Abstract
We consider the results of studies on the choice of material of the lower radial bearing of the pump designed to circulate lead–bismuth coolant. The circulation of the liquid coolant is provided by a vertical axial pump having a “long” shaft. In this design, it is necessary to provide for the lower bearing the lubrication carried out with lead–bismuth coolant. Having analyzed the operating conditions of the axial pump, we decided to carry out the lower bearing in accordance with the scheme of a hydrodynamic sliding bearing. The materials of friction pairs in such a bearing must withstand the stresses arising from the operation of the pump, as well as the aggressive conditions of the coolant. Nonmetallic materials—ceramics and carbon-based composite materials—were selected on the basis of the study of published data for experimental research on the corrosion and heat resistance in the lead–bismuth environment.
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