1.Friction compatibility The performance of the shaft diameter and the direct contact with the shaft shingle to prevent the occurrence of adhesion and the formation of boundary lubrication. The material factors that affect the frictional compatibility of the frictional side are. (1) into the sub-material metallurgy into the degree of difficulty in the composition of the alloy. (2) material and the affinity of the lubricant. (3) the friction factor of the sub-material in the non-lubricated state. (4) The microstructure of the material. (5) The thermal conductivity of the material. (6) The size of the surface energy of the material and the characteristics of the oxide film. 2. Clamp-in property The ability of a material to allow the lubricant to clamp in hard particles from outside and prevent scratching or (and) abrasive wear. For metal materials, low hardness and low modulus of elasticity, the clamp-in is good, while non-metallic materials are not necessarily, for example, carbon graphite, low modulus of elasticity, but the clamp-in is not good. Spherical roller bearings usually use softer materials and harder materials constitute the friction amplitude, generally use softer materials to do shaft tile. 3.Wearability In the grinding process of shaft diameter and shaft tile, reduce the shaft diameter and shaft tile processing error, coaxiality error, surface roughness parameter value, so that the contact uniformity, thus reducing the friction, the ability to wear rate. 4. Friction compliance Material by the surface of the elastic-plastic deformation to compensate for poor initial fit and shaft deflection performance of the sliding friction surface. The material with low modulus of elasticity has better compliance. 5. Wear resistance The ability of a sub-material to resist wear. Under the specified wear conditions, the wear resistance is expressed by the wear rate or wear degree, the reciprocal of the wear amount. 6.Fatigue resistance The ability of the material to resist fatigue damage under cyclic load. At operating temperature, the strength, hardness, impact strength and organizational uniformity of the shaft material are very important to resist fatigue. The material with good abrasion and clamp-in properties usually has poor fatigue resistance. 7. Corrosion resistance The ability of the material to resist corrosion. Lubricating oil will gradually oxidize when used in the atmosphere, producing acid, and in most lubricants also contain extreme pressure additives, they will corrode FAG bearing materials, therefore, spherical roller bearing materials need to have corrosion resistance. 8.cavitation resistance Solid relative to the state of liquid movement, when the liquid bubble in the solid surface near the rupture, resulting in local impact high pressure or local high temperature, will lead to cavitation wear. The ability of the material to resist cavitation wear is called cavitation resistance. Usually, copper-lead alloy, tin-based FAG spherical roller bearing alloy and aluminum-zinc-silicon system alloy cavitation resistance is better. 9. Compressive strength The ability to withstand one-way load without being squeezed or size change.

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