【摘要】 利用程序升温分析方法研究了铀与氧气和二氧化碳的反应行为(TPO)。结果表明:在两种气氛中的反应过程均存在诱导期;当氧气分压处在16%～45%范围内时,铀的着火点温度为581～606K,中间产物为UO2,最终产物为U3O8;铀在CO2气氛中的着火点温度相对较高,在反应过程中,CO2解离产生CO气体;反应的表观活化能随气体浓度的升高而降低。更多还原

【Abstract】 The reaction of U（UO₂） with O₂ and CO₂ was studied by temperature programmed analytical technology. The experimental results show that there is an inducement-term in the reaction of U（UO₂） with O₂ and CO₂. The ignition temperature（T₀） varies between 581 and 606 K at different concentrations of oxygen（16%～45%）, the major intermediate product is UO₂ and the final product is U₃O₈. The T₀ of carbon dioxide is higher than that of O₂ and the CO₂ dissociates into CO during the reaction. The results also indicate that the apparent activation energy reduces with increase of gas concentration.更多还原