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 |
|
|
UC220 |
100 |
180 |
108 |
/ |
/ |
/ |
/ |
3.46 |
1.85 |
/ |
4.498 |
|
The Si3N4 outer spherical bearing is an advanced ceramic bearing engineered for exceptional performance under extreme conditions. Made from high-purity silicon nitride (Si₃N₄), this Si3N4 outer spherical bearing offers outstanding mechanical strength, thermal stability, and chemical resistance, making it a superior alternative to traditional steel bearings. The silicon nitride structure delivers a low density (around 3.2 g/cm³), resulting in roughly 60% less weight compared with steel bearings — this weight reduction lowers centrifugal force, enabling higher speed operation and reduced energy consumption.
In terms of performance, the Si3N4 outer spherical bearing features excellent wear resistance, a low friction coefficient (~0.05–0.1), and an optimized self-lubricating behavior, which prolongs service life. Its thermal expansion coefficient is minimal (~3.2×10⁻⁶ /°C), ensuring dimensional stability under wide temperature fluctuations. The bearing also exhibits extreme environment adaptability: it can operate at elevated temperatures (long-term up to ~800 °C, short-term up to ~1200 °C) and remains stable in corrosive or vacuum conditions. Moreover, it is electrically insulating (resistivity >10¹⁴ Ω·cm) and non-magnetic, which makes the Si3N4 outer spherical bearing ideal for sensitive applications such as MRI, vacuum equipment, and precision instruments.
In practical applications, the Si3N4 outer spherical bearing shines in high-speed spindles, semiconductor equipment, aerospace mechanisms, vacuum manipulators, and chemical processing systems. It accommodates angular misalignment thanks to its spherical outer ring design, reducing stress and extending bearing life even when mounted in less-than-perfect alignment.
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).
Keywords:
Product parameter manual
Keywords:
Online Inquiry
Leave your contact information to get a free product quote
Our Advantages
Why Choose Us
Our Capabilities
R&D Design: Scientific design analysis through CAE software. Machining: From raw materials to finished parts. Assembly and testing: Mechanized assembly system and performance testing.
Our Quality
Each component of Xuchang Jingong balanced suspension assembly is made of high-quality domestic raw materials and processed by high-quality and highly skilled employees of Xuchang Jingong.
Our Technology
The R&D center has established a functional positioning of "strengthening platform construction, cultivating core technologies; focusing on process optimization, serving production markets; focusing on user value, and leading market demand".
Our Service
Four service systems, professional cooperation and win-win, this is Jingong Machinery's commitment to customers. Professional, systematic, and comprehensive services are essential.