TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan)
Online ISSN : 1880-0408
Print ISSN : 0389-2441
ISSN-L : 0389-2441
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Mechanical Properties of Polycrystalline MgB2 Bulk
Tetsuya OHASHI, Satoshi HATA, Ken-ichi IKEDA, Hideharu NAKASHIMA, Akiyasu YAMAMOTO, Jun-ichi SHIMOYAMA, Shigeru HORII, Kohji KISHIO
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Keywords: MgB2 bulk, SiC, C10H8, mechanical properties, microstructure
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2008 Volume 43 Issue 8 Pages 342-348

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Abstract
Mechanical properties of superconducting MgB2 materials are important for their practical uses. This paper reports relationships between mechanical properties (Vickers hardness and fracture toughness) and the microstructure in MgB2 bulk materials. MgB2 bulk specimens were prepared by a Premix-PICT (powder in closed tube)-diffusion method. It was found that Vickers hardness and fracture toughness were improved up to about 1.5 times by co-doping with SiC and C10H8. It is interpreted that (i) the improvement of Vickers hardness by the co-doping is mainly due to reducing the MgB2 grain size, and (ii) the improvement of fracture toughness by the co-doping is mainly due to decreasing the amount of amorphous phases.
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© 2008 by Cryogenics and Superconductivity Society of Japan (Cryogenic Association of Japan)
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