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应用放射性同位素P~(32)并采用瞬时平面源毛细管法和毛细管-熔池法测定了磷在Fe-C(饱和)熔体中的扩散系数D值,并研究了毛细管管径、材料对D测定值的影响。实验结果表明,当直径为1—2毫米时,D值与管径无关。当管径大于2毫米时,则因对流逐渐增加而使所得扩散系数偏高。用高铝质和氧化铝毛细管比用石墨管所得扩散系数约大一个数量级。自射线照相的结果表明,磷在氧化铝管内的熔体中有表面扩散。在1223—1480℃间用石墨毛细管测定了磷在Fe-C(饱和)熔体中的扩散系数和激活能。
The diffusion coefficient D of phosphorus in Fe-C (saturated) melt was measured by using radioactive isotope P ~ (32) and capillary-bath method with the instantaneous planar source capillary method. The effects of capillary diameter, The effect of the measured value. Experimental results show that, when the diameter of 1-2 mm, D value and diameter has nothing to do. When the diameter is more than 2 mm, the diffusion coefficient will be higher due to the gradual increase of convection. The diffusion coefficient with graphite tubes is about an order of magnitude larger than with high-alumina and alumina capillaries. The results of the radiographs indicate that phosphorus is surface-diffused in the melt in the alumina tube. The diffusion coefficient and activation energy of phosphorus in Fe-C (saturated) melt were measured with graphite capillaries at 1223-1480 ℃.