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| INFLUENCE OF RAW Mg POWDER ON BEHAVIOR OF PHASE FORMATION FOR Mg-B SYSTEM |
| Ｓhi－Ｃheng ＹＡＮ;;; |
| 西北工业大学 |
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Cite this article:
Ｓhi－Ｃheng ＹＡＮ. INFLUENCE OF RAW Mg POWDER ON BEHAVIOR OF PHASE FORMATION FOR Mg-B SYSTEM. Acta Metall Sin, 2007, 43(4): 358-362 .
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Abstract The MgB2 bulks were prepared using the spherical magnesium powder (denoted as Q-Mg) and scrapping magnesium powder (denoted as X-Mg) as raw materials. The two kinds of magnesium powder were mixed with amorphous boron powder with a nominal stoichiometry of MgB2, then pressed into pellets under a pressure of 10MPa. The pellets were sintered at 650℃，700℃，750℃ and 800℃ respectively. The X-ray diffraction analysis results for the sintered samples show that the phase formation rate of Q-Mg series samples is lower than that of X-Mg series samples. The differential scanning calorimetry (DSC) results indicate that the solid-solid reaction , Mg melting and liqiud-solid reaction during the temperature increasing occur in turn at 527.1℃，650.7℃ and 660.8℃ for the X-Mg series samples, but for the Q-Mg series samples, the Mg melting and liqiud-solid reaction occur in turn at 640.9℃ and 712.3℃.
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Received: 10 August 2006
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