Assistants @ Metallurgical & Materials Eng. Dept. / METU

	Serdar TAN
	Room/Lab: D-209
	(+90)312 210 5842
	E-mail: stan@metu.edu.tr
	Personal Web Page Research Group Web Page

Courses/Labs:

Introduction to Metallurgical and Materials Engineering, Scanning Electron Mic. Lab

Interests:

Hydrogen Strorage, Molten Salt Electrochemistry, Aluminium Foams

Former Degree: B.S., M.S.; Metallurgical and Materials Engineering Dept, METU

Current Degree: Ph.D.; Metallurgical and Materials Engineering Dept, METU

Direct Synthesis of Hydrogen Storage Alloys from their Oxides

Supervisor: Dr. K. AYDINOL & Dr. T. ÖZTÜRK

Most hydrogen storage alloys are complex compounds involving a number of elements. Therefore direct synthesis of such compounds from their oxides would greatly shorten their production route. The approach esentially relies on solid state deoxidation of the oxides in the molten salt. Work is in progress to synthesize Mg based intermetallics e.g. Mg₂Ni doped with elements such as Ce.

Solid state electrodeoxidation is a novel material processing technique which enables the production of metallic compounds from thier oxides. The method, orginally developed by Fray et al, is a high temperature electrochemical reduction technique. The oxides prepared with suitable proportions are made cathode from which oxygen is drained and discharged from the anode.

Solid state deoxidation can be used for the production of pure metals such as Ni , Ti etc from thier oxide ores. Here the production of Ti is illustrated, but the main advantage of the method is in the direct synthesis of compex metallic compounds. The method therefore simplifes the processing by eliminating several steps e.g. refining alloying etc, normally involved in the classical route.

Hydrogen pressure recorded in a Sievert-type apparatus for Mg-Ni-Al(produced via powder processing). Pressure drop close to 225 ^oC, implies absorption and the rise close to 375 ^oC is the result of desorption. Currently work is in progress to produce Mg₂Ni based alloys via solid state electro- deoxidation to which third elements will be incorporated, this for the purpose of reducing the sorption temperatures to values much lower than those shown above.

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