(中南大學(xué) 粉末冶金國家重點實驗室，長沙 410083)
摘 要: 根據(jù)LiB化合物的六方結(jié)構(gòu)模型，計算了熱電池陽極材料Li-B合金隨B含量變化的理論密度曲線。采用阿基米德方法分別測量了含24%(摩爾分?jǐn)?shù))B的Li-B合金反應(yīng)完全并經(jīng)冷擠壓后的樣品和未經(jīng)第二次放熱反應(yīng)中間樣品的密度，綜合分析了以往不同研究者所測量的結(jié)果。結(jié)果表明，反應(yīng)充分并消除合金中孔隙后合金的實驗密度值與理論計算值一致，以往造成實驗偏差的主要原因是樣品中存在孔隙。中間樣品的密度與Li-B元素混合計算密度一致，它支持在第一次反應(yīng)和第二次反應(yīng)之間B熔化在Li中的觀點。
關(guān)鍵字: LiB合金； 陽極； 熱電池； 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
