1. friction and compatibility
Shaft diameter when direct contact with the bearing preventing adhesion of forming boundary lubrication performance. Effects of friction and compatibility of materials of friction factors are:
(1) pair materials of metallurgical constitutes ease of alloy.
(2) materials and lubricants for affinity.
(3) pair materials of friction coefficient in a lubrication-free State.
(4) the microstructure of the material.
(5) the thermal conductivity of the material.
(6) material size and properties of oxide film on the surface.
2. clamping
Rigid particles at home and abroad to clamp material allows lubricants to prevent scratching or (and) ability to abrasive wear. On metallic materials, low hardness and elastic modulus of low, clamping is good, is not necessarily non-metallic materials, such as carbon graphite, lower elastic modulus, but clamping is not good. SKF bearings with hard materials, usually with a relatively soft material friction pieces generally do with softer material bearing.
3. running
Shaft diameter and bearing of the break-in process, reduced size and bearing, coaxiality error, processing error surface roughness parameter values, makes contact with uniform, thus reducing friction, wear rate of capacity.
4. friction compliance
Elasto-plastic deformation compensation of material surface of sliding surface of the initial combined with bad performance. Low elastic modulus of material compliance is good.
5. wear resistance
Vice-material's ability to resist wear. Wear under conditions, the rate of wear or wear, wear to represent the back of resistance to abrasion.
6. fatigue resistance
Resistance to fatigue failure under cyclic loading capacity. Using temperatures, bearing material strength, hardness, impact fatigue strength and structure uniformity of confrontation is very important. Break-in, good clamping materials, usually poor resistance to fatigue.
7. corrosion resistance
Material's ability to resist corrosion. Lubricants when used will be gradually oxidized in the atmosphere, acidic substances, and in most also contain extreme pressure additives in lubricating oils, they are corrosion SKF bearing materials, therefore, SKF bearing materials requiring corrosion resistance.
8. the cavitation erosion resistance of
Solid state relative to the liquid movement, when the liquid bubble near solid surface burst, have local impact high pressure or localized high temperature will cause cavitation erosion. Material's ability to resist cavitation erosion resistance known as cavitation. In General, copper-lead alloy, Tin-base and SKF bearing alloy of Al-Zn-SI system alloy better cavitation resistance.
9. compressive strength
Accomodate load and not crush capacity or size does not change.



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