CuSn12 Tin Bronze Alloy Bearing Bushing
CuSn12Ni2 is a tin bronze alloy known for its excellent mechanical properties, corrosion resistance, and suitability for heavy-duty applications. Below is a detailed summary of its chemical composition, mechanical properties, and physical properties based on the provided data:
Chemical Composition
| Element | % Min | % Max |
|---|---|---|
| Cu | 84.5 | 87.5 |
| Sn | 11.0 | 13.0 |
| Pb | – | 0.3 |
| Zn | – | 0.4 |
| P | 0.05 | 0.40 |
| Fe | – | 0.2 |
| Ni | 1.5 | 2.5 |
| Sb | – | 0.1 |
| S | – | 0.05 |
| Al | – | 0.01 |
| Mn | – | 0.2 |
| Si | – | 0.01 |
Mechanical Properties (Minimum Values)
| Property | Continuous (GC) | Centrifugal (GZ) |
|---|---|---|
| Tensile Strength (Rm, MPa) | 300 | 300 |
| Yield Point 0.2% (Rp0.2, MPa) | 180 | 180 |
| Elongation 5D (A, %) | 10 | 8 |
| Hardness (HBW, 10-1000) | 95 | 95 |
Physical Properties
| Property | Value |
|---|---|
| Density (kg/dm³) | 8.6 |
| Specific Heat (J/(g·K)) | 0.376 |
| Thermal Expansion (10⁻⁶/K) | 18.5 |
| Thermal Conductivity (W/(m·K)) | 54 |
| Electrical Conductivity (MS/m) | 6.2 |
Key Characteristics and Applications
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Hardness and Corrosion Resistance: The addition of nickel (1.5–2.5%) enhances hardness and corrosion resistance, making it suitable for demanding environments.
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Applications:
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Gearboxes and toothed gearings
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Bearings for heavy loads and relatively slow speeds
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Moulding Processes: Suitable for continuous (GC) and centrifugal (GZ) casting methods.
This alloy is ideal for applications requiring a combination of strength, wear resistance, and durability under heavy loads.
CuSn12ni tin Bronze Bearings
Composition:
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Copper (Cu): The base metal, providing good thermal and electrical conductivity.
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Tin (Sn): Typically around 12%, which enhances strength, hardness, and wear resistance.
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Nickel (Ni): Added to improve corrosion resistance, mechanical properties, and thermal stability.
Key Properties:
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High Strength: Suitable for heavy-load applications.
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Excellent Wear Resistance: Ideal for bearings and bushings that experience friction.
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Good Corrosion Resistance: Performs well in harsh environments, including exposure to seawater and chemicals.
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Low Friction Coefficient: Reduces wear and energy loss in moving parts.
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Thermal Conductivity: Helps dissipate heat generated during operation.
Applications:
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Bearings and Bushings: Widely used in marine, automotive, and industrial machinery.
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Gears and Worm Wheels: Due to its durability and low friction.
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Pump Components: Such as impellers and valves, where corrosion resistance is critical.
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Marine Applications: Propeller shafts, rudder bearings, and other components exposed to seawater.
Advantages:
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Long service life even under high loads and harsh conditions.
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Reduced maintenance requirements due to its self-lubricating properties (when combined with graphite or other additives).
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Suitable for both high-speed and low-speed applications.
Manufacturing Processes:
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Casting: Commonly used to produce complex shapes.
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Machining: Can be machined to precise tolerances.
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Sintering: Used for powder metallurgy applications.
Considerations:
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Cost: Higher than some other bearing materials due to the tin and nickel content.
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Weight: Heavier than aluminum or plastic bearings, which may be a factor in some applications.
CuSn12Ni tin bronze bearings are a reliable choice for demanding applications where performance and durability are critical.
