注入剂量为２×１０１６，５×１０１６，１×１０１７／ｃｍ２的Ｃｅ＋，使Ｎｉ２０Ｃｒ合金在１０００和１１００℃下的氧化速率显著降低．氧化膜致密、完整、粘附性好．利用离子探针分析技术测量了注Ｃｅ＋后，合金元素在合金表面及１１００℃形成的氧化膜内结合能差．注Ｃｅ＋后降低了合金表面Ｃｒ＋的结合能，有利于其向外扩散从而快速成膜；增大了膜内Ｃｒ＋和Ｎｉ＋的结合能，对这些离子在膜内的扩散起阻碍作用．因此，Ｃｅ＋的注入能改善合金的抗氧化性能．此外，在１０００℃循环氧化２７０次后，氧化膜部分剥落，Ｃｅ改善合金抗氧化性能仍十分显著．
Implantation of 2×1016,5×1016,1×1017Ce+/cm2 into Ni20Cr alloy can significantly decrease the oxidation rate at 1000 and 1100℃,and improve the adhesion of oxide scales.The changes of binding energy of alloy in elements in alloy surface after Ce implanting and in oxide scale formed at 1100℃ were measured using ion microperobe mass analyzer.The decrement of binding energy of Cr+on the alloy surface accelerate rapidly the formation of protective Cr2O3,however these of Cr+and Ni+ in the oxide scale increase,the outward diffusion of Cr3+and Ni2+through the scale are delayed.This seems to be the main reason for Ce implantation to decrease the oxidation rate of Ni20Cr at 1100℃.The oxide scales of Ce-implanted Ni20Cr alloy are dense,intact and well adhesive with the alloy.The oxide scales spall partially after 270 time during the cyclic oxidation at 1000℃,but the effect of Ce on the improvement of the oxide scale adherence is still obvious.Correspondent:LI Meishuan,assistant professor,(Institute of Corrosion and Protection of Metals,Chinese Academy of Sciences,Shenyang 110015)
参考文献
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