Abstract
In order to clarify the reaction process of bulk MgB 2 phase, Differential Thermal Analysis (DTA), as the main measurement, was used to prepare bulk MgB 2 samples and monitor the sintering reaction process. Combined with microstructure observation by SEM and X-ray diffraction analysis, the formation process of MgB 2 phase was summarized. The reaction between Mg and B powders onsets before the melting point of pure Mg. The whole formation process of MgB 2 includes two different stages: (1) solid–solid reaction stage, in which Mg and B powder cannot react completely and the growth of MgB 2 grain is restricted by the pinning effects of pore; (2) solid–liquid reaction stage, in which the fused Mg promotes the reaction process and the regular hexagon bulky MgB 2 grain forms by means of solution-reprecipitation and growth.
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