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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.
Berkan Çetinkaya, Hüseyin Tel, Ahmet Yaylı
Nuclear Technology | Volume 206 | Number 5 | May 2020 | Pages 717-727
Technical Paper | doi.org/10.1080/00295450.2019.1686939
Articles are hosted by Taylor and Francis Online.
(ThxCe1-x)O2 microspheres (x = 0.50, 0.75, and 0.95) prepared by sol-gel microsphere technique were compacted to pellets. The sintering kinetics, diffusion mechanism, and activation energy of the (ThxCe1-x)O2 pellets were investigated by dilatometry for 1100°C, 1200°C, and 1300°C. The rate controlling sintering method, one of the most sensitive methods, was chosen to investigate the sintering kinetics. The pellets were heated with a rate of 10°C/min and were held for 10 h at the above mentioned temperatures under isothermal conditions.
The activation energies for the (Th0.50Ce0.50)O2, (Th0.75Ce0.25)O2, and (Th0.95Ce0.05)O2 pellets were calculated as 305, 315, and 419 kJ·mol−1, respectively. In the experiments, green densities of the mixed-oxide pellets were determined as 45% to 47% of the theoretical density for all of the studied ratios. Sintering densities reached up to 94% of theoretical density after sintering at 1300°C. Scanning electron microscopy images of the pellets were taken.