Product Details
Si₃N₄ Outer Spherical Bearing
Parameter characteristics
Product Details
Si₃N₄ Outer Spherical BearingDimensional Table
|
Bearing Model |
Overall Dimensions(mm) |
Mounting Dimensions(mm) |
Weight (kg) (Ref.) |
|||||||||
|
d |
D |
B |
r（Min） |
da（Min） |
da（Max） |
Da（Max） |
ra（Max） |
ZrO₂ |
Si₃N₄ |
plastic |
SUS |
|
|
UC207 |
35 |
72 |
42.9 |
/ |
/ |
/ |
/ |
0.4 |
0.21 |
/ |
0.52 |
|
Silicon nitride bearings are high-performance bearings using silicon nitride ceramic (Si₃N₄) as the core material. Due to their outstanding comprehensive properties, they have become a superior alternative to traditional steel bearings in advanced industrial applications.
The following is a comprehensive technical analysis:
Ⅰ、Six Core Advantages
1. Extreme Environment Adaptability
o High-Temperature Resistance: Long-term use at 800°C, short-term up to 1200°C (steel bearings ≤300°C).
o Corrosion Resistance: Resistant to strong acids (except HF), alkalis, and seawater.
o Vacuum Compatibility: No outgassing contamination, suitable for ultra-high vacuum (10⁻⁶ Pa).
2. Breakthrough Physical Properties
| Parameter | Value |
vs. Steel Bearings |
|
密度 |
3.2 g/cm³ |
60% lighter |
|
Density |
1500-1700 HV |
2× harder |
|
Elastic Modulus |
310 GPa |
Higher rigidity, lower deformation |
|
CTE |
3.2×10⁻⁶/℃ |
Matches cast iron/Ni-based alloys |
3. Kinematic Performance Optimization
o 50% higher speed limit (due to low density and reduced centrifugal force).
o Friction coefficient 0.05-0.1 (excellent self-lubrication).
o 70% lower vibration (superior material homogeneity vs. steel).
4. Special Functional Properties
o Insulation resistance >10¹⁴ Ω·cm (eliminates electrical erosion).
o Non-magnetic (ideal for MRI and precision instruments).
o Biocompatibility (certified for medical implants).
Ⅱ、典型应用场景与选型指南
| Industry | Application | Recommended Type | Key Requirements |
|---|---|---|---|
| Semiconductor | Vacuum manipulators, lithography wafer stages | Full-ceramic bearings (ABEC9/P2 grade) | No metal contamination, ultra-precision |
| New Energy | Fuel cell compressors, wind turbine spindles | Hybrid bearings (Si₃N₄ balls + steel rings) | Wet hydrogen resistance, long lifespan |
| Medical Devices | Dental handpiece bearings, surgical robot joints | Sterilizable full-ceramic bearings | FDA-certified, bio-inertness |
| Chemical Processing | Concentrated sulfuric acid pumps, chlor-alkali electrolyzers | Full-complement cage-free design | Corrosion resistance, zero maintenance |
| Aerospace | Satellite flywheels, aero-engine auxiliaries | Special-lubricated ceramic bearings | Operational range: -60~800°C |
Ⅲ、Advanced Manufacturing Processes
1. Powder Metallurgy Methods
o Hot Isostatic Pressing (HIP): Highest performance, relative density >99.5%.
o Gas Pressure Sintering (GPS): Cost-effective for mass production.
o Reaction Bonding: High dimensional accuracy but lower strength.
2. 精密加工技术Precision Machining
o Raceway Machining: Diamond wheel grinding, roundness ≤0.1μm.
o Surface Treatment: Laser polishing, Ra≤0.01μm (medical grade).
Ⅳ、Operation & Maintenance
1. Installation Guidelines
o Thermal Expansion Assembly: Heat housing to 150-200°C (avoid hammering).
o Alignment Tolerance: Angular deviation ≤0.5° (more sensitive than steel bearings).
2. Lubrication Solutions
o Dry Running: PTFE cage self-lubrication (<50N/mm² load).
o Special Lubricants: Perfluoropolyether (PFPE) grease (high-temperature).
o Water Lubrication: Medical/food-grade applications.
3. Failure Prevention
o Avoid Overload Impact (brittle material characteristic).
o Prevent Thermal Shock (heating rate <100°C/min).
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