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叙述了自悬浮定向流纳米金属粉末的制备原理 ,建立了在惰性气体介质中金属液滴表面蒸发形成悬浮微粒过程的数学模型 .描述了蒸发金属液滴表面层的热流动、物质迁移、热扩散、凝聚相初始核的形成、金属蒸气在粒子表面的凝聚、粒子相互凝聚等过程 ,考虑了物质迁移系数等动力学参数对温度的依赖关系 .预测了指定粉末尺寸分布下的最佳工艺条件
The principle of preparation of nano-metal powder from suspended directional flow was described and the mathematical model of the formation of suspended particles on the surface of metal droplets evaporating in inert gas was established.The thermal flow, material migration and thermal diffusion , The formation of the initial nucleus of condensed phase, the condensation of metal vapor on the particle surface and the mutual agglomeration of particles, the dependence of kinetic parameters such as mass transfer coefficient on temperature is taken into account.The optimum process conditions for the powder size distribution are predicted