The oxidation of uranium diboride in flowing air atmospheres
The oxidation of uranium diboride in flowing air atmospheres
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二硼化铀在流动空气中的氧化
DOI：
10.1016/j.jnucmat.2023.154417
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发表时间：
2023
影响因子：
3.1
通讯作者：
Mistarihi Q
中科院分区：
文献类型：
--
作者：
Mistarihi Q
采用热重分析（TGA）和差示扫描量热法（DSC）研究了碳硼热法合成的UB 2的空气氧化行为。从室温到1173 K的加热斜坡表明，碎片形式的样品在807 ± 6 K的温度下发生快速氧化，细粉材料在799 ± 5 K的温度下发生快速氧化。斜坡测试产生UB 2 O 6作为最终氧化产物。利用U-B-O体系的热力学模型，提出了过量氧化剂条件下氧化过程的反应途径，并预测了释放的热量。模型的预测与观察到的现象和通过DSC测量的值一致。
The air oxidation behaviour of UB2synthesized via the carbo/borothermic reaction has been investigated using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC), through heating ramp and isothermal studies. Heating ramps from room temperature up to 1173 K showed an on-set of rapid oxidation occurred at a temperature of 807 ± 6 K for samples in fragment form and 799 ± 5 K for finely powdered material. The ramp tests yielded UB2O6as the ultimate oxidation product. A thermodynamic model for the U-B-O system was used to propose a reaction pathway for the oxidation process in excess oxidiser condition and to predict the amount of heat released. The predictions of the model agreed with the observed phenomena and with the values measured via DSC.