Part F & F bearing on the bearing, direct contact with the shaft and the shaft has to withstand loads relative motion, in order to reduce friction and wear on the bearing materials put forward various demands, in addition to the requirements of small friction coefficient of friction, wear-resistant outer should meet the following points.
    1. Should have sufficient compressive strength, fatigue strength and ability to withstand shocks, bearing alloy thickness (0.013-0.13) mm, when the thickness <0.36mm when the fatigue strength improved significantly.
    2. Blocking resistance: When the load, high speed, F & F bearing clearance is too small, the surface finish is not high, poor lubrication, pay attention carefully selected to match the material to prevent friction of a bonding adhesive wear.
    3. Adaptability and the ability to accommodate foreign bodies; low hardness, good ductility and elasticity of a material having a low coefficient of good adaptability and ability to hold foreign matter.
    4. Good corrosion resistance, low prices, sources foot; oil oxidation produces a gummy deposits, have a corrosive effect on the bearing materials.

A commonly used material
     Bearings and bearing liner materials commonly used metal materials and non-metallic materials into two categories.
    metal material:
    l. cast iron
       Ordinary gray cast iron, cast iron, ductile iron
       For low-speed light load, or open drive of F & F bearings
       Mechanism: material flake or spheroidal graphite component, covering the surface layer of lubricant graphite, ductile iron phosphate treatment after the performance, can form a thin layer of porous favorable improve wear resistance. .
    2. Bearing alloy
       Divided into two categories:
       ZChSnSb10-6 good corrosion resistance, strong anti-bonding capabilities, combined prison and steel back, expensive, for high-speed heavy load, such as rolling stock.
       ZChPbSb16-16-2 anti-bonding ability is poor, poor thermal expansion, brittle suitable for medium-speed contained.
       Sn, Pb as the matrix is ??quite soft, Sn-Sb, Sn-Cu form a solid solution hard, mixed in the soft substrate.
       This F & F babbitt good wear resistance, gluing, thermal conductivity, large, most suitable for making bearing materials.
    3. bronze
       ZCuPb30 by casting or sintering is attached to the inner surface of a pair of steel-backed bearing metal, excellent anti-bonding properties.
       ZCuSn10-l friction and wear resistance are very good, the best bearing materials, high-speed heavy
       ZcuSn5Pb5Zn5 fatigue strength of high, medium-speed heavy
       ZCuAl10Fe3 highest intensity, but poor adaptability, low-speed heavy
       Such material hardness and strength than babbitt high corrosion resistance, but running-poor match for the journal requires a higher hardness and smoothness, suitable for medium-speed heavy.
    4. Aluminum - bimetallic
       Low tin alloy, containing Sn0.5%
       High tin alloys, including Sn20%, diesel locomotive
       Such materials of high strength, corrosion resistance, good thermal conductivity.
    5. Ceramic-metal
       Ten graphite iron or copper ten press-molded graphite → → sintered to form a porous structure, porosity accounts for 15 ~ 35% → → oil bearing oil-soaked cook.
       In operation, a suction effect due to the rotation of the journal;. B. Expansion of the role of bearing heating oil, the oil is pressed people friction surface.
        When not working, due to the capillary action of the oil and return void.
       This pad due to poor toughness applies only to steady the load and speed of small, poor lubrication conditions for the occasion.