is still a brittle material. Avoid direct hammering during installation.
After-Sales Service
We provide comprehensive technical support and after-sales service. The product warranty period is 12 months. We offer free repair or replacement for products with quality issues under normal use conditions. Lifetime technical consultation is available.
FAQ
Q: What is the biggest benefit of this ceramic sleeve compared to a metal sleeve?
A: The biggest advantages are its high-temperature resistance, corrosion resistance, and low friction coefficient. It can operate reliably long-term in harsh environments where metal sleeves would fail, resulting in a longer service life.
Q: Can the through-hole and slot be customized?
A: Yes. We support custom non-standard designs. The quantity, position, size of the through-holes, and the width/depth of the slot can be machined according to your drawings.
Q: How is its electrical insulation performance?
A: Silicon Nitride is an excellent electrical insulator with high volume resistivity, making it ideal for shaft bushings or sealing applications requiring electrical insulation.
