摘要
用ＸＰＳ、ＵＰＳ、ＩＳＳ、ＳＥＭ方法分别对Ｎｉ２４Ｚｒ７６和Ｎｉ３６Ｚｒ６４两种组份的非晶态合金在氧气压强为５×１０４Ｐａ，温度为２５０℃～３００℃的强氧化条件下，氧化前后表面的形貌及化学组成进行分析。结果表明，表面优先氧化Ｚｒ，并形成ＺｒＯ２物种。在非晶态Ｎｉ２４Ｚｒ２６合金中没有发现Ｎｉ的氧化，而Ｎｉ３６Ｚｒ６４组份的合金中Ｎｉ被氧化生成了ＮｉＯｘ（１＜ｘ＜１．５）。氧化后表面富Ｚｒ。将氧化后的Ｎｉ３６Ｚｒ６４合金进一步加热，部分氧化物可分解重新形成金属原子。表面组份的分离可能是ＺｒＯ２的形成及金属Ｚｒ原子对Ｚｉ原子的输运共同作用的结果，Ｎｉ原子的氧化过程可能是与Ｎｉ原子向体相迁移的过程相互竞争的。
The variations of surface morphology and chemical composition of Ni 24 Zr 76 and Ni 36 Zr 64 have been investigated before and after a drastic oxidation(in 5×10 4Pa oxygen gas and heated up to 250℃～300℃)by XPS,UPS,ISS and SEM.XPS results show that the zirconium on both of the two amorphous alloy surfaces has been completely oxidized to ZrO 2. The oxidation of Ni in amorphous Ni 24 Zr 76 alloy has not been observed,while a small amount of Ni has been oxidized to nickel oxides in Ni 36 Zr 64 .A heavy Zr enrichment has been observed on the surface upon oxidation of the alloys.It is shown that both the formation of zirconium oxides and a movement of Ni atoms through Zr atoms(but not ions) can be attributed to the surfce segration.It is also shown that there is a competition between the processes of Ni oxidation and Ni migration to the bulk.Heating the oxidized alloys to 500℃ can cause part of the oxides to dissociate,leaving oertain amounts of metal Zr or even Ni on the surface.
