Authors & Affiliations
Beznosov A.V., Bokova T.A., Shumilkov A.I., Zaboyeva D.S.
Nizhny Novgorod State Technical University n.a. R.E. Alekseyev, Nizhny Novgorod, Russia
Beznosov A.V. – Dr. Sci. (Tech.), Professor, Institute of nuclear energy and technical physics in Nizhny Novgorod State Technical University n.a. P.E. Alekseeva. Contacts: 24, Minin st., Nizhny Novgorod, Russia, 603950. Tel.: (831)436-80-23; e-mail:
Bokova T.A. – PhD (Tech.), Associated Professor, Institute of nuclear energy and technical physics in Nizhny Novgorod State Technical University n.a. P.E. Alekseeva.
Shumilkov A.I. – Vedas engineer, Institute of nuclear energy and technical physics in Nizhny Novgorod State Technical University n.a. P.E. Alekseeva.
Zaboyeva D.S. – graduate student, Institute of nuclear energy and technical physics in Nizhny Novgorod State Technical University n.a. P.E. Alekseeva.
Abstract
At the NNSTU n.a. R.E. Alekseyev, a set of calculation-and-theoretical and experimental investigations is under way in order to explore effects of the wall boundary layer: steel - heavy liquid-metal coolant and the oxide coating developing on steels on the tribological characteristics of contact friction pair working surfaces (coefficient of friction, etc.) at variable parameters of the high temperature molten lead and Pb-Bi. The formed oxide coatings and the wall boundary layer protect contact surfaces of steels and irons against solidification, thereto related tearing in depth and other negative effects. They are of major importance in operating contact surfaces in reactors. The coolant oxide and steel component compound particles, bubbles of vapors, gases, etc. in wall boundary layers of friction surfaces impregnated with the coolant produce an effect similar to that of a lubricant. Whereas the wall boundary layer may be impregnated with structural material component compounds, the contact pair friction may under such conditions cause an intensive wear of the contact surfaces.
The main objective of the experimental results is to improve the service life of mechanisms with contact friction pairs operating in a high-temperature molten lead coolant under conditions close to those of a reactor plant cooled with HLMC and to define tribological characteristics for justification of design choices.
In order to define tribological characteristics of contact friction pairs, the research was conducted in a molten lead at 450-500°C, at a fixed oxygen content in the coolant, material of the friction pair samples: steel 12Kh18N10T, condition of the contact surfaces – material in the delivery condition and material with oxide coatings formed on the contact surfaces of the samples in the molten lead medium.
As a result of the conducted research, a large body of experimental data pertaining to tribological characteristics of contact friction pairs has been obtained, and a positive effect of oxide coatings (a reduction in the friction coefficient) formed on the contact surfaces operating in a high-temperature molten lead on the contact friction pairs when in an alternate (pin-plate) and spinning (shaft-sleeve) motion of the contact friction pair has been shown.
Keywords
heavy liquid-metal coolant, gear-wheel pump, tribology in a HLMC medium, friction coefficient, contact friction pairs, high-temperature test bench, wall boundary layer in HLMC
Article Text (PDF, in Russian)
UDC 621.039
Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2016, issue 4, 4:7