High Purity Alumina Ceramic 350 MPa Flexural Strength Customized

Product Introduction
Alumina ceramic bearing outer rings and sleeves are advanced ceramic mechanical components manufactured from high-purity (typically ≥99%) alumina (Al₂O₃) through precision processing. Designed specifically for extreme and harsh operating conditions, they deliver performance far surpassing that of traditional metal components. These products exhibit exceptional hardness, outstanding wear resistance, excellent electrical insulation, and superior corrosion resistance. They operate reliably in high-temperature, high-speed, highly corrosive, and electrically insulated environments, serving as critical components for achieving long service life, low maintenance, and high reliability in equipment.

Main Applications

• Semiconductor Manufacturing Equipment: Wafer handling robots, vacuum chamber guides, providing high cleanliness and insulation.

• Medical Equipment: Dental handpieces, high-speed centrifuges, MRI scanners, offering corrosion resistance and non-magnetic properties.

• Food and Chemical Pumps: Bearings for pumps handling corrosive media, resistant to acids and alkalis.

• High-Temperature Environments: Furnace conveyor rollers, high-temperature fans, maintaining stability and strength without deformation at elevated temperatures.

• Precision Instruments: High-precision measuring equipment, optical instruments, ensuring smooth operation and freedom from magnetic interference.

Product Advantages

• Exceptional Wear and Corrosion Resistance: Hardness ≥90 HRA, wear resistance is over 5 times that of bearing steel, resistant to acids, alkalis, and various solvents.

• Non-Magnetic and Insulating: Completely non-magnetic with high volume resistivity, suitable for strong magnetic fields and applications requiring electrical insulation.

• High and Low Temperature Resistance: Operates reliably within a wide temperature range of -100°C to 1000°C, with low thermal expansion coefficient and excellent dimensional stability.

• Low Density and Self-Lubricating: Density is only 40% that of steel, reducing centrifugal force during high-speed operation, and offering certain self-lubricating properties.

• Long Service Life and High Reliability: Significantly longer lifespan than metal bearings in harsh conditions, greatly reducing equipment downtime and maintenance costs.

Specification Table

Process Flow
Raw material formulation (high-purity alumina powder) → Spray granulation → Dry pressing/isostatic pressing → High-temperature sintering (1600-1800°C) → Precision grinding with diamond wheels → Ultra-precision CNC lapping → Ultrasonic cleaning → 100% full-dimensional and performance inspection → Laser marking and packaging.

Usage Instructions

1. Before Installation: Ensure the installation area is clean, free of oil, and burrs. Non-metallic installation tools (e.g., nylon hammer) are recommended.

2. During Installation: Use an interference fit. Apply pressure evenly and slowly. Avoid direct impact on ceramic parts to prevent brittle fracture.

3. Mating Recommendations: It is recommended to pair with zirconia or silicon nitride (Si₃N₄) ceramic balls. Avoid direct ceramic-to-ceramic pairing (Al₂O₃ vs. Al₂O₃) due to potential risks.

4. Lubrication: Can operate dry or use special lubricants like perfluoropolyether (PFPE) grease, depending on the application.

5. Routine Maintenance: Regularly check operating status for abnormal noise and vibration.

After-Sales Service

• 12-month quality warranty.

• Free technical selection and application consulting.

• Rapid response to customer inquiries with remote technical support.

• Custom non-standard services available based on customer drawings.

FAQ
Q: Can ceramic bearings completely replace steel bearings?
A: They cannot be directly replaced. Ceramic bearings are solutions for specific harsh conditions and are less economical than steel bearings in conventional environments. Thorough evaluation of the operating conditions is necessary before selection.

Q: Are alumina ceramic bearings impact-resistant?
A: No. Ceramic materials are hard but brittle. They should be protected from dropping and violent impact to avoid micro-cracks that are not easily detectable.

Q: What are the advantages of alumina ceramics compared to silicon nitride ceramics?
A: The main advantage of alumina ceramics is lower cost, with equally excellent corrosion resistance and insulation properties. However, they are slightly inferior to silicon nitride in terms of ultimate strength, toughness, and high-speed performance.