1. Iron-based: Iron resources are abundant and easy to obtain, low cost, high strength, good wear reduction performance, good wear resistance, and high load capacity, it successfully replaced the casting of bartonite and bronze bearings. There are many qualities, mainly oil-impregnated sintered iron, iron-graphite, iron-copper-graphite, iron-sulfur-graphite, and sintered iron-based materials containing solid lubrication caf2, Mos2, etc.
2. Copper base: wear reduction performance, corrosion resistance, and high electrical conductivity. Therefore, it is widely used. Among them, the most used are porous bronze, sintered bronze – steel-backed bimetal, three-layer composites, and bronze-graphite materials.
3. Aluminum base: small density, high service life, twice as high as bronze oil bearing, wear resistance is also higher than iron-based oil, excellent thermal conductivity, can withstand higher loads, low operating noise, good vibration resistance, excellent corrosion resistance, and low cost. The mainly aluminum-copper system, Al-Cu-Mg-Si system, sintered aluminum-graphite system, aluminum-lead alloy-steel-backed bimetal bearings, etc.