Sliding Bearing Information

Source: China Bearing Network | Date: June 3, 2013

Sliding bearings are essential components in mechanical systems, designed to support loads and reduce friction between moving parts. They are commonly used in applications where high load capacity, smooth operation, and durability are required. The materials used for sliding bearings can be broadly categorized into three main types: metallic materials, porous metals, and non-metallic materials. 1. **Metal Materials**: These include bearing alloys such as babbitt metal (white metal), bronze, aluminum-based alloys, and zinc-based alloys. Babbitt metal, for instance, is a soft alloy primarily composed of tin, lead, and antimony. It is known for its excellent wear resistance, high plasticity, good running-in properties, and superior thermal conductivity. Its ability to absorb oil and resist galling makes it ideal for heavy-duty and high-speed applications. However, the strength of babbitt metal is generally lower than that of other structural materials, so it is often used in conjunction with stronger backing materials. 2. **Porous Metal Materials**: These are typically made through powder metallurgy processes, creating a material with a network of tiny pores. When immersed in lubricating oil, the pores absorb and retain the oil, forming an oil-impregnated bearing that provides self-lubrication. This type of bearing is particularly useful in applications where regular maintenance is difficult or impossible. Porous metals offer good wear resistance and can operate smoothly without constant external lubrication. 3. **Non-Metallic Materials**: Commonly used non-metallic materials for bearings 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 function with both oil and water. They also provide self-lubrication, making them suitable for low-friction environments. However, they tend to have poor thermal conductivity, which limits their use in high-temperature applications. In addition to these materials, sliding bearings can be further classified based on design, application, and operating conditions. Understanding the material properties and selection criteria is crucial for ensuring optimal performance and longevity in mechanical systems.
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This article is sourced from [China Bearing Network](http://www.chinabearing.net). For more information, please visit the official website. Previous: Tapered Roller Bearings Next: Bimetal Bearings
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