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Las Vegas, NV|Mandalay Bay Resort and Casino
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Proving DRACO will deliver
The United States is now closer than it has been in over five decades to launching the first nuclear thermal rocket into space, thanks to DRACO—the Demonstration Rocket for Agile Cislunar Orbit.
A. M. Gadalla and N. A. L. Mansour
Nuclear Science and Engineering | Volume 90 | Number 3 | July 1985 | Pages 320-329
Technical Paper | doi.org/10.13182/NSE85-A17773
Articles are hosted by Taylor and Francis Online.
Equilibrium relationships in the uranium-tungsten-oxygen system have been established as a function of temperature at different oxygen pressures. Isobaric sections in air and oxygen and at oxygen partial pressures of 0.01 and 0.07 were constructed, using the thermobalance. Mixtures of U3O8 and WO3 pick up weight in air, forming UWO6, which exists over a wide range of compositions taking both uranium oxides and WO3 in solid solution. The compound WO3 takes a limited amount of uranium oxide in solid solution and U3O8 also dissolves a limited amount of W03. The miscibility gap between the solid solutions of UWO6-x and U3O8-y on the one hand and the solid solutions of UWO6-x and WO3-z on the other hand decreases by decreasing oxygen partial pressure and/or by increasing temperature. Each group of compatible solutions finally merges into a single phase deficient in oxygen. The two single phases exist over a wide range of compositions and melt over ranges of temperatures depending on the initial composition. Above a critical oxygen partial pressure (between 0.01 and 0.07 atm), solid solutions of UWO6-x and U3O8-y, as well as solid solutions of UWO6-x and WO3-z, melt partially with isothermal oxygen loss. Increasing the oxygen partial pressure increases the melting temperatures and produces eutectic liquids richer in oxygen.