储氢材料新合成方法的研究——置换-扩散法合成Mg_(2)Cu

A NEW METHOD FOR THE SYNTHESIS OF HYDROGEN STORAGE COMPOUNDS——REPLACEMENT-DIFFUSION METHOD FOR Mg2Cu

目前,国外普遍采用高温熔炼法制备Mg_(2)Cu,这种方法的优点是工艺比较简单,缺点是产物表面性能较差,吸、放氢速度较慢,且使用前必须经过粉碎。 本文提出一种新的合成Mg_(2)Cu的方法,即置换-扩散法,其要点是:在适当的非水溶剂中,用金属镁置换溶液中化合态的铜,俟铜接镀在镁上,然后在适当的温度下扩散,形成金属互化物Mg_(2)Cu。所得Mg_(2)Cu在适当条件下可以较好地吸、放氢。

A new method for the synthesis of Mg_(2)Cu is presented. The main feature of the method is using a suitable nonaqueous solution of cupric salt, such as CuCl_(2) in predried methylcyanide, to react with magnesium filings in an atmosphere of argon. The replaced copper is deposited on the surface of Mg. After heating the alloy at 500-580℃ under an atmosphere of argon for homogeneity, Mg_(2)Cu is obtained as a dark grey powder. The properties of this chemically synthetic intermetallic compound are essentially inden-tical with those reported in the literature.