REEbearing

REEbearing denotes bearing systems or components that rely on rare earth elements (REEs) in their materials or architecture. The term is primarily used for assemblies that integrate rare earth magnets into the bearing design, especially in magnetic bearings or magnetic couplings, but it can also describe bearings that use REE-containing alloys or dopants to enhance performance.

Common REEs in bearing contexts are neodymium (Nd) and samarium (Sm), used in NdFeB and SmCo magnets. These magnets enable high energy density and compact form factors for contactless support, sensor actuation, or torque transmission. In addition, REEs may be incorporated as minor alloying elements or ceramic dopants to improve high-temperature stability, hardness, wear resistance, or lubrication retention in traditional rolling or plain bearings.

Applications range from active magnetic bearings (AMBs) in high-speed turbines, generators, and flywheels to bearing assemblies in precision machines and magnetically coupled systems. REEbearing components may reduce friction and enable non-contact support, but also pose challenges related to magnetic aging, heat management, and magnet price volatility. The supply risk and environmental footprint of REEs influence design choices, prompting research into recycling, substitution with less critical materials, and alternative lubrication strategies.

See also: Rare earth magnets, NdFeB, SmCo, magnetic bearing, ceramic bearing, hybrid bearing, tribology.