利用差示扫描量热仪,对纯Sn单个微米微滴凝固过冷度的尺寸效应进行了研究.用于测试的纯Sn微滴通过溶剂包裹重熔液淬法制备.由于在一系列连续的加热冷却过程中,测试的单个球形微滴的形状基本保持不变,使得研究微滴尺寸对过冷度的独立影响成为可能.结合热力学数据,采用经典形核理论进行计算,发现单个金属微滴凝固过冷度随微滴尺寸减小而增大,与实验结果一致. The size effect of solidification undercooling of a single microdroplet of pure Sn was investigated by differential scanning calorimetry.The pure Sn droplets for testing were prepared by quenching in a solvent-bound remelt bath, During the heating and cooling process, the shape of the single spherical droplet remained unchanged, which made it possible to study the independent influence of the droplet size on the subcooling degree.According to the thermodynamic data, the classical nucleation theory was used to calculate the single metal droplet The degree of solidification undercooling increases with the droplet size, which is consistent with the experimental results.