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

今年的研究有两个主要目标：1。评估用于热容测量的“多气体冷却方法”在接近3000 K的温度下的性能。2.开发新的密度测量技术。去年，我开发了一种高温液体材料的热容测量方法，称为“多气体冷却法”。大多数实验是在方法开发阶段对低熔点贵金属进行的。然而，与核安全密切相关的铀和锆氧化物等材料的熔点接近3000 K。因此，了解“多气体冷却方法”是否能够在更苛刻的条件下产生准确的结果至关重要。今年对Mo、Rh和Ir等各种过渡金属的热容进行了评估，并证实了“多气体冷却法”的准确性和可靠性，即使用于测量熔点接近3000 K的材料。对于密度测量，目前使用的空气动力悬浮方法需要估计样品的形状，因为它被悬浮喷嘴部分阻挡。这引起了对估计样本量的不确定性的关切。在这项工作中开发的“滴法”使用一个分裂喷嘴，下降悬浮后的熔融样品。当从侧面观察时，整个样品是可见的，并且不需要估计。测得液态铂在熔点时的密度为19.17 g/cm ~ 3，与文献值吻合较好。

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.