Metal-Polymer Bronze Backed PTFE Plain Bearings are engineered for demanding applications requiring durability, low friction, and corrosion resistance. Their two-layer construction combines the mechanical strength of a metal backing (typically bronze or steel) with the self-lubricating properties of a PTFE-infused polymer layer. This design allows them to operate in both dry and lubricated environments while handling high loads. The choice of materials also provides flexibility for specific environmental conditions, such as exposure to chemicals or moisture.
Key Points Explained:
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Bronze or Steel Backing Layer
- Provides structural integrity and load-bearing capacity
- Bronze offers natural corrosion resistance, while steel variants may use stainless steel for harsh environments
- Acts as a stable substrate for bonding with the polymer layer
- Thickness typically ranges from 1-5mm depending on load requirements
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Metal-Polymer Composite Layer
- Contains PTFE (Polytetrafluoroethylene) as the primary lubricating agent
- May include additional fillers like bronze powder or carbon for enhanced wear resistance
- Typical thickness of 0.1-0.5mm balances friction reduction with durability
- Self-lubricating properties eliminate need for frequent maintenance
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Material Synergy
- The metal backing absorbs mechanical stresses while the polymer layer reduces friction
- Thermal expansion coefficients are carefully matched to prevent delamination
- Some designs incorporate intermediate bonding layers for improved adhesion
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Performance Characteristics
- PV (Pressure-Velocity) values typically range 50,000-300,000 psi·fpm
- Static load capacity up to 100,000 psi in some configurations
- Operating temperature range: -200°C to +280°C (-328°F to +536°F)
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Design Variations
- Backing material selection (bronze vs. steel) depends on corrosion needs
- Polymer layer composition can be customized with different PTFE percentages
- Some versions include dimpled or grooved surfaces for lubricant retention
For purchasers, understanding these components helps in selecting bearings for specific operating conditions. The bronze-backed versions are particularly popular in marine and chemical processing applications, while steel-backed variants often appear in heavy machinery. The polymer layer composition should be matched to the expected load cycles and environmental exposure.
Summary Table:
| Component | Function | Key Specifications |
|---|---|---|
| Bronze/Steel Backing | Provides structural integrity and load-bearing capacity | Thickness: 1-5mm; Corrosion-resistant (bronze/stainless steel) |
| PTFE-Polymer Layer | Self-lubricating, reduces friction, and enhances wear resistance | Thickness: 0.1-0.5mm; May include fillers (bronze powder, carbon) |
| Material Synergy | Combines metal strength with polymer lubrication | Matched thermal expansion coefficients; Optional bonding layers for adhesion |
| Performance | High load capacity, wide temperature range, low maintenance | PV: 50,000–300,000 psi·fpm; Static load: ≤100,000 psi; Temp range: -200°C to +280°C |
| Design Variations | Customizable for corrosion resistance, lubricant retention, or load cycles | Dimpled/grooved surfaces; Bronze (marine/chemical) or steel (heavy machinery) backing |
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