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基于铍(Be)冲击制粉颗粒的形貌特征,建立了一个描述Be粉颗粒尺寸分布的物理模型,该模型仅含一个物理意义明确的参数。模型中考虑了2种重要的内在影响机制:具有不同初始动能的颗粒在完成冲击后的存在状态应该遵从Maxwell-Boltzmann分布,即大颗粒具有高的能量,状态不稳定,在冲击过程中容易碎成小颗粒,这一影响可以用颗粒尺寸的负指数函数来描述;获得低表面能的倾向又使得颗粒尽可能具有大的体积,这一影响可以用颗粒尺寸的立方函数来描述。实际的颗粒尺寸分布是这2种影响竞争的结果。计算结果与实验数据符合得很好。
Based on the morphological characteristics of beryllium (Be) impact pulverized particles, a physical model describing the particle size distribution of Be powder was established, which contains only one parameter with a clear physical meaning. Two important intrinsic mechanisms are considered in the model: particles with different initial kinetic energies should follow the Maxwell-Boltzmann distribution after the impact is completed. That is, the large particles have high energy, the state is unstable and easily broken during the impact This effect can be described by a negative exponential function of particle size; the tendency to obtain low surface energy in turn allows the particles to have as large a volume as possible, an effect that can be described by a cubic function of particle size. The actual particle size distribution is the result of these two effects of competition. The calculated results are in good agreement with the experimental data.