Abstract
MgB2 superconductors were prepared by sintering of a mixture of boron and gas-atomized AZ31 powders. The single MgB2 with superconductivity at about 38K was obtained by sintering at 1073K for 12h or at 873K for 50h. The AZ31 powders promotes a formation of MgB2 at 873K compared with pure Mg powder. The thermal analysis showed that the formation of MgB2 occurred at around 823K and a partial melting of AZ31 alloy occurred at 850K, suggesting that the MgB2 is formed at 873K through a melting phase. Then, the partially melted phase plays an important role on the formation of MgB2. The AZ31 powder is useful to obtain a MgB2 at a temperature as low as 873K.
