用卧滴法测定了液态Pb,Sb纯金属和Pb-Sb合金熔体的表面张力,其表面张力的温度系数均为负值。在同一温度下Pb-Sb熔体的表面张力值介于两纯金属值之间,其值随成分星非线性变化,且对“理想溶液”为负偏差。对液态二元共晶型合金,本文提出“液态类共晶原子团”的概念,并依此解释液态二元共晶型合金的表面张力现象。 The surface tension of liquid Pb, Sb pure metal and Pb-Sb alloy melt was measured by lying-on-drop method, and the temperature coefficients of surface tension were all negative. At the same temperature, the surface tension of the Pb-Sb melt is between two pure metals, its value varies nonlinearly with the composition of the star and negatively deviates from “ideal solution”. For liquid binary eutectic alloy, the concept of “liquid eutectic atomic group” is proposed in this paper, and the surface tension of liquid binary eutectic alloy is explained accordingly.