1. Friction compatibility The performance of preventing adhesion and forming boundary lubrication when the shaft diameter is in direct contact with the bearing bush. The material factors that affect the friction compatibility of a friction pair are: (1) The degree of difficulty of forming alloys in the metallurgy of secondary materials. (2) Affinity between materials and lubricants. (3) The friction coefficient of the paired materials 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. Forceps The ability of a material to prevent scratching and/or abrasive wear by allowing the entrainment of foreign hard particles in the lubricant. For metal materials, those with low hardness and low modulus of elasticity have good clamping properties, while non-metallic materials are not necessarily so, such as carbon graphite, which has a low modulus of elasticity but poor clamping properties. Spherical roller bearings usually use softer materials and harder materials to form the friction width, and generally use softer materials as bearing bushes. 3. Run-in During the running-in process of the shaft diameter and the bearing pad, the machining error, coaxiality error, and surface roughness parameter values of the shaft diameter and the bearing pad are reduced to make the contact uniform, thereby reducing the friction and wear rate. 4. Friction compliance The material compensates the initial poor fit of the sliding friction surface and the deflection performance of the shaft by the elastoplastic deformation of the surface layer. Materials with a low modulus of elasticity are more compliant. 5. Abrasion resistance The ability of the secondary material to resist wear. Under the specified wear conditions, the wear resistance is expressed by the wear rate or the wear degree or the reciprocal of the wear amount. 6. Anti-fatigue The ability of a material to resist fatigue failure under cyclic loading. At the service temperature, the strength, hardness, impact strength and tissue uniformity of the bearing material are very important for fatigue resistance. Materials with good running-in and clamping properties usually have poor fatigue resistance. 7. Corrosion resistance The ability of a material to resist corrosion. When lubricating oil is used in the atmosphere, it will gradually oxidize and produce acidic substances, and most lubricating oils also contain extreme pressure additives, which will corrode FAG bearing materials. Therefore, spherical roller bearing materials need to have corrosion resistance. 8. Cavitation resistance When the solid is moving relative to the liquid, when the bubbles in the liquid break near the solid surface, local impact high pressure or local high temperature will be generated, which will lead to cavitation wear. The ability of a material to resist cavitation wear is called cavitation resistance. Generally, copper-lead alloys, tin-based FAG spherical roller bearing alloys and aluminum-zinc-silicon alloys have better cavitation resistance. 9. Compressive strength The ability to withstand unidirectional loads without being crushed or changing dimensions.  

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