The effect of ball-milling treatment of original powders on the sintering process and critical current density of graphite-doped MgB2 bulks

In present study, the sintering process and superconducting properties of MgB 2 prepared with milled original powders of Mg, B, and 3 at.% Graphite were investigated. It was found that ball-milling treatment of original powders can significantly promote the C substitution for B in MgB 2 crystal latt...

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Bibliographic Details
Published in:Journal of materials science 2013-03, Vol.48 (6), p.2485-2489
Main Authors: Jiang, Hua, Ma, Zongqing, Liu, Yongchang, Dong, Zhizhong, Yu, Liming, Cai, Qi, Wang, Rui
Format: Article
Language:English
Subjects:
Ball milling
Borides
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Critical current density
Crystal lattices
Crystallography and Scattering Methods
Dioxins
Grain boundaries
Grains
Graphite
Impurities
Magnesium
Magnesium compounds
Magnesium oxide
Materials Science
Milling (machining)
Polymer Sciences
Sintering
Sintering (powder metallurgy)
Solid Mechanics
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Summary:In present study, the sintering process and superconducting properties of MgB 2 prepared with milled original powders of Mg, B, and 3 at.% Graphite were investigated. It was found that ball-milling treatment of original powders can significantly promote the C substitution for B in MgB 2 crystal lattice, resulting in more lattice distortion. Consequently, the values of J c at high fields were improved. Besides, ball-milling also refined MgB 2 grains, which enhances grain boundary pinning and is also contributed to the improved J c at high fields. On the other hand, with the milling time prolonging, Mg becomes more active and leads to an obvious increase of MgO impurities during the subsequent sintering process. These MgO impurities would degrade the connectivity between MgB 2 grains and finally lead to slight decrease in J c at low fields.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-012-7036-4