Effects of additives on mechanical milling and hydrogenation of magnesium powders

Date

2004-04-01

Author

Guvendiren, M
Bayboru, E
Öztürk, Tayfur

Metadata

Show full item record

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

Item Usage Stats

155
views

0
downloads

A study is carried out on the role of additives for structural refinement of magnesium powders in mechanical milling. Additives, namely Al2O3, SiC, V and graphite are chosen so as to cover a wide hardness range. Structural refinement after milling is studied both metallographically and in terms of X-ray line broadening. It is found that for efficient structural refinement, the additives should be chosen not on the basis of their hardness but rather whether or not they are preserved with an acceptable size during milling. Thus, of the additives, it is found that graphite and Al2O3 are most effective. The milled structures are modified upon exposure to hydrogenation temperature, leading to similar structural sizes. In terms of hydrogenation, graphite appears to be the most effective additive. A storage capacity of 6.0 wt% is reached with a quite fast sorbing rate. (C) 2003 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.

Subject Keywords

Magnesium hydride, Hydrogen storage, Sorption kinetics, Mechanical milling, Structural refinement, Additives in milling

URI

https://hdl.handle.net/11511/30297

Journal

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY

DOI

https://doi.org/10.1016/s0360-3199(03)00091-0

Collections

Graduate School of Natural and Applied Sciences, Article

Suggestions

OpenMETU
Core

Effect of process control agents on synthesizing nano-structured 2Mg-9Ni-Y catalyst by mechanical milling and its catalytic effect on desorption capacity of MgH2 Hosseini-Gourajoubi, Faranak; Pourabdoli, Mehdi; Üner, Deniz; Raygan, Shahram (2015-03-01) Synthesizing 2Mg-9Ni-Y catalyst was investigated by mechanical alloying of Mg, Ni, and Y elemental powder mixture and subsequent heat treatment. Accordingly, effects of milling time, process control agent (PCA) type (stearic acid and toluene), and heat treatment time on the powder microstructure, phase composition, and powder morphology were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), and laser particle size analyzer (LPSA). Results showed that particle size of the samples prepar...
Effects of nanoclays on the flammability of polystyrene with triphenyl phosphate-based flame retardants Kaynak, Cevdet (SAGE Publications, 2013-07-01) The main purpose of this study is to investigate the effects of nanoclays on the flammability behavior of neat polystyrene and polystyrene compounded with traditional flame retardants triphenyl phosphate and its synergist melamine cyanurate. Nanocomposites were prepared via ultrasound-assisted solution intercalation technique. Dispersion and nanomorphology of nanoclays were investigated through X-ray diffraction analysis and transmission electron microscopy. Thermal stability and flammability behaviors were...
Effect of process parameters on mechanical properties of high pressure die cast magnesium AZ91 components Okcu, Işık Yılmaz; Kalkanlı, Ali; Department of Metallurgical and Materials Engineering (2011) Before beginning the experimental work of this study, a magnesium high pressure die casting facility is set up to manufacture magnesium cast parts for defence industry. In this thesis two components are cold chamber high pressure die casted using magnesium alloy AZ91 as raw material, and one component was manufactured using both aluminium alloy A.413, and magnesium alloy AZ91. Mechanical properties of high pressure die casting parts depend on various parameters such as, thickness of the cast part, position ...
Effect of TiH2 particle size on foaming of aluminium Kubilay, Ceylan; Öztürk, Tayfur; Department of Metallurgical and Materials Engineering (2005) A study is carried out on the production of aluminum foams via powder processing. The study deals mainly with the effect of TiH2 particle size on the process of foaming. Mainly two TiH2 particle sizes were used; namely 27,5 ?m and 8,5 ?m. Foaming experiments were carried out at temperatures between 675oC ا 840oC. The viscosity of the system is adjusted by controlled addition of Al2O3. The study shows that choice of foaming agent size is influential in the foaming process. With the use of fine foaming agent,...
Effect of carbon nanotube surface treatment on the morphology, electrical, and mechanical properties of the microfiber-reinforced polyethylene/poly(ethylene terephthalate)/carbon nanotube composites Yesil, Sertan; Bayram, Göknur (2013-01-15) The aim of this study is to investigate the effects of carbon nanotube (CNT) chemical properties, CNT content, and molding temperature on the morphology, electrical, and mechanical properties of the microfiber-reinforced polymer composites. These composites were prepared by extrusion and hot stretching the poly(ethylene terephthalate) (PET)/CNT phase in high density polyethylene (HDPE) matrix. Surfaces of the CNT were modified by purification with strong acid mixture (HNO3 : H2SO4 mixture 1 : 1 by volume) f...

Citation Formats

M. Guvendiren, E. Bayboru, and T. Öztürk, “Effects of additives on mechanical milling and hydrogenation of magnesium powders,” INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, pp. 491–496, 2004, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30297.