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Sliding bearings are an essential part of many mechanical systems, providing support and reducing friction between moving parts. These bearings can be made from a variety of materials, each with its own advantages and applications.
1) **Metal Materials**: Commonly used metals include bearing alloys, bronze, aluminum-based alloys, and zinc-based alloys. These materials offer good wear resistance, high plasticity, and excellent running-in properties. They also have good thermal conductivity and oil absorption capabilities, making them ideal for heavy-load and high-speed applications.
2) **Porous Metal Materials**: Also known as powder metallurgy materials, these are characterized by their porous structure. When immersed in lubricating oil, the pores absorb the oil, creating an oil-impregnated bearing that provides self-lubrication. This makes them suitable for applications where regular maintenance is difficult or impractical.
3) **Non-Metallic Materials**: These include plastics such as phenolic resin, nylon, and PTFE (polytetrafluoroethylene). Plastic bearings are known for their high compressive strength, good wear resistance, and ability to operate smoothly with both oil and water. They also have self-lubricating properties, although they generally have poor thermal conductivity compared to metal bearings.
Bearing alloys, often referred to as white alloys, are typically composed of tin, lead, antimony, or other metals. Their superior performance in terms of wear resistance, flexibility, and lubrication makes them widely used in industrial machinery. However, the strength of these alloys may vary depending on the specific composition and manufacturing process.
Porous metal materials, while effective in certain applications, require careful consideration of their oil retention capacity and long-term stability under different operating conditions. Proper selection and maintenance are crucial to ensure optimal performance.
Plastic bearings are increasingly popular due to their lightweight, corrosion resistance, and cost-effectiveness. They are commonly used in low-to-medium load applications where noise reduction and vibration damping are important.
In addition to material selection, proper installation, lubrication, and maintenance play a critical role in extending the life of sliding bearings. Understanding the working environment and operational requirements is key to choosing the right type of bearing for any given application.
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This article was originally published on China Bearing Network. For more information, visit [China Bearing Network](http://www.chinabearing.net).
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Sliding bearing information
Source: China Bearing Network | Date: June 3, 2013