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Classification of Bearing Materials and Analysis of Performance Requirements

 

As key components in mechanical operations, bearings' material selection directly affects their performance. Different fields use different bearing materials. The following is a detailed analysis of the classification and performance requirements of commonly used bearing materials.

 

1. Metallic Materials

Bearing Alloys: Including tin-based and lead-based alloys, they have excellent overall performance and are suitable for high-load conditions, but are relatively expensive.

Copper Alloys: Including tin bronze, aluminum bronze, and leaded bronze, they are suitable for working environments under different speed and load conditions.

Cast Iron: Suitable for light-load, low-speed conditions.

 

2. Porous Metal Materials

These materials are made by sintering different metal powders and have self-lubricating properties. They are suitable for smooth, non-impact loads and medium to low-speed conditions.

 

3. Non-Metallic Materials

Mainly including plastics, rubber, and nylon, these materials have low friction coefficients, wear resistance, and corrosion resistance, but their load-bearing capacity is relatively low and they are prone to thermal deformation.

 

Performance Requirements of Bearing Materials:

Friction Compatibility: Prevents adhesion and boundary lubrication issues, influenced by multiple factors, including composition, lubricants, and microstructure.

Embedability: Prevents hard particles from embedding and causing scratches or wear.

Run-in Properties: Reduces friction and wear rates by minimizing machining errors and surface roughness parameters.

Friction Compliance: Elastic-plastic deformation of the material can compensate for initial misfit and shaft deflection.

Wear Resistance: The ability to resist wear.

Fatigue Resistance: The ability to resist fatigue failure under cyclic loads.

Corrosion Resistance: The ability to resist corrosion.

Cavitation Resistance: The ability to resist cavitation wear.

Compressive Strength: The ability to withstand unidirectional loads without deformation.

Dimensional Stability: The ability to maintain dimensional accuracy during long-term use.

Rust Resistance: Good anti-rust performance.

Processing Performance: Adaptability to multiple hot and cold processing procedures, including formability, machinability, and heat treatment performance.

The above provides a comprehensive analysis of the classification of commonly used bearing materials and the performance requirements they should possess.