Inicio  /  Coatings  /  Vol: 8 Núm: 6 Par: June (2018)  /  Artículo
ARTÍCULO
TITULO

Superconducting Niobium Coatings Deposited on Spherical Substrates in Molten Salts

Anton Dubrovskiy    
Maksim Okunev    
Olga Makarova and Sergey Kuznetsov    

Resumen

The interaction of substrates from ceramics, beryllium, and carbopyroceram with the electrolyte for the electrodeposition of niobium coatings was investigated. The corrosion resistance of spherical ceramic and beryllium samples with the protective molybdenum films obtained by magnetron sputtering was studied. The exfoliation of molybdenum film from ceramics and beryllium samples was observed after the experiments due to the interaction of substrates with the melt. It was found that the carbopyroceram did not corrode in the niobium containing melt and this material was chosen as the substrate for the electrodeposition of superconducting niobium coatings. The influence of the oxide ions on the electrochemical behavior of niobium complexes in the NaCl?KCl?NaF?K2NbF7 melt was studied. A special form of the cathode was constructed for the electrodeposition of niobium coatings on spherically shaped substrates. Electrodeposition of the niobium coatings on spheres 10 mm in diameter manufactured from carbopyroceram was carried out at 750 °C with the cathodic current density of 5 × 10-3?2 × 10-2 A·cm-2 and the electrolysis time of 8?12 h. Influence of the cathodic current density on the microstructure of niobium coatings was studied. The roughness, nonsphericity, and superconductive properties of niobium coatings were determined.

 Artículos similares

       
 
Oleg S?b?l`,Andrii Meilekhov,Valeria Subbotin?,Olena Rebrova     Pág. 16 - 23
The method of x-ray diffractometry was used to study the effect of the composition of two, three, four and five elemental niobium-based alloys on their phase-structural state, average crystallite size, and thermal expansion coefficient in the temperature... ver más

 
Hanna Skliarova, Sara Cisternino, Gianfranco Cicoria, Mario Marengo, Emiliano Cazzola, Giancarlo Gorgoni and Vincenzo Palmieri    
Magnetron sputtering is proposed here as an innovative method for the deposition of a material layer onto an appropriate backing plate for cyclotron solid targets aimed at medical radioisotopes production. In this study, a method to deposit thick, high-d... ver más
Revista: Instruments

 
Ariel Amaya, Oscar Piamba and Jhon Olaya    
Biodiesel is a renewable fuel consisting of alkyl esters, which show a higher corrosive behavior when compared with a diesel fuel. The corrosive processes by biodiesel affects the processing infrastructure of this biofuel and mechanical parts of automoti... ver más
Revista: Coatings

 
Dmitry Wainstein and Anatoly Kovalev    
This paper generalizes the results of our research, which was aimed at the development of adaptive cutting tool coatings for high speed dry cutting, from the inception of the idea to complex multilayer coatings for processing tough metals. Typically, the... ver más
Revista: Coatings

 
Lalitendu Das, Praveen Kolar, Ratna Sharma-Shivappa, John J. Classen and Jason A. Osborne    
Valorization of lignin into aromatics has driven researchers for decades. In this research, niobium was deposited on oyster shells (OSNC) and carbon rods (CRNC) and tested as a catalyst for depolymerization of lignin. Catalysts (2%, 5%, and 8% loading) w... ver más
Revista: ChemEngineering