Friction and compatibility
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 alloy on the degree of difficulty.
(2) materials and lubricants for compatibility.
(3) Deputy friction factor of the material in the absence of lubrication.
(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
Materials allow the lubricant at home and abroad to clamp down and prevent scratching or hard particles (and) abrasive wear ability. Metallic materials, low hardness and low elastic modulus, clamping on the good, and is not necessarily non-metallic materials, such as graphite, modulus of elasticity is low, but clamping is not good. Bearings are usually soft and hard materials constitute friction piece, General doing with softer materials bearing.
3. run-in
Shaft and bearing in the integration process, reducing the shaft and bushing, coaxiality error, processing error parameters of surface roughness values, makes contact with uniform, thereby reducing friction and wear rate.
4. compliance of friction
Sliding surface of the initial material on the surface of Elasto-plastic deformation compensation combined with malnutrition and the deflection of the shaft 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 wear and tear, wear countdown to wear resistance.
6. fatigue resistance
Capacity in resistance to fatigue failure under cyclic loading. Using temperature, bearing material strength, hardness, impact fatigue strength and structure uniformity of confrontation is very important. Grinding, good clamping of material, usually poor resistance to fatigue.
7. corrosion resistance
Material's ability to resist corrosion. Lubricant used in the atmosphere will gradually oxidized to produce acids, and in most lubricants containing EP additives they are corrosion of bearing materials, therefore, NSK bearings corrosion resistance of materials required.
8. the cavitation erosion resistance of
Solid state relative to the fluid movement, when the liquid bubbles near solid surface rupture in, have a local impact and high pressure or localized high temperature will result in cavitation erosion. Material resistance to cavitation erosion resistance known as cavitation. In General, copper, lead, zinc, alloys, Tin-base bearing alloys and Silicon series alloys good resistance to cavitation.
9. compressive strength
Accomodate load without being bad or the ability to size does not change.



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