【摘要】 通过高温氧化试验以及测量空洞平均直径和形核数量随氧化时间的变化,研究稀土对Al2O3／渗铝层界面空洞生长和抗高温氧化性能的影响,并与渗纯铝试样进行比较。结果表明,渗铝稀土试样空洞平均直径的增长速率仅是渗纯铝试样的1／2,空洞平均深度随平均直径的增长速率仅是渗纯铝试样的3／5,单位面积上的空洞数量少于渗纯铝试样。稀土可抑制界面空洞的形核和生长,阻止空洞向渗铝层纵深扩展,提高渗铝钢的抗高温氧化性能。探讨了稀土抑制空洞形核和生长的机理。更多还原

【Abstract】 The effects of rare earth (RE) elements on the growth of the voids along the interface between Al2O3 and aluminizing layer and the oxidation resistance of aluminized steel were investigated through measuring the variations of the average diameter and depth of interfacial voids with oxidation time, and compared with those of pure aluminized steel. The results show that, the growth rate of average diameter of voids in RE-added aluminized layer is only one half of that in pure aluminized layer and the variations rate of the average depth with the average diameter of interfacial voids is only three-fifths of that in pure aluminized layer, and the number of voids in unit area is less than that of pure aluminized layer too. RE can delay the formation and aggregation of the void and improves oxidation resistance of aluminized steel. The mechanism of the RE effect on the nucleation and the growth of interfacial voids was also discussed.更多还原