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Bearings of different materials

From:SINO BEARINGS2022-10-13
Bearings of different materials
Bearing alloy
Bearing alloy (Babbitt alloy) is widely used. They are usually of two types: tin-based bearing alloys and lead-based bearing alloys, which have the characteristics of fast running, easy to make the surface very smooth, and they are usually attached to the steel bearing bush matrix as bearing liners. Babbitt bearing has a good adaptability, for small misaligned or defective shaft has the characteristics of automatic regulation. Because the amount of dust or external debris into the lubricant can be absorbed by this soft material to prevent the shaft from gluing damage, this embedment makes them excellent bearing materials. The journal material may be mild steel, hard steel or cast iron.
Bronze BEARINGS ARE SUITABLE FOR LOW speed and HEAVY LOAD SITUATIONS WHERE shaft and bearing alignment is neutral, and can be made of a variety of alloy components to obtain a variety of physical properties.
Lead and copper
The bearing capacity of this bearing is higher than that of bearing alloy, and its adaptability is poor, so it is used for occasions with good shaft rigidity and good neutrality.
Cast iron
Cast iron bearing materials are widely used in less strict requirements. The hardness of the journal must be higher than that of the bearing bush. The working surface should be carefully fitted with a mixture of graphite and oil. It is required that the journal must be well aligned with the bearing.
Porous bearings
So-called "self-lubricating" or "porous" bearings can be made by first sintering metal powders and then dipping them in oil. Bronze of various components is widely used in porous bearings, while iron is less commonly used. Since porous bearings have self-lubricating properties, they are mainly used when it is difficult or impossible to obtain reliable lubrication of bearings when general lubrication methods are used.
Carbon and plastic
In high temperature occasions, or when the traditional lubrication method can not be used, pure carbon bearings can achieve satisfactory results. Teflon is a very common plastic. The bearing made of it has a very low coefficient of friction, and used in oil-free lubrication, it can work at low speed or intermittent swing and heavy duty conditions. Experiments have shown that some combinations of materials work well together and some do not. Combinations of materials that do not work well together will cause excessive wear and tear.