High temperature behavior of simulated mixed nitrides

10th International School-Conference on Materials for Extreme Environment: Development, Production and Application

Baranov, V.G.^1 ; Lunev, A.V.^1 ; Mikhalchik, V.V.^1 ; Tenishev, A.V.^1 ; Shornikov, D.P.^1

National Research Nuclear University MEPhI, Moscow Engineering Physics Institute, Kashirskoe highway, 31, Moscow

115409, Russia^1

关键词: Exposure temperature;    Helium atmosphere;    High temperature;    High temperature behavior;    Lower temperatures;    Metal precipitates;    Mixed nitrides;    Uranium nitride;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/130/1/012022/pdf
DOI  :  10.1088/1757-899X/130/1/012022

来源: IOP

【 摘 要 】

Specimen of uranium-based mixed nitrides were synthesized by high-temperature nitriding of metal powder. To investigate thermal stability, samples were annealed at high temperature in a helium atmosphere. During these experiments, the effect of increasing the exposure temperature is studied. Raising the exposure temperature results in a multifold increase of mass loss. A comparison with data on pure uranium nitride shows that increasing the complexity of the nitride systems also results in higher mass loss. Later microscopic investigation of test samples revealed that metal precipitates may be found only on the surface of test samples. Electron probe micro-analysis indicates these precipitates to be uranium metal. Nevertheless, compared to pure uranium nitride, uranium-based mixed nitrides exhibit active evaporation at lower temperatures.