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TIMKEN Bearing Materials Should Have The Following Properties
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12/07/2024The property of preventing adhesion and boundary lubrication when the shaft and the bearing are in direct contact. The material factors that affect the friction compatibility of the friction pair are: (1) The metallurgical difficulty of the pair materials to form an alloy. (2) The affinity between the material and the lubricant. (3) The friction coefficient of the pair materials in the unlubricated state. (4) The microstructure of the material. (5) The thermal conductivity of the material. (6) The size of the material surface energy and the characteristics of the oxide film.
- Friction compatibility
The property of preventing adhesion and boundary lubrication when the shaft and the bearing are in direct contact. The material factors that affect the friction compatibility of the friction pair are:
(1) The metallurgical difficulty of the pair materials to form an alloy.
(2) The affinity between the material and the lubricant.
(3) The friction coefficient of the pair materials in the unlubricated state.
(4) The microstructure of the material.
(5) The thermal conductivity of the material.
(6) The size of the material surface energy and the characteristics of the oxide film. - Embeddability
The ability of the material to allow foreign hard particles in the lubricant to clamp in and prevent scratches or (and) abrasive wear. For metal materials, those with low hardness and low elastic modulus have good embeddability, while non-metallic materials are not necessarily the same. For example, carbon graphite has a low elastic modulus but poor embeddability. Sliding bearings usually use softer materials and harder materials to form a friction amplitude, and generally use softer materials as bearings. - Running-in performance
During the running-in process of the shaft diameter and the bearing, the ability to reduce the machining error, coaxiality error, and surface roughness parameter value of the shaft diameter and the bearing to make the contact uniform, thereby reducing the friction and wear rate. - Friction compliance
The material relies on the elastic-plastic deformation of the surface layer to compensate for the initial poor fit of the sliding friction surface and the flexural performance of the shaft. Materials with low elastic modulus have better compliance. - Wear resistance
The ability of the paired materials to resist wear. Under specified wear conditions, the wear resistance is expressed by the reciprocal of the wear rate or wear degree and wear amount. - Fatigue resistance
The ability of the material to resist fatigue damage under cyclic loads. At the operating temperature, the strength, hardness, impact strength and uniformity of the bearing material are very important for fatigue resistance. Materials with good running-in and embedding properties usually have poor fatigue resistance. - Corrosion resistance
The ability of the material to resist corrosion. When the lubricating oil is used in the atmosphere, it will gradually oxidize and produce acidic substances. In addition, most lubricating oils also contain extreme pressure additives, which will corrode the bearing material. Therefore, the bearing material needs to be corrosion-resistant. - Cavitation resistance
When the bubbles in the liquid burst near the solid surface when the solid moves relative to the liquid, local impact high pressure or local high temperature will be generated, which will cause cavitation wear. The ability of a material to resist cavitation wear is called cavitation resistance. Generally, copper-lead alloys, tin-based bearing alloys, and aluminum-zinc-silicon alloys have better cavitation resistance. - Compressive strength
The ability to withstand unidirectional loads without being squeezed or changing size.