燃烧合成Mg_2Ni的影响因素

Study on the Effect Factor of Combustion Synthesizing Mg_2Ni

用XRD和SEM对Mg-Ni体系燃烧合成产物进行了研究。结果表明:Mg-Ni压坯预热至440℃以上均可热爆合成Mg2Ni,且预热速度越大产物越致密;过大的压坯密度,降低了体系的燃烧温度,影响Mg,Ni间的反应程度;而对于细小的Mg粒,由于较高的燃烧温度,导致合成产物出现严重的烧结现象;此外热爆合成产物在一定温度下适当的保温,有助于提高Mg2Ni的纯度。

The effect of some parameters in combustion synthesis on the products was studied by means of XRD and SEM. The results showed that Mg2Ni can be synthesized by the thermal explosion mode at over 440℃ of preheat temperature, and the larger the preheat rate, the more dense the combustion-synthesized product. Using too high dense green, the combustion temperature of the reaction was decreased gradually, which brought unsatisfied reaction between Mg and Ni. In contrast, the too fine Mg powder would lead a higher combustion temperature of the reaction, resulting in oversintering of the products. In addition, heating the product to a proper temperature and holding a proper time would be beneficial to improve the purity of Mg2Ni.