- Conference date: 8‐12 Jan 1995
- Location: Albuquerque, New Mexico (USA)
The thermal stability of (U0.7–Ta0.3)C0.99 pellets with nomial porosities of 10% and 20% was investigated. In this study, pellets were thermally treated at 1873 K and 2073 K in vacuum for 500 hours. Characterization before and after testing included chemical and phase compositions, pellet dimensions, porosities, and microstructure. The results showed that the pellets exposed to 1873 K exhibited little change. The pellets exposed to 2073 K did exhibit some changes. The specimens remained single phased but, slight changes in the stoichiometry occurred. That is, the carbon and uranium content was reduced. The most significant change occurred in the porosity of the specimens exposed to 2074 K. Post test analysis revealed that all of the specimens (the specimens with nominally 10% porosity and the specimens with nominally 20% porosity) thermally treated at 2073 K had a final porosity in the 7–8% range.
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