1. compatibility of the friction
When direct contact between shaft and bearing preventing adhesion formation of boundary lubricating properties. Factors influencing the friction friction and compatibility of materials are:
(1) pair materials of metallurgical composition on ease of alloys.
(2) compatibility of materials and lubricants.
(3) under no lubrication of the friction coefficient of materials.
(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
Foreign to clamp hard particles in the materials allow the lubricant to prevent scratching or (and) capacity of abrasive wear. For metals, and low hardness and elastic modulus of low, clamping up is not necessarily non-metallic materials, such as carbon graphite, modulus of elasticity is low, but clamping is not good. Spherical roller bearings are usually soft and hard materials constitute lots of friction, Bush usually use soft materials.
3. run-in
Shaft and bearings break-in process, reducing the shaft with bearing, coaxiality error, processing error parameters of surface roughness values, make contacts even, thereby reducing friction and wear rate.
4. compliance of friction
Sliding friction surface material on the surface of Elasto-plastic deformation compensation initial poor fit and axial Flexural Properties. 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 wear rate, expressed as the reciprocal of the resistance to wear of wear.
6. fatigue resistance
Capacity in resistance to fatigue failure under cyclic loading. Using temperature, bearing material for strength, hardness, impact resistance and homogeneity of structure is very important to combat fatigue. Break-in, good clamping of material, usually poor fatigue resistance.
7. corrosion resistance
Material′s ability to resist corrosion. Used lubricating oils in the atmosphere will gradually oxidized, acids, and in most also contain extreme pressure additives in lubricating oils, they are corroded bearings material and, therefore, spherical roller bearings, corrosion resistance of materials required.
8. resistance to cavitation
Solid state relative to the fluid movement when near bursting of bubbles in a liquid in solid surface, have a local impact and high pressure or localized high temperature will result in cavitation erosion. Resistance of materials to resist cavitation erosion ability known as cavitation. In General, copper-lead alloy and spherical roller bearing alloys and aluminium zinc Silicon series alloys better cavitation resistance.
9. compressive strength
Accomodate load and not crush or the ability to size does not change.