(中南大学 粉末冶金国家重点实验室,长沙 410083)
摘 要: 根据LiB化合物的六方结构模型,计算了热电池阳极材料Li-B合金随B含量变化的理论密度曲线。采用阿基米德方法分别测量了含24%(摩尔分数)B的Li-B合金反应完全并经冷挤压后的样品和未经第二次放热反应中间样品的密度,综合分析了以往不同研究者所测量的结果。结果表明,反应充分并消除合金中孔隙后合金的实验密度值与理论计算值一致,以往造成实验偏差的主要原因是样品中存在孔隙。中间样品的密度与Li-B元素混合计算密度一致,它支持在第一次反应和第二次反应之间B熔化在Li中的观点。
关键字: LiB合金; 阳极; 热电池; 密度
of thermal battery
(State Key Laboratory for Powder Metallurgy, Central South University,
Changsha 410083, P.R.China)
Abstract:The theoretical density of Li-B alloy vs boron content was calculated according to a hexagonal structure model of LiB compound. For the 24%(mole fraction) B Li-B alloy,the densities of the specimen fully reacted and cold extruded and the specimen without second exothermic reaction were measured,respectively. Several experimental results of previous different researchers were discussed. It is shown that after full reaction and running out the porosity in the alloy,the experimental density of the alloy agree with that of theoretical calculation. The main reason that causes large deviations in density measurement is the porosity in the specimen. The density of the specimen without second exothermic reaction is almost the same as that of theoretical calculation according to the Li-B element mixture,it supports a view point that after first reaction and before the second reaction,the element B is solved into liquid Li.
Key words: Li-B alloy; anode; thermal battery; density