1 friction compatibility
The shaft diameter of direct contact with the bearing performance of preventing adhesion and formation of boundary lubrication. Effect of friction factor is compatible materials:
(1) into the difficult easy degree accessory material metallurgy alloy.
(2) affinity materials and lubricants.
(3) into the coefficient of friction Vice materials without lubrication condition.
(4) the microstructure of materials.
(5) the material's thermal conductivity.
(6) characteristics of the material surface can size and film.
2 embedded
Material allows the lubricant in foreign hard particles clamping and prevent scratching or (and) ability to abrasive wear. On metallic materials, low hardness and elastic modulus of low, embeddedness is good, is not necessarily non-metallic materials, such as carbon graphite, the elastic modulus is low, but the embedding is not good. Angular contact bearings are usually friction pieces with soft material and hard material, usually with a soft material bearing.
3 the running-in
In the diameter of the shaft and bearing running-in process, reduce the diameter of shaft and bearing machining error, concentricity error, surface roughness parameters, the uniform contact, thus reducing the friction, the wear rate of capacity.
4 friction compliance
Material on the surface of the elastic-plastic deformation compensation slide initial friction surface with the poor and bending properties. A low modulus of elasticity material of good compliance.
5 wear resistance
As a material to resist wear ability. In the wear condition of regulated by the reciprocal, wear rate or wear, wear to wear resistance.
6 fatigue resistance
In the ability of a material to resist fatigue failure under cyclic loading. In the use of temperature, fatigue strength, bearing material hardness, impact strength and microstructure of confrontation is very important. The running-in, embeddedness of good material, usually poor fatigue resistance.
7 corrosion resistance
The ability of a material to resist corrosion. Lubricating oil used in the atmosphere will gradually oxidation, produce acidic substances, but also containing extreme pressure additives in most lubricating oil, they will erode the angular contact bearing materials, therefore, need to have the corrosion resistance of the angular contact bearing materials.
8 cavitation erosion resistance
The solid to liquid motion state, when the liquid in the bubble burst in the vicinity of solid surfaces, produce local impact pressure or the local high temperature, will cause the cavitation erosion. Material resistance to cavitation erosion and wear are called cavitation erosion resistance. Usually, good cavitation resistance of bearing alloy and aluminium zinc silicon alloy copper lead alloy, tin angle contact.



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