Synthesis of Fe-4.6 wt% B alloy via electro-deoxidation of mixed oxides

Date

2009-07-01

Author

Ors, Taylan
Tan, Serdar
Öztürk, Tayfur
Karakaya, İshak

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

215
views

0
downloads

Fe-4.6 wt% B alloy was synthesized via electro-deoxidation of the mixed oxide precursor. The oxides, Fe2O3 and B2O3, mixed in suitable proportions were sintered at 900 A degrees C yielding pellets with a two-phase structure; Fe2O3 and Fe3BO6. The sintered pellets, connected as cathode, were then electro-deoxidized in molten CaCl2 or in CaCl2-NaCl eutectic, against a graphite anode at 3.1 V. The electrolysis at 850 A degrees C has successfully yielded a powder mixture of Fe and Fe2B. Sequence of changes during the electrolysis was followed by interrupted experiments conducted at 850 A degrees C. This has shown that iron is extracted quite early during the electrolysis through the depletion of oxygen from the starting oxide; Fe2O3, forming the other iron oxides in the process. Boron follows a more complicated route. Fe3BO6, the initial boron-bearing phase, was depleted in the early stages due to its reaction with molten salt. This gave rise to the formation of calcium borate. Boron was extracted from calcium borate in later stages of electrolysis, which appeared to have reacted in situ with the iron forming compound Fe2B.

Subject Keywords

Molten calcium-chloride, Electrochemical reduction, Precursors, Titanium, Cacl2, Electrodeoxidation, Powder, Nb2o5, Tio2

URI

https://hdl.handle.net/11511/31227

Journal

JOURNAL OF MATERIALS SCIENCE

DOI

https://doi.org/10.1007/s10853-009-3474-z

Collections

Graduate School of Natural and Applied Sciences, Article

Suggestions

OpenMETU
Core

Synthesis of FeTi from mixed oxide precursors Tan, Serdar; Oers, Taylan; Aydınol, Mehmet Kadri; Öztürk, Tayfur; Karakaya, İshak (2009-05-05) A study was carried out on the synthesis of FeTi intermetallics from mixed oxide precursors using the method of electro-deoxidation. Fe2O3 and TiO2 mixed in molar proportions of 1:2 were sintered at temperatures ranging from 900 degrees C to 1300 degrees C. The sintered pellet of mixed oxides, connected as cathode, was then electrolyzed in a molten CaCl2 at 900 degrees C using a graphite anode at a potential of 3.2 V. The electrolysis yielded the target composition FeTi in substantial amounts only when the ...
Synthesis of new mediators for electrochemical nad/nadh recycling Khalily, Mohammad Aref; Demir, Ayhan Sıtkı; Department of Chemistry (2011) The synthesis of enantiopure compounds can be achieved by using dehydrogenases as biocatalysts. For instance, reduction reactions of prochiral compounds (ketones, aldehydes and nitriles) into chiral compounds can be achieved by dehydrogenases. These dehydrogenases are cofactor dependent where cofactor is Nicotinamide Adenin Dinucleotite having some restrictions that confines usage of dehydrogenases in organic synthesis including instability of cofactor in water and high cost. Therefore, suitable recycling m...
Synthesis of CuO nanostructures on zeolite-Y and investigation of their CO2 adsorption properties Boruban, Cansu; Nalbant Esentürk, Emren (2017-10-01) Copper(II) oxide (CuO) nanoparticles (NPs) in two different morphologies, spiky and spherical, were synthesized on zeolite-Y by a modified impregnation method, and their CO2 adsorbing capabilities were investigated under standard conditions (1 atm and 298 K). The properties and CO2 adsorption performances of the hybrid systems were characterized by transmission electron microscopy, scanning electron microscopy, energy dispersive X-ray, X-ray diffraction, X-ray photoelectron spectroscopy, atomic absorption s...
Synthesis of boron and zirconium co-doped titanium dioxide nanopowders by the sol-gel technique / Ağartan, Lütfi; Öztürk, Abdullah; Park, Jongee; Department of Metallurgical and Materials Engineering (2014) Effects of water/Ti precursor molar ratio (R ratio) and calcination regime on the photocatalytic properties of undoped, boron (B) doped, zirconium (Zr) doped, and B and Zr co-doped TiO2 powders synthesized by sol-gel process were researched. Undoped powders were synthesized for R ratio of 1, 3, 5, 10, 30, and 50 while doped and co-doped powders were synthesized for R ratio of 50. Undoped powders were calcined at 300, 400, and 500oC for 1, 2, and 3 h while doped and co-doped powders were calcined at 300 and ...
Synthesis, characterizations and investigation of thermoluminescence properties of strontium pyrophosphate doped with metals Ilkay, L. S.; ÖZBAYOĞLU, GÜLHAN; Yılmaz, Ayşen (2014-11-01) Strontium pyrophosphate, Sr2P2O7, was synthesized by solid-state synthesis method; the product was co-doped with copper-silver (Cu-Ag), copper-indium (Cu-In) and manganese-praseodymium (Mn-Pr) oxides (CuO, MnO, In2O3, Pr6O11 and AgNO3) by solid-state reaction method. The variation of dopant concentrations was investigated from 0.5 to 15% by weight. In addition to these processes, chemical characterizations of samples and the investigation of thermoluminescence (TLD) properties of strontium pyrophosphate wit...

Citation Formats

T. Ors, S. Tan, T. Öztürk, and İ. Karakaya, “Synthesis of Fe-4.6 wt% B alloy via electro-deoxidation of mixed oxides,” JOURNAL OF MATERIALS SCIENCE, pp. 3514–3519, 2009, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/31227.