本文对合成反应中的各种因素(原料配比、粒度、反应温度、反应时间……)的影响进行考察。提出了一个825℃直接利用Cu,Ni粉还原扩散制备具有CaCu_5结构的LaNi_(5-x)Cu_x系列样品的方法。参考类似条件,方便地合成LaNi_4Zn,LaNi_(3.75)Al_(1.25)和(La_(0.8)Ti_(0.2))Ni_5等有关化合物。并研究了该系列化合物样品在各种介质中的稳定性及常温、常压下对合成氨反应的催化能力的差别。
An investigation was made of the technological process for synthesis of LaNi_(5-x)Cu_x (x=0—5) alloys by reduction-diffusion, especially detailed the proportion and grain size of starting materials, the temperature and time of reaction, etc. A favourable process was developed that the samples of LaNi_(5-x)Cu_x alloy series of the CaCu_5 structure may be prepared by direct synthesis of Cu and Ni powders under reduction-diffusion at 825℃. Referred to the similar process, the related intermetallic compounds LaNi_4Zn, LaNi_(3.75)Al_(1.25) and (La_(0.8)Ti_(0.2))Ni_5 were synthesized conveniently. The stability of LaNi_(5-x)Cu_x (x=0—5) alloy specimens immersed in acids, alkalies and other various media, as well as their catalytic activity in ammonia synthesis under normal temperature and pressure were also studied and compared individually.
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