铀在CO气氛中表面抗氧化性研究

STUDY ON THE SURFACE OXIDATION RESISTANCE OF URANIUM METAL IN THE ATMOSPHERE OF CARBON MONOXIDE

用Ｘ射线光电子能谱（ＸＰＳ）分析研究了铀金属的不同表层在ＣＯ气氛中２５、８０和２００℃时的表面反应。研究结果表明：ＣＯ与铀金属表层反应后，氧化物中氧含量减少，Ｏ／Ｕ比值随ＣＯ进气量的增加而减少；ＣＯ对铀金属表面的还原效果随温度和铀表层氧化程度的提高而加强；在ＣＯ气氛中，铀表面具有一定的抗氧化性。

The surface reactions of different layers on uranium metal with carbon monoxide at 25, 80 and 200 ℃ are studied by X ray photoelectron spectroscopy (XPS) The experimental results show that the carbon monoxide is adsopted on the surface oxide layer of uramiam and interacted each other. The content of oxygen in the surface oxide and O/U ratio are decreased with increasing the exposure of carbon monoxide to the surface layer. The effect of reduction on the metal surface is more obviously with a higher temperature and increasing of layer thickness. The investigation indicates the uranium metal has resistance to further oxidation in the atmosphere of carbon monoxde.