The Effects of Uranium and Oxygen Ratio on the Thermophysical Properties of Multicomponent Molten Uranium Alloys

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There are two main goals for this year’s research:1. Evaluate how well the ‘multiple-gas cooling method’ for heat capacity measurement performs at temperatures approaching 3000 K.2. Develop a new density measurement technique.Last year, I developed a heat capacity measurement method for high-temperature liquid materials called the ‘multiple-gas cooling method.’ Most of the experiments were performed on noble metals with low melting points during the method development phase. However, materials such as uranium and zirconium oxides that are closely related to nuclear safety have melting points close to 3000 K. Therefore, it is crucial to understand whether the ‘multiple-gas cooling method’ is capable of producing accurate results under much harsher conditions. The heat capacity of various transition metals such as Mo, Rh, and Ir was evaluated this year and confirmed the accuracy and reliability of the ‘multiple-gas cooling method’ even when used to measure materials with melting points near 3000 K.For density measurements, current methods used with aerodynamic levitation require one to estimate the sample's shape because it is partially blocked by the levitation nozzle. This raises concerns about the uncertainty of the estimated sample volume. The ‘drop-method’ developed in this work uses a splittable nozzle that drops the molten sample after levitation. The entire sample is visible when viewed from the side, and no estimations are necessary. The measured density of liquid platinum at its melting point was 19.17 g/cm3, which agrees well with literature values.