Authors & Affiliations
Orlov Yu.A., Pazyuk A.N., Plaksin O.A., Dvoryashin A.M.
A.I. Leypunsky Institute for Physics and Power Engineering, Obninsk, Russia
Orlov Yu.A. – Junior Researcher. Contacts: 1, pl. Bondarenko, Obninsk, Kaluga oblast, Russia, 249033. Tel.: +7 (484) 399-89-49; e-mail:
Pazyuk A.N. – Head of Direction.
Plaksin O.A. – Chief Specialist.
Dvoryashin A.M. – Senior Researcher.
Abstract
High-temperature eutectic Ni-Fe-Ge-Cr-Si or Ni-Fe-Ge-Cr-Si-Mn solders are used in production of elements of active cores of nuclear reactors, in particular, in fabrication of spacer grids or in ribbing thin-walled cylindric shells. Powders of these solders are usually obtained by spilling the melted solders on cold spinning discs, and subsequently grinding the obtained bands of the solders. In these paper, we focus on another method of production of solder powders, namely, the method of gas atomization of solder melts. The latter, provides means of reducing the number of technological steps in production of solder powders, and, as is also, helps to avoid formation of slags in fabricated solder powders. As a result of fast cooling during atomization, all powder particles crystalize with the same element composition as the composition of the melt. Because of the identical element composition, the temperature interval of melting becomes narrow, melting occurs uniformly, and improved wetting of the surfaces is provided. We have fabricated Ni-Fe-Ge-Cr-Si-Mn powders by gas atomization in various regimes and found the effect of atomization conditions (temperature and rate of sputtering) on fractional composition of the powders. Element and phase compositions of the atomized powders have been examined, and, with the use of the powders, ribs have been soldered on cylindric shells. It has been shown that the mechanical strength on tearing off the ribs soldered with the use of atomized solder powders are the same as that for ribs soldered with the use of ground solder powders.
Keywords
high-temperature nickel-based solder, gas atomization method, additive technologies, soldered joints, elements of active cores, nuclear power facilities
Article Text (PDF, in Russian)
UDC 669.04
Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2024, no. 1, 1:9