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提出了锂硼合金反应合成的物理模型,反应过程中有两次放热反应,第1次放热反应可以分成3个阶段,第1阶段是Li与B粒在界面(~330℃)的瞬时反应,此放热量与B粒的半径成反比关系.第2阶段是Li液通过B粒表面反应生成的LiB3向内扩散并与内核的B反应,此过程可用固体反应中的Johnston模型来描述.其反应速率常数与B粒的半径平方成反比.第3阶段是在425℃以上LiB3溶解到Li液体之中,但与此同时,第2次放热反应也开始进行.第2次放热反应通过Li-B化合物的形核和长大来完成,它可以分成形核孕育和爆发反应两个阶段.有足够形核数目时,产生爆发性反应.温度越低,产生爆发性反应所需时间越长.运用该模型解释了合成实验中出现的相关现象.
The physical model of lithium-boron alloy reaction synthesis is proposed. There are two exothermic reactions during the reaction. The first exothermic reaction can be divided into three stages. The first stage is the instantaneous reaction between Li and B particles at the interface (~ 330 ℃) Reaction, the heat release is inversely proportional to the radius of particle B. The second stage is the inward diffusion of LiB3 generated by the Li liquid through the surface reaction of B particles and the B reaction with the core, which can be described by the Johnston model in solid reaction. The reaction rate constant is inversely proportional to the square of the radius of B. In the third stage, LiB3 is dissolved in Li liquid at 425 ° C or above, but in the meantime, the second exothermic reaction is started, and the second exothermic reaction Through the nucleation and growth of Li-B compounds to complete, it can be divided into nuclear nucleation and eruption reaction of two stages.Efficient nucleation number, produce explosive reactions.Lower temperature, the time required to produce explosive reactions The longer the time, the model is used to explain the related phenomena in the synthesis experiment.