1. compatibility of the friction
　　When direct contact between shaft and bearing preventing adhesion formation of boundary lubrication properties. Factors influencing the friction friction and compatibility of materials are:
　　(1) pair materials of metallurgical composition on ease of alloys.
　　(2) materials and lubricants affinity.
　　(3) pair materials of friction factor in a lubrication-free State.
　　(4) the microstructure of materials.
　　(5) the thermal conductivity of the material.
　　(6) material size and properties of oxide film on the surface.
　　2. clamping
　　Material clamping rigid particles at home and abroad allow lubricant to prevent scratching or (and) capacity of abrasive wear. For metals, and low hardness and low elastic modulus, clamping on the good, and non-metallic materials are not necessarily, for example carbon graphite, modulus of elasticity is low, but clamping is not good. Tapered roller bearings are normally more soft and hard materials constitute friction piece, Bush usually use soft materials.
　　3. run-in
　　Shaft and bearing during the break-in process, reducing the diameter, coaxiality error, processing error and pad surface roughness parameter values, make contacts even, so as to reduce the rate of friction, wear ability.
　　4. friction compliance
　　Sliding friction surface material on the surface of Elasto-plastic deformation compensation initially combined with bad performance. Low modulus of elasticity of materials compliance is good.
　　5. wear resistance
　　Vice-material's ability to resist wear. The prescribed wear conditions, wear or abrasion, wear countdown to show resistance to abrasion.
　　6. fatigue resistance
　　Resistance to fatigue failure under cyclic loading capacity. At a temperature of use, bearing material strength, hardness, impact fatigue strength and structure uniformity of confrontation is very important. Run-in, good clamping of material, usually poor resistance to fatigue.
　　7. corrosion resistance
　　Material's ability to resist corrosion. Lubricants with gradual oxidation in the atmosphere, acidic substances, and most also contain extreme pressure additives in lubricating oils, they are corroded bearings material and, therefore, requires corrosion resistance of tapered roller bearing material.
　　8. resistance to corrosion
　　Solid state relative to the fluid movement, when the liquid bubble near solid surface burst, impact local high temperature high pressure or partial, will result in cavitation erosion. Resistance of materials to resist cavitation erosion ability known as cavitation. In General, copper lead alloy, Tin-base bearing alloys and aluminium zinc Silicon alloy better cavitation resistance.
　　9. compressive strength
　　Accomodate load and not crush or the ability to size does not change.



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