OBTAINING OF NICKEL AND COBALT COATING ALLOYS BY DIFFUSION SATURATION WITH DYSPROSIUM IN LiCl–KCl–DyCl3 MELT
https://doi.org/10.17073/1997-308X-2016-3-51-57
Abstract
A gravimetric method was used to study the influence of process temperature (Т) and duration (τ) on the specific mass variation of nickel and cobalt specimens during their currentless diffusion saturation with dysprosium in a liquated eutectic mixture of lithium and potassium chlorides with dysprosium chloride added (5 wt.%). The experimental results allowed to calculate the mathematical dependences Р(τ) for nickel specimens in the temperature range of Т = 773÷973 К at τ = 1÷8 h, and for cobalt specimens in the temperature range of Т = 873÷973 К at τ = 1÷7 h. Their analysis showed that the solid-state diffusion is the rate-controlling step of currentless dysprosium transfer to Ni and Co specimens. The composition of coating alloys was studied using the X-ray fluorescence spectrometer, X-ray microanalyzer, and scanning microscope. It was found that under experimental conditions, the coating forming on the nickel substrate surface consists of one structural zone, but when substrate material is cobalt, the coating consists of two structural zones. This is consistent with available literature data on the alloying of similar bimetallic systems.
About the Authors
A. V. Kovalevskiy
Vyatka State University
Russian Federation
Russian Federation
PhD, Associate Prof., Department of electrochemical production technology.
610000, Russia, Kirov, Moskovskaya str., 36. E-mail: denis512a@mail.ru
D. A. Kondratyev
Vyatka State University
Russian Federation
Russian Federation
Dr. Sci. (Tech.)., Prof., Department of electrochemical production technology VyatSU
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Review
For citations:
Kovalevskiy A.V., Kondratyev D.A. OBTAINING OF NICKEL AND COBALT COATING ALLOYS BY DIFFUSION SATURATION WITH DYSPROSIUM IN LiCl–KCl–DyCl3 MELT. Powder Metallurgy аnd Functional Coatings (Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional'nye Pokrytiya). 2016;(3):51-57. (In Russ.) https://doi.org/10.17073/1997-308X-2016-3-51-57
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