Electrochemical formation of Al-Sc alloy in molten salt

Polat, Çağlar
Al-Sc alloys have better mechanical properties in comparison to commercial aluminum alloys. The aim was to produce Al-Sc alloys containing at least 2wt % scandium by electrochemical reduction of the byproducts such as ScF3 or the alternative compounds obtained from hydrometallurgical processing of low grade lateritic nickel in this thesis. Electrochemical production of Al-Sc alloy in pure molten CaCl2 and CaCl2-NaCl mixtures was studied for this purpose. The graphite-liquid aluminum-CaCl2 or CaCl2-NaCl interaction, the effect of voltage and duration of the electrolysis on Sc recovery rate, the coalescence behavior of the electrolytic Al-Sc alloy in molten CaCl2 and CaCl2-NaCl mixtures, the effect of CaO left from the dehydration process on the purity of Al-Sc alloy and the effect of NaCl addition into the electrolyte were investigated. In addition, solubility behavior of ScF3 in pure molten CaCl2 and CaCl2-NaCl mixtures and utilization of different cathode materials and ceramic membranes were examined. According to the results of the optical microscopy, SEM-EDS and XRD analyses, Al-Sc alloys were produced successfully by electrochemical reduction of domestic scandium bearing powder containing ScF3, NaScF4 and Na3ScF6 phases. Alloying in-situ with liquid aluminum in both molten CaCl2 and CaCl2-NaCl salt mixtures with molten salt electrolysis method was possible.


Mechanical properties of Ti6Al4V parts produced by electron beam melting and topology optimization in different building directions
Temel Yiğitbaşı, Selen; Konukseven, Erhan İlhan; Gülcan, Orhan; Department of Mechanical Engineering (2018)
Titanium and its alloys are used in various industries due to their mechanical properties such as high corrosion resistance, high strength and low-density. However, utilization of parts made of titanium are limited since the lead time for raw material is long, they are hard to machine, and the machining costs are high. On the other hand, it is possible to produce complex parts with powder material by additive manufacturing techniques, and there is a growing interest in research on these new technologies. El...
Production of rare earth ferrosilicide alloy
Topkaya, Yavuz Ali; Geveci, Ahmet (2006-08-31)
Rare earth ferrosilicide is a versatile alloy mainly used to control the detrimental effects of sulfur in steel and to modify graphite structures in cast iron.
Sonat, Emine Evren; Özerinç, Sezer; Department of Mechanical Engineering (2021-12-10)
Carbon fiber reinforced polymer (CFRP) composites are increasingly used in the aerospace industry due to their high specific strength compared to conventional metallic materials. However, a significant shortcoming of these composites is their increased susceptibility to damage. Structural repair is a common method to restore the load-carrying capacity of a damaged part when the damage size exceeds the pre-defined tolerances. Scarf and stepped bonded repair methods are the primary choice for cases that requi...
Electrochemical production of molybdenum refractory metal powders
Akpınar, Bengisu; Karakaya, İshak; Department of Metallurgical and Materials Engineering (2019)
Molybdenum (Mo) is a refractory metal and mostly used as an alloying agent in cast iron, steels and superalloys to enhance hardenability, strength, toughness and corrosion resistance. It also finds other uses either in the form of a pure metal or an element in, for example, lubricants and catalysts. Traditional metal production methods are not suitable for molybdenum because pure molybdenum has a very high melting point and tends to be oxidized at low temperatures. Hydrogen reduction of molybdenum oxide is ...
Waste Generation in Primary and Secondary Aluminum Sector in Turkey
Küçük, Elif; Danacı, Dilara; Yetiş, Ülkü (null; 2017-06-21)
Aluminum is the most produced and used metal following steel in the world because of its combination of physical properties. Aluminum is produced in two ways; primary aluminum production and secondary aluminum production. The main objectives of this study are to find out waste generation in aluminum industry, to determine waste generation factors(WGFs)and to suggest best available techniquesfor the management of wastes from this activity. Fordetermination of waste g...
Citation Formats
Ç. Polat, “Electrochemical formation of Al-Sc alloy in molten salt,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Metallurgical and Materials Engineering., Middle East Technical University, 2019.