Bearing assembles, roller bearing unites, races, methods of making same, and apparatus comprising same

摘要

Disclosed is a bearing assembly with a rolling bearing unit 24, an inner race 140 and an outer race 130. The rolling bearing unit is formed of polycrystalline super-hard material having a mean mass density of at most 4.5 g/cm and a volume-weighted arithmetic mean thermal conductivity of at least 100 W/m.K. The super-hard material may be polycrystalline diamond (PCD), polycrystalline cubic boron nitride (PCBN), or silicon carbide-bonded diamond (SCD). The super-hard material may include interstitial volumes between super-hard grains, these volumes being voids or non-super-hard material. The rolling bearing unit may be substantially free of a cemented carbide substrate and may consist essentially of a mass of polycrystalline super-hard material. It may also comprise a plurality of different super-hard materials or different grades of the same kind of super-hard material. The races of the bearing assembly may also include super-hard material, which may have the same properties as that used for the rolling bearing unit. Also disclosed is a gas turbine apparatus with the abovementioned bearing assembly, as well as an aircraft propulsion system with said bearing assembly, and a method of making the bearing assembly.