热电池阳极材料Li-B合金的密度分析

Investigation on density of Li-B alloy used for anode materials of thermal battery

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含量变化理论密度曲线,采用阿基米德方法分别测量了24％B(摩尔分数)Li-B合金反应完全并经冷挤压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测量的结果,研究表明,反应充分并消除合金中孔隙后其实验密度值与理论计算一致,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溶化在Li中的观点。

The theoretical density of Li-B alloy vs boron content curve has been calculated according to a hexagonal structure model of LiB compound. For the 24% B(mol fraction) Li-B alloy, densities of the specimen fully reactioned and cold extruded and the specimen without second exothermic reaction have been measured, respectively. Several experimental results of past different researchs have also been investigated. It is shown than after full reaction and runing out the porosity in the alloy, the experimental density of the alloy agrees with that of theoretical calculation. The main reason that causes large deviations in density measmonent 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 mixtrue, it supports a view point that the element B is solved into liquid Li after first reaction and before the second reaction.